Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * nodeIndexscan.c
4 : * Routines to support indexed scans of relations
5 : *
6 : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/executor/nodeIndexscan.c
12 : *
13 : *-------------------------------------------------------------------------
14 : */
15 : /*
16 : * INTERFACE ROUTINES
17 : * ExecIndexScan scans a relation using an index
18 : * IndexNext retrieve next tuple using index
19 : * IndexNextWithReorder same, but recheck ORDER BY expressions
20 : * ExecInitIndexScan creates and initializes state info.
21 : * ExecReScanIndexScan rescans the indexed relation.
22 : * ExecEndIndexScan releases all storage.
23 : * ExecIndexMarkPos marks scan position.
24 : * ExecIndexRestrPos restores scan position.
25 : * ExecIndexScanEstimate estimates DSM space needed for parallel index scan
26 : * ExecIndexScanInitializeDSM initialize DSM for parallel indexscan
27 : * ExecIndexScanReInitializeDSM reinitialize DSM for fresh scan
28 : * ExecIndexScanInitializeWorker attach to DSM info in parallel worker
29 : */
30 : #include "postgres.h"
31 :
32 : #include "access/nbtree.h"
33 : #include "access/relscan.h"
34 : #include "access/tableam.h"
35 : #include "catalog/pg_am.h"
36 : #include "executor/executor.h"
37 : #include "executor/nodeIndexscan.h"
38 : #include "lib/pairingheap.h"
39 : #include "miscadmin.h"
40 : #include "nodes/nodeFuncs.h"
41 : #include "utils/array.h"
42 : #include "utils/datum.h"
43 : #include "utils/lsyscache.h"
44 : #include "utils/rel.h"
45 :
46 : /*
47 : * When an ordering operator is used, tuples fetched from the index that
48 : * need to be reordered are queued in a pairing heap, as ReorderTuples.
49 : */
50 : typedef struct
51 : {
52 : pairingheap_node ph_node;
53 : HeapTuple htup;
54 : Datum *orderbyvals;
55 : bool *orderbynulls;
56 : } ReorderTuple;
57 :
58 : static TupleTableSlot *IndexNext(IndexScanState *node);
59 : static TupleTableSlot *IndexNextWithReorder(IndexScanState *node);
60 : static void EvalOrderByExpressions(IndexScanState *node, ExprContext *econtext);
61 : static bool IndexRecheck(IndexScanState *node, TupleTableSlot *slot);
62 : static int cmp_orderbyvals(const Datum *adist, const bool *anulls,
63 : const Datum *bdist, const bool *bnulls,
64 : IndexScanState *node);
65 : static int reorderqueue_cmp(const pairingheap_node *a,
66 : const pairingheap_node *b, void *arg);
67 : static void reorderqueue_push(IndexScanState *node, TupleTableSlot *slot,
68 : Datum *orderbyvals, bool *orderbynulls);
69 : static HeapTuple reorderqueue_pop(IndexScanState *node);
70 :
71 :
72 : /* ----------------------------------------------------------------
73 : * IndexNext
74 : *
75 : * Retrieve a tuple from the IndexScan node's currentRelation
76 : * using the index specified in the IndexScanState information.
77 : * ----------------------------------------------------------------
78 : */
79 : static TupleTableSlot *
80 2231870 : IndexNext(IndexScanState *node)
81 : {
82 : EState *estate;
83 : ExprContext *econtext;
84 : ScanDirection direction;
85 : IndexScanDesc scandesc;
86 : TupleTableSlot *slot;
87 :
88 : /*
89 : * extract necessary information from index scan node
90 : */
91 2231870 : estate = node->ss.ps.state;
92 :
93 : /*
94 : * Determine which direction to scan the index in based on the plan's scan
95 : * direction and the current direction of execution.
96 : */
97 2231870 : direction = ScanDirectionCombine(estate->es_direction,
98 : ((IndexScan *) node->ss.ps.plan)->indexorderdir);
99 2231870 : scandesc = node->iss_ScanDesc;
100 2231870 : econtext = node->ss.ps.ps_ExprContext;
101 2231870 : slot = node->ss.ss_ScanTupleSlot;
102 :
103 2231870 : if (scandesc == NULL)
104 : {
105 : /*
106 : * We reach here if the index scan is not parallel, or if we're
107 : * serially executing an index scan that was planned to be parallel.
108 : */
109 152558 : scandesc = index_beginscan(node->ss.ss_currentRelation,
110 : node->iss_RelationDesc,
111 : estate->es_snapshot,
112 : &node->iss_Instrument,
113 : node->iss_NumScanKeys,
114 : node->iss_NumOrderByKeys);
115 :
116 152558 : node->iss_ScanDesc = scandesc;
117 :
118 : /*
119 : * If no run-time keys to calculate or they are ready, go ahead and
120 : * pass the scankeys to the index AM.
121 : */
122 152558 : if (node->iss_NumRuntimeKeys == 0 || node->iss_RuntimeKeysReady)
123 152558 : index_rescan(scandesc,
124 152558 : node->iss_ScanKeys, node->iss_NumScanKeys,
125 152558 : node->iss_OrderByKeys, node->iss_NumOrderByKeys);
126 : }
127 :
128 : /*
129 : * ok, now that we have what we need, fetch the next tuple.
130 : */
131 2234652 : while (index_getnext_slot(scandesc, direction, slot))
132 : {
133 1717220 : CHECK_FOR_INTERRUPTS();
134 :
135 : /*
136 : * If the index was lossy, we have to recheck the index quals using
137 : * the fetched tuple.
138 : */
139 1717220 : if (scandesc->xs_recheck)
140 : {
141 325960 : econtext->ecxt_scantuple = slot;
142 325960 : if (!ExecQualAndReset(node->indexqualorig, econtext))
143 : {
144 : /* Fails recheck, so drop it and loop back for another */
145 2782 : InstrCountFiltered2(node, 1);
146 2782 : continue;
147 : }
148 : }
149 :
150 1714438 : return slot;
151 : }
152 :
153 : /*
154 : * if we get here it means the index scan failed so we are at the end of
155 : * the scan..
156 : */
157 517428 : node->iss_ReachedEnd = true;
158 517428 : return ExecClearTuple(slot);
159 : }
160 :
161 : /* ----------------------------------------------------------------
162 : * IndexNextWithReorder
163 : *
164 : * Like IndexNext, but this version can also re-check ORDER BY
165 : * expressions, and reorder the tuples as necessary.
166 : * ----------------------------------------------------------------
167 : */
168 : static TupleTableSlot *
169 82662 : IndexNextWithReorder(IndexScanState *node)
170 : {
171 : EState *estate;
172 : ExprContext *econtext;
173 : IndexScanDesc scandesc;
174 : TupleTableSlot *slot;
175 82662 : ReorderTuple *topmost = NULL;
176 : bool was_exact;
177 : Datum *lastfetched_vals;
178 : bool *lastfetched_nulls;
179 : int cmp;
180 :
181 82662 : estate = node->ss.ps.state;
182 :
183 : /*
184 : * Only forward scan is supported with reordering. Note: we can get away
185 : * with just Asserting here because the system will not try to run the
186 : * plan backwards if ExecSupportsBackwardScan() says it won't work.
187 : * Currently, that is guaranteed because no index AMs support both
188 : * amcanorderbyop and amcanbackward; if any ever do,
189 : * ExecSupportsBackwardScan() will need to consider indexorderbys
190 : * explicitly.
191 : */
192 : Assert(!ScanDirectionIsBackward(((IndexScan *) node->ss.ps.plan)->indexorderdir));
193 : Assert(ScanDirectionIsForward(estate->es_direction));
194 :
195 82662 : scandesc = node->iss_ScanDesc;
196 82662 : econtext = node->ss.ps.ps_ExprContext;
197 82662 : slot = node->ss.ss_ScanTupleSlot;
198 :
199 82662 : if (scandesc == NULL)
200 : {
201 : /*
202 : * We reach here if the index scan is not parallel, or if we're
203 : * serially executing an index scan that was planned to be parallel.
204 : */
205 46 : scandesc = index_beginscan(node->ss.ss_currentRelation,
206 : node->iss_RelationDesc,
207 : estate->es_snapshot,
208 : &node->iss_Instrument,
209 : node->iss_NumScanKeys,
210 : node->iss_NumOrderByKeys);
211 :
212 46 : node->iss_ScanDesc = scandesc;
213 :
214 : /*
215 : * If no run-time keys to calculate or they are ready, go ahead and
216 : * pass the scankeys to the index AM.
217 : */
218 46 : if (node->iss_NumRuntimeKeys == 0 || node->iss_RuntimeKeysReady)
219 46 : index_rescan(scandesc,
220 46 : node->iss_ScanKeys, node->iss_NumScanKeys,
221 46 : node->iss_OrderByKeys, node->iss_NumOrderByKeys);
222 : }
223 :
224 : for (;;)
225 : {
226 87856 : CHECK_FOR_INTERRUPTS();
227 :
228 : /*
229 : * Check the reorder queue first. If the topmost tuple in the queue
230 : * has an ORDER BY value smaller than (or equal to) the value last
231 : * returned by the index, we can return it now.
232 : */
233 87856 : if (!pairingheap_is_empty(node->iss_ReorderQueue))
234 : {
235 10252 : topmost = (ReorderTuple *) pairingheap_first(node->iss_ReorderQueue);
236 :
237 20498 : if (node->iss_ReachedEnd ||
238 10246 : cmp_orderbyvals(topmost->orderbyvals,
239 10246 : topmost->orderbynulls,
240 10246 : scandesc->xs_orderbyvals,
241 10246 : scandesc->xs_orderbynulls,
242 : node) <= 0)
243 : {
244 : HeapTuple tuple;
245 :
246 5076 : tuple = reorderqueue_pop(node);
247 :
248 : /* Pass 'true', as the tuple in the queue is a palloc'd copy */
249 5076 : ExecForceStoreHeapTuple(tuple, slot, true);
250 5076 : return slot;
251 : }
252 : }
253 77604 : else if (node->iss_ReachedEnd)
254 : {
255 : /* Queue is empty, and no more tuples from index. We're done. */
256 18 : return ExecClearTuple(slot);
257 : }
258 :
259 : /*
260 : * Fetch next tuple from the index.
261 : */
262 82762 : next_indextuple:
263 86902 : if (!index_getnext_slot(scandesc, ForwardScanDirection, slot))
264 : {
265 : /*
266 : * No more tuples from the index. But we still need to drain any
267 : * remaining tuples from the queue before we're done.
268 : */
269 18 : node->iss_ReachedEnd = true;
270 18 : continue;
271 : }
272 :
273 : /*
274 : * If the index was lossy, we have to recheck the index quals and
275 : * ORDER BY expressions using the fetched tuple.
276 : */
277 86884 : if (scandesc->xs_recheck)
278 : {
279 9126 : econtext->ecxt_scantuple = slot;
280 9126 : if (!ExecQualAndReset(node->indexqualorig, econtext))
281 : {
282 : /* Fails recheck, so drop it and loop back for another */
283 4140 : InstrCountFiltered2(node, 1);
284 : /* allow this loop to be cancellable */
285 4140 : CHECK_FOR_INTERRUPTS();
286 4140 : goto next_indextuple;
287 : }
288 : }
289 :
290 82744 : if (scandesc->xs_recheckorderby)
291 : {
292 5300 : econtext->ecxt_scantuple = slot;
293 5300 : ResetExprContext(econtext);
294 5300 : EvalOrderByExpressions(node, econtext);
295 :
296 : /*
297 : * Was the ORDER BY value returned by the index accurate? The
298 : * recheck flag means that the index can return inaccurate values,
299 : * but then again, the value returned for any particular tuple
300 : * could also be exactly correct. Compare the value returned by
301 : * the index with the recalculated value. (If the value returned
302 : * by the index happened to be exact right, we can often avoid
303 : * pushing the tuple to the queue, just to pop it back out again.)
304 : */
305 5300 : cmp = cmp_orderbyvals(node->iss_OrderByValues,
306 5300 : node->iss_OrderByNulls,
307 5300 : scandesc->xs_orderbyvals,
308 5300 : scandesc->xs_orderbynulls,
309 : node);
310 5300 : if (cmp < 0)
311 0 : elog(ERROR, "index returned tuples in wrong order");
312 5300 : else if (cmp == 0)
313 130 : was_exact = true;
314 : else
315 5170 : was_exact = false;
316 5300 : lastfetched_vals = node->iss_OrderByValues;
317 5300 : lastfetched_nulls = node->iss_OrderByNulls;
318 : }
319 : else
320 : {
321 77444 : was_exact = true;
322 77444 : lastfetched_vals = scandesc->xs_orderbyvals;
323 77444 : lastfetched_nulls = scandesc->xs_orderbynulls;
324 : }
325 :
326 : /*
327 : * Can we return this tuple immediately, or does it need to be pushed
328 : * to the reorder queue? If the ORDER BY expression values returned
329 : * by the index were inaccurate, we can't return it yet, because the
330 : * next tuple from the index might need to come before this one. Also,
331 : * we can't return it yet if there are any smaller tuples in the queue
332 : * already.
333 : */
334 82832 : if (!was_exact || (topmost && cmp_orderbyvals(lastfetched_vals,
335 : lastfetched_nulls,
336 88 : topmost->orderbyvals,
337 88 : topmost->orderbynulls,
338 : node) > 0))
339 : {
340 : /* Put this tuple to the queue */
341 5176 : reorderqueue_push(node, slot, lastfetched_vals, lastfetched_nulls);
342 5176 : continue;
343 : }
344 : else
345 : {
346 : /* Can return this tuple immediately. */
347 77568 : return slot;
348 : }
349 : }
350 :
351 : /*
352 : * if we get here it means the index scan failed so we are at the end of
353 : * the scan..
354 : */
355 : return ExecClearTuple(slot);
356 : }
357 :
358 : /*
359 : * Calculate the expressions in the ORDER BY clause, based on the heap tuple.
360 : */
361 : static void
362 5300 : EvalOrderByExpressions(IndexScanState *node, ExprContext *econtext)
363 : {
364 : int i;
365 : ListCell *l;
366 : MemoryContext oldContext;
367 :
368 5300 : oldContext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
369 :
370 5300 : i = 0;
371 10600 : foreach(l, node->indexorderbyorig)
372 : {
373 5300 : ExprState *orderby = (ExprState *) lfirst(l);
374 :
375 10600 : node->iss_OrderByValues[i] = ExecEvalExpr(orderby,
376 : econtext,
377 5300 : &node->iss_OrderByNulls[i]);
378 5300 : i++;
379 : }
380 :
381 5300 : MemoryContextSwitchTo(oldContext);
382 5300 : }
383 :
384 : /*
385 : * IndexRecheck -- access method routine to recheck a tuple in EvalPlanQual
386 : */
387 : static bool
388 104 : IndexRecheck(IndexScanState *node, TupleTableSlot *slot)
389 : {
390 : ExprContext *econtext;
391 :
392 : /*
393 : * extract necessary information from index scan node
394 : */
395 104 : econtext = node->ss.ps.ps_ExprContext;
396 :
397 : /* Does the tuple meet the indexqual condition? */
398 104 : econtext->ecxt_scantuple = slot;
399 104 : return ExecQualAndReset(node->indexqualorig, econtext);
400 : }
401 :
402 :
403 : /*
404 : * Compare ORDER BY expression values.
405 : */
406 : static int
407 29228 : cmp_orderbyvals(const Datum *adist, const bool *anulls,
408 : const Datum *bdist, const bool *bnulls,
409 : IndexScanState *node)
410 : {
411 : int i;
412 : int result;
413 :
414 29416 : for (i = 0; i < node->iss_NumOrderByKeys; i++)
415 : {
416 29228 : SortSupport ssup = &node->iss_SortSupport[i];
417 :
418 : /*
419 : * Handle nulls. We only need to support NULLS LAST ordering, because
420 : * match_pathkeys_to_index() doesn't consider indexorderby
421 : * implementation otherwise.
422 : */
423 29228 : if (anulls[i] && !bnulls[i])
424 0 : return 1;
425 29228 : else if (!anulls[i] && bnulls[i])
426 0 : return -1;
427 29228 : else if (anulls[i] && bnulls[i])
428 0 : return 0;
429 :
430 29228 : result = ssup->comparator(adist[i], bdist[i], ssup);
431 29228 : if (result != 0)
432 29040 : return result;
433 : }
434 :
435 188 : return 0;
436 : }
437 :
438 : /*
439 : * Pairing heap provides getting topmost (greatest) element while KNN provides
440 : * ascending sort. That's why we invert the sort order.
441 : */
442 : static int
443 13594 : reorderqueue_cmp(const pairingheap_node *a, const pairingheap_node *b,
444 : void *arg)
445 : {
446 13594 : ReorderTuple *rta = (ReorderTuple *) a;
447 13594 : ReorderTuple *rtb = (ReorderTuple *) b;
448 13594 : IndexScanState *node = (IndexScanState *) arg;
449 :
450 : /* exchange argument order to invert the sort order */
451 27188 : return cmp_orderbyvals(rtb->orderbyvals, rtb->orderbynulls,
452 13594 : rta->orderbyvals, rta->orderbynulls,
453 : node);
454 : }
455 :
456 : /*
457 : * Helper function to push a tuple to the reorder queue.
458 : */
459 : static void
460 5176 : reorderqueue_push(IndexScanState *node, TupleTableSlot *slot,
461 : Datum *orderbyvals, bool *orderbynulls)
462 : {
463 5176 : IndexScanDesc scandesc = node->iss_ScanDesc;
464 5176 : EState *estate = node->ss.ps.state;
465 5176 : MemoryContext oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
466 : ReorderTuple *rt;
467 : int i;
468 :
469 5176 : rt = (ReorderTuple *) palloc(sizeof(ReorderTuple));
470 5176 : rt->htup = ExecCopySlotHeapTuple(slot);
471 5176 : rt->orderbyvals =
472 5176 : (Datum *) palloc(sizeof(Datum) * scandesc->numberOfOrderBys);
473 5176 : rt->orderbynulls =
474 5176 : (bool *) palloc(sizeof(bool) * scandesc->numberOfOrderBys);
475 10352 : for (i = 0; i < node->iss_NumOrderByKeys; i++)
476 : {
477 5176 : if (!orderbynulls[i])
478 5176 : rt->orderbyvals[i] = datumCopy(orderbyvals[i],
479 5176 : node->iss_OrderByTypByVals[i],
480 5176 : node->iss_OrderByTypLens[i]);
481 : else
482 0 : rt->orderbyvals[i] = (Datum) 0;
483 5176 : rt->orderbynulls[i] = orderbynulls[i];
484 : }
485 5176 : pairingheap_add(node->iss_ReorderQueue, &rt->ph_node);
486 :
487 5176 : MemoryContextSwitchTo(oldContext);
488 5176 : }
489 :
490 : /*
491 : * Helper function to pop the next tuple from the reorder queue.
492 : */
493 : static HeapTuple
494 5136 : reorderqueue_pop(IndexScanState *node)
495 : {
496 : HeapTuple result;
497 : ReorderTuple *topmost;
498 : int i;
499 :
500 5136 : topmost = (ReorderTuple *) pairingheap_remove_first(node->iss_ReorderQueue);
501 :
502 5136 : result = topmost->htup;
503 10272 : for (i = 0; i < node->iss_NumOrderByKeys; i++)
504 : {
505 5136 : if (!node->iss_OrderByTypByVals[i] && !topmost->orderbynulls[i])
506 0 : pfree(DatumGetPointer(topmost->orderbyvals[i]));
507 : }
508 5136 : pfree(topmost->orderbyvals);
509 5136 : pfree(topmost->orderbynulls);
510 5136 : pfree(topmost);
511 :
512 5136 : return result;
513 : }
514 :
515 :
516 : /* ----------------------------------------------------------------
517 : * ExecIndexScan(node)
518 : * ----------------------------------------------------------------
519 : */
520 : static TupleTableSlot *
521 2069272 : ExecIndexScan(PlanState *pstate)
522 : {
523 2069272 : IndexScanState *node = castNode(IndexScanState, pstate);
524 :
525 : /*
526 : * If we have runtime keys and they've not already been set up, do it now.
527 : */
528 2069272 : if (node->iss_NumRuntimeKeys != 0 && !node->iss_RuntimeKeysReady)
529 37996 : ExecReScan((PlanState *) node);
530 :
531 2069266 : if (node->iss_NumOrderByKeys > 0)
532 82662 : return ExecScan(&node->ss,
533 : (ExecScanAccessMtd) IndexNextWithReorder,
534 : (ExecScanRecheckMtd) IndexRecheck);
535 : else
536 1986604 : return ExecScan(&node->ss,
537 : (ExecScanAccessMtd) IndexNext,
538 : (ExecScanRecheckMtd) IndexRecheck);
539 : }
540 :
541 : /* ----------------------------------------------------------------
542 : * ExecReScanIndexScan(node)
543 : *
544 : * Recalculates the values of any scan keys whose value depends on
545 : * information known at runtime, then rescans the indexed relation.
546 : *
547 : * Updating the scan key was formerly done separately in
548 : * ExecUpdateIndexScanKeys. Integrating it into ReScan makes
549 : * rescans of indices and relations/general streams more uniform.
550 : * ----------------------------------------------------------------
551 : */
552 : void
553 526200 : ExecReScanIndexScan(IndexScanState *node)
554 : {
555 : /*
556 : * If we are doing runtime key calculations (ie, any of the index key
557 : * values weren't simple Consts), compute the new key values. But first,
558 : * reset the context so we don't leak memory as each outer tuple is
559 : * scanned. Note this assumes that we will recalculate *all* runtime keys
560 : * on each call.
561 : */
562 526200 : if (node->iss_NumRuntimeKeys != 0)
563 : {
564 514272 : ExprContext *econtext = node->iss_RuntimeContext;
565 :
566 514272 : ResetExprContext(econtext);
567 514272 : ExecIndexEvalRuntimeKeys(econtext,
568 : node->iss_RuntimeKeys,
569 : node->iss_NumRuntimeKeys);
570 : }
571 526194 : node->iss_RuntimeKeysReady = true;
572 :
573 : /* flush the reorder queue */
574 526194 : if (node->iss_ReorderQueue)
575 : {
576 : HeapTuple tuple;
577 :
578 126 : while (!pairingheap_is_empty(node->iss_ReorderQueue))
579 : {
580 60 : tuple = reorderqueue_pop(node);
581 60 : heap_freetuple(tuple);
582 : }
583 : }
584 :
585 : /* reset index scan */
586 526194 : if (node->iss_ScanDesc)
587 443538 : index_rescan(node->iss_ScanDesc,
588 443538 : node->iss_ScanKeys, node->iss_NumScanKeys,
589 443538 : node->iss_OrderByKeys, node->iss_NumOrderByKeys);
590 526194 : node->iss_ReachedEnd = false;
591 :
592 526194 : ExecScanReScan(&node->ss);
593 526194 : }
594 :
595 :
596 : /*
597 : * ExecIndexEvalRuntimeKeys
598 : * Evaluate any runtime key values, and update the scankeys.
599 : */
600 : void
601 740154 : ExecIndexEvalRuntimeKeys(ExprContext *econtext,
602 : IndexRuntimeKeyInfo *runtimeKeys, int numRuntimeKeys)
603 : {
604 : int j;
605 : MemoryContext oldContext;
606 :
607 : /* We want to keep the key values in per-tuple memory */
608 740154 : oldContext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
609 :
610 1559360 : for (j = 0; j < numRuntimeKeys; j++)
611 : {
612 819212 : ScanKey scan_key = runtimeKeys[j].scan_key;
613 819212 : ExprState *key_expr = runtimeKeys[j].key_expr;
614 : Datum scanvalue;
615 : bool isNull;
616 :
617 : /*
618 : * For each run-time key, extract the run-time expression and evaluate
619 : * it with respect to the current context. We then stick the result
620 : * into the proper scan key.
621 : *
622 : * Note: the result of the eval could be a pass-by-ref value that's
623 : * stored in some outer scan's tuple, not in
624 : * econtext->ecxt_per_tuple_memory. We assume that the outer tuple
625 : * will stay put throughout our scan. If this is wrong, we could copy
626 : * the result into our context explicitly, but I think that's not
627 : * necessary.
628 : *
629 : * It's also entirely possible that the result of the eval is a
630 : * toasted value. In this case we should forcibly detoast it, to
631 : * avoid repeat detoastings each time the value is examined by an
632 : * index support function.
633 : */
634 819212 : scanvalue = ExecEvalExpr(key_expr,
635 : econtext,
636 : &isNull);
637 819206 : if (isNull)
638 : {
639 1072 : scan_key->sk_argument = scanvalue;
640 1072 : scan_key->sk_flags |= SK_ISNULL;
641 : }
642 : else
643 : {
644 818134 : if (runtimeKeys[j].key_toastable)
645 69772 : scanvalue = PointerGetDatum(PG_DETOAST_DATUM(scanvalue));
646 818134 : scan_key->sk_argument = scanvalue;
647 818134 : scan_key->sk_flags &= ~SK_ISNULL;
648 : }
649 : }
650 :
651 740148 : MemoryContextSwitchTo(oldContext);
652 740148 : }
653 :
654 : /*
655 : * ExecIndexEvalArrayKeys
656 : * Evaluate any array key values, and set up to iterate through arrays.
657 : *
658 : * Returns true if there are array elements to consider; false means there
659 : * is at least one null or empty array, so no match is possible. On true
660 : * result, the scankeys are initialized with the first elements of the arrays.
661 : */
662 : bool
663 26 : ExecIndexEvalArrayKeys(ExprContext *econtext,
664 : IndexArrayKeyInfo *arrayKeys, int numArrayKeys)
665 : {
666 26 : bool result = true;
667 : int j;
668 : MemoryContext oldContext;
669 :
670 : /* We want to keep the arrays in per-tuple memory */
671 26 : oldContext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
672 :
673 52 : for (j = 0; j < numArrayKeys; j++)
674 : {
675 26 : ScanKey scan_key = arrayKeys[j].scan_key;
676 26 : ExprState *array_expr = arrayKeys[j].array_expr;
677 : Datum arraydatum;
678 : bool isNull;
679 : ArrayType *arrayval;
680 : int16 elmlen;
681 : bool elmbyval;
682 : char elmalign;
683 : int num_elems;
684 : Datum *elem_values;
685 : bool *elem_nulls;
686 :
687 : /*
688 : * Compute and deconstruct the array expression. (Notes in
689 : * ExecIndexEvalRuntimeKeys() apply here too.)
690 : */
691 26 : arraydatum = ExecEvalExpr(array_expr,
692 : econtext,
693 : &isNull);
694 26 : if (isNull)
695 : {
696 0 : result = false;
697 0 : break; /* no point in evaluating more */
698 : }
699 26 : arrayval = DatumGetArrayTypeP(arraydatum);
700 : /* We could cache this data, but not clear it's worth it */
701 26 : get_typlenbyvalalign(ARR_ELEMTYPE(arrayval),
702 : &elmlen, &elmbyval, &elmalign);
703 26 : deconstruct_array(arrayval,
704 : ARR_ELEMTYPE(arrayval),
705 : elmlen, elmbyval, elmalign,
706 : &elem_values, &elem_nulls, &num_elems);
707 26 : if (num_elems <= 0)
708 : {
709 0 : result = false;
710 0 : break; /* no point in evaluating more */
711 : }
712 :
713 : /*
714 : * Note: we expect the previous array data, if any, to be
715 : * automatically freed by resetting the per-tuple context; hence no
716 : * pfree's here.
717 : */
718 26 : arrayKeys[j].elem_values = elem_values;
719 26 : arrayKeys[j].elem_nulls = elem_nulls;
720 26 : arrayKeys[j].num_elems = num_elems;
721 26 : scan_key->sk_argument = elem_values[0];
722 26 : if (elem_nulls[0])
723 0 : scan_key->sk_flags |= SK_ISNULL;
724 : else
725 26 : scan_key->sk_flags &= ~SK_ISNULL;
726 26 : arrayKeys[j].next_elem = 1;
727 : }
728 :
729 26 : MemoryContextSwitchTo(oldContext);
730 :
731 26 : return result;
732 : }
733 :
734 : /*
735 : * ExecIndexAdvanceArrayKeys
736 : * Advance to the next set of array key values, if any.
737 : *
738 : * Returns true if there is another set of values to consider, false if not.
739 : * On true result, the scankeys are initialized with the next set of values.
740 : */
741 : bool
742 25428 : ExecIndexAdvanceArrayKeys(IndexArrayKeyInfo *arrayKeys, int numArrayKeys)
743 : {
744 25428 : bool found = false;
745 : int j;
746 :
747 : /*
748 : * Note we advance the rightmost array key most quickly, since it will
749 : * correspond to the lowest-order index column among the available
750 : * qualifications. This is hypothesized to result in better locality of
751 : * access in the index.
752 : */
753 25454 : for (j = numArrayKeys - 1; j >= 0; j--)
754 : {
755 52 : ScanKey scan_key = arrayKeys[j].scan_key;
756 52 : int next_elem = arrayKeys[j].next_elem;
757 52 : int num_elems = arrayKeys[j].num_elems;
758 52 : Datum *elem_values = arrayKeys[j].elem_values;
759 52 : bool *elem_nulls = arrayKeys[j].elem_nulls;
760 :
761 52 : if (next_elem >= num_elems)
762 : {
763 26 : next_elem = 0;
764 26 : found = false; /* need to advance next array key */
765 : }
766 : else
767 26 : found = true;
768 52 : scan_key->sk_argument = elem_values[next_elem];
769 52 : if (elem_nulls[next_elem])
770 0 : scan_key->sk_flags |= SK_ISNULL;
771 : else
772 52 : scan_key->sk_flags &= ~SK_ISNULL;
773 52 : arrayKeys[j].next_elem = next_elem + 1;
774 52 : if (found)
775 26 : break;
776 : }
777 :
778 25428 : return found;
779 : }
780 :
781 :
782 : /* ----------------------------------------------------------------
783 : * ExecEndIndexScan
784 : * ----------------------------------------------------------------
785 : */
786 : void
787 189764 : ExecEndIndexScan(IndexScanState *node)
788 : {
789 : Relation indexRelationDesc;
790 : IndexScanDesc indexScanDesc;
791 :
792 : /*
793 : * extract information from the node
794 : */
795 189764 : indexRelationDesc = node->iss_RelationDesc;
796 189764 : indexScanDesc = node->iss_ScanDesc;
797 :
798 : /*
799 : * When ending a parallel worker, copy the statistics gathered by the
800 : * worker back into shared memory so that it can be picked up by the main
801 : * process to report in EXPLAIN ANALYZE
802 : */
803 189764 : if (node->iss_SharedInfo != NULL && IsParallelWorker())
804 : {
805 : IndexScanInstrumentation *winstrument;
806 :
807 : Assert(ParallelWorkerNumber <= node->iss_SharedInfo->num_workers);
808 270 : winstrument = &node->iss_SharedInfo->winstrument[ParallelWorkerNumber];
809 :
810 : /*
811 : * We have to accumulate the stats rather than performing a memcpy.
812 : * When a Gather/GatherMerge node finishes it will perform planner
813 : * shutdown on the workers. On rescan it will spin up new workers
814 : * which will have a new IndexOnlyScanState and zeroed stats.
815 : */
816 270 : winstrument->nsearches += node->iss_Instrument.nsearches;
817 : }
818 :
819 : /*
820 : * close the index relation (no-op if we didn't open it)
821 : */
822 189764 : if (indexScanDesc)
823 151978 : index_endscan(indexScanDesc);
824 189764 : if (indexRelationDesc)
825 186492 : index_close(indexRelationDesc, NoLock);
826 189764 : }
827 :
828 : /* ----------------------------------------------------------------
829 : * ExecIndexMarkPos
830 : *
831 : * Note: we assume that no caller attempts to set a mark before having read
832 : * at least one tuple. Otherwise, iss_ScanDesc might still be NULL.
833 : * ----------------------------------------------------------------
834 : */
835 : void
836 6040 : ExecIndexMarkPos(IndexScanState *node)
837 : {
838 6040 : EState *estate = node->ss.ps.state;
839 6040 : EPQState *epqstate = estate->es_epq_active;
840 :
841 6040 : if (epqstate != NULL)
842 : {
843 : /*
844 : * We are inside an EvalPlanQual recheck. If a test tuple exists for
845 : * this relation, then we shouldn't access the index at all. We would
846 : * instead need to save, and later restore, the state of the
847 : * relsubs_done flag, so that re-fetching the test tuple is possible.
848 : * However, given the assumption that no caller sets a mark at the
849 : * start of the scan, we can only get here with relsubs_done[i]
850 : * already set, and so no state need be saved.
851 : */
852 2 : Index scanrelid = ((Scan *) node->ss.ps.plan)->scanrelid;
853 :
854 : Assert(scanrelid > 0);
855 2 : if (epqstate->relsubs_slot[scanrelid - 1] != NULL ||
856 0 : epqstate->relsubs_rowmark[scanrelid - 1] != NULL)
857 : {
858 : /* Verify the claim above */
859 2 : if (!epqstate->relsubs_done[scanrelid - 1])
860 0 : elog(ERROR, "unexpected ExecIndexMarkPos call in EPQ recheck");
861 2 : return;
862 : }
863 : }
864 :
865 6038 : index_markpos(node->iss_ScanDesc);
866 : }
867 :
868 : /* ----------------------------------------------------------------
869 : * ExecIndexRestrPos
870 : * ----------------------------------------------------------------
871 : */
872 : void
873 54018 : ExecIndexRestrPos(IndexScanState *node)
874 : {
875 54018 : EState *estate = node->ss.ps.state;
876 54018 : EPQState *epqstate = estate->es_epq_active;
877 :
878 54018 : if (estate->es_epq_active != NULL)
879 : {
880 : /* See comments in ExecIndexMarkPos */
881 0 : Index scanrelid = ((Scan *) node->ss.ps.plan)->scanrelid;
882 :
883 : Assert(scanrelid > 0);
884 0 : if (epqstate->relsubs_slot[scanrelid - 1] != NULL ||
885 0 : epqstate->relsubs_rowmark[scanrelid - 1] != NULL)
886 : {
887 : /* Verify the claim above */
888 0 : if (!epqstate->relsubs_done[scanrelid - 1])
889 0 : elog(ERROR, "unexpected ExecIndexRestrPos call in EPQ recheck");
890 0 : return;
891 : }
892 : }
893 :
894 54018 : index_restrpos(node->iss_ScanDesc);
895 : }
896 :
897 : /* ----------------------------------------------------------------
898 : * ExecInitIndexScan
899 : *
900 : * Initializes the index scan's state information, creates
901 : * scan keys, and opens the base and index relations.
902 : *
903 : * Note: index scans have 2 sets of state information because
904 : * we have to keep track of the base relation and the
905 : * index relation.
906 : * ----------------------------------------------------------------
907 : */
908 : IndexScanState *
909 190568 : ExecInitIndexScan(IndexScan *node, EState *estate, int eflags)
910 : {
911 : IndexScanState *indexstate;
912 : Relation currentRelation;
913 : LOCKMODE lockmode;
914 :
915 : /*
916 : * create state structure
917 : */
918 190568 : indexstate = makeNode(IndexScanState);
919 190568 : indexstate->ss.ps.plan = (Plan *) node;
920 190568 : indexstate->ss.ps.state = estate;
921 190568 : indexstate->ss.ps.ExecProcNode = ExecIndexScan;
922 :
923 : /*
924 : * Miscellaneous initialization
925 : *
926 : * create expression context for node
927 : */
928 190568 : ExecAssignExprContext(estate, &indexstate->ss.ps);
929 :
930 : /*
931 : * open the scan relation
932 : */
933 190568 : currentRelation = ExecOpenScanRelation(estate, node->scan.scanrelid, eflags);
934 :
935 190568 : indexstate->ss.ss_currentRelation = currentRelation;
936 190568 : indexstate->ss.ss_currentScanDesc = NULL; /* no heap scan here */
937 :
938 : /*
939 : * get the scan type from the relation descriptor.
940 : */
941 190568 : ExecInitScanTupleSlot(estate, &indexstate->ss,
942 : RelationGetDescr(currentRelation),
943 : table_slot_callbacks(currentRelation));
944 :
945 : /*
946 : * Initialize result type and projection.
947 : */
948 190568 : ExecInitResultTypeTL(&indexstate->ss.ps);
949 190568 : ExecAssignScanProjectionInfo(&indexstate->ss);
950 :
951 : /*
952 : * initialize child expressions
953 : *
954 : * Note: we don't initialize all of the indexqual expression, only the
955 : * sub-parts corresponding to runtime keys (see below). Likewise for
956 : * indexorderby, if any. But the indexqualorig expression is always
957 : * initialized even though it will only be used in some uncommon cases ---
958 : * would be nice to improve that. (Problem is that any SubPlans present
959 : * in the expression must be found now...)
960 : */
961 190568 : indexstate->ss.ps.qual =
962 190568 : ExecInitQual(node->scan.plan.qual, (PlanState *) indexstate);
963 190568 : indexstate->indexqualorig =
964 190568 : ExecInitQual(node->indexqualorig, (PlanState *) indexstate);
965 190568 : indexstate->indexorderbyorig =
966 190568 : ExecInitExprList(node->indexorderbyorig, (PlanState *) indexstate);
967 :
968 : /*
969 : * If we are just doing EXPLAIN (ie, aren't going to run the plan), stop
970 : * here. This allows an index-advisor plugin to EXPLAIN a plan containing
971 : * references to nonexistent indexes.
972 : */
973 190568 : if (eflags & EXEC_FLAG_EXPLAIN_ONLY)
974 3272 : return indexstate;
975 :
976 : /* Open the index relation. */
977 187296 : lockmode = exec_rt_fetch(node->scan.scanrelid, estate)->rellockmode;
978 187296 : indexstate->iss_RelationDesc = index_open(node->indexid, lockmode);
979 :
980 : /*
981 : * Initialize index-specific scan state
982 : */
983 187296 : indexstate->iss_RuntimeKeysReady = false;
984 187296 : indexstate->iss_RuntimeKeys = NULL;
985 187296 : indexstate->iss_NumRuntimeKeys = 0;
986 :
987 : /*
988 : * build the index scan keys from the index qualification
989 : */
990 187296 : ExecIndexBuildScanKeys((PlanState *) indexstate,
991 : indexstate->iss_RelationDesc,
992 : node->indexqual,
993 : false,
994 187296 : &indexstate->iss_ScanKeys,
995 : &indexstate->iss_NumScanKeys,
996 : &indexstate->iss_RuntimeKeys,
997 : &indexstate->iss_NumRuntimeKeys,
998 : NULL, /* no ArrayKeys */
999 : NULL);
1000 :
1001 : /*
1002 : * any ORDER BY exprs have to be turned into scankeys in the same way
1003 : */
1004 187296 : ExecIndexBuildScanKeys((PlanState *) indexstate,
1005 : indexstate->iss_RelationDesc,
1006 : node->indexorderby,
1007 : true,
1008 187296 : &indexstate->iss_OrderByKeys,
1009 : &indexstate->iss_NumOrderByKeys,
1010 : &indexstate->iss_RuntimeKeys,
1011 : &indexstate->iss_NumRuntimeKeys,
1012 : NULL, /* no ArrayKeys */
1013 : NULL);
1014 :
1015 : /* Initialize sort support, if we need to re-check ORDER BY exprs */
1016 187296 : if (indexstate->iss_NumOrderByKeys > 0)
1017 : {
1018 46 : int numOrderByKeys = indexstate->iss_NumOrderByKeys;
1019 : int i;
1020 : ListCell *lco;
1021 : ListCell *lcx;
1022 :
1023 : /*
1024 : * Prepare sort support, and look up the data type for each ORDER BY
1025 : * expression.
1026 : */
1027 : Assert(numOrderByKeys == list_length(node->indexorderbyops));
1028 : Assert(numOrderByKeys == list_length(node->indexorderbyorig));
1029 46 : indexstate->iss_SortSupport = (SortSupportData *)
1030 46 : palloc0(numOrderByKeys * sizeof(SortSupportData));
1031 46 : indexstate->iss_OrderByTypByVals = (bool *)
1032 46 : palloc(numOrderByKeys * sizeof(bool));
1033 46 : indexstate->iss_OrderByTypLens = (int16 *)
1034 46 : palloc(numOrderByKeys * sizeof(int16));
1035 46 : i = 0;
1036 92 : forboth(lco, node->indexorderbyops, lcx, node->indexorderbyorig)
1037 : {
1038 46 : Oid orderbyop = lfirst_oid(lco);
1039 46 : Node *orderbyexpr = (Node *) lfirst(lcx);
1040 46 : Oid orderbyType = exprType(orderbyexpr);
1041 46 : Oid orderbyColl = exprCollation(orderbyexpr);
1042 46 : SortSupport orderbysort = &indexstate->iss_SortSupport[i];
1043 :
1044 : /* Initialize sort support */
1045 46 : orderbysort->ssup_cxt = CurrentMemoryContext;
1046 46 : orderbysort->ssup_collation = orderbyColl;
1047 : /* See cmp_orderbyvals() comments on NULLS LAST */
1048 46 : orderbysort->ssup_nulls_first = false;
1049 : /* ssup_attno is unused here and elsewhere */
1050 46 : orderbysort->ssup_attno = 0;
1051 : /* No abbreviation */
1052 46 : orderbysort->abbreviate = false;
1053 46 : PrepareSortSupportFromOrderingOp(orderbyop, orderbysort);
1054 :
1055 46 : get_typlenbyval(orderbyType,
1056 46 : &indexstate->iss_OrderByTypLens[i],
1057 46 : &indexstate->iss_OrderByTypByVals[i]);
1058 46 : i++;
1059 : }
1060 :
1061 : /* allocate arrays to hold the re-calculated distances */
1062 46 : indexstate->iss_OrderByValues = (Datum *)
1063 46 : palloc(numOrderByKeys * sizeof(Datum));
1064 46 : indexstate->iss_OrderByNulls = (bool *)
1065 46 : palloc(numOrderByKeys * sizeof(bool));
1066 :
1067 : /* and initialize the reorder queue */
1068 46 : indexstate->iss_ReorderQueue = pairingheap_allocate(reorderqueue_cmp,
1069 : indexstate);
1070 : }
1071 :
1072 : /*
1073 : * If we have runtime keys, we need an ExprContext to evaluate them. The
1074 : * node's standard context won't do because we want to reset that context
1075 : * for every tuple. So, build another context just like the other one...
1076 : * -tgl 7/11/00
1077 : */
1078 187296 : if (indexstate->iss_NumRuntimeKeys != 0)
1079 : {
1080 104694 : ExprContext *stdecontext = indexstate->ss.ps.ps_ExprContext;
1081 :
1082 104694 : ExecAssignExprContext(estate, &indexstate->ss.ps);
1083 104694 : indexstate->iss_RuntimeContext = indexstate->ss.ps.ps_ExprContext;
1084 104694 : indexstate->ss.ps.ps_ExprContext = stdecontext;
1085 : }
1086 : else
1087 : {
1088 82602 : indexstate->iss_RuntimeContext = NULL;
1089 : }
1090 :
1091 : /*
1092 : * all done.
1093 : */
1094 187296 : return indexstate;
1095 : }
1096 :
1097 :
1098 : /*
1099 : * ExecIndexBuildScanKeys
1100 : * Build the index scan keys from the index qualification expressions
1101 : *
1102 : * The index quals are passed to the index AM in the form of a ScanKey array.
1103 : * This routine sets up the ScanKeys, fills in all constant fields of the
1104 : * ScanKeys, and prepares information about the keys that have non-constant
1105 : * comparison values. We divide index qual expressions into five types:
1106 : *
1107 : * 1. Simple operator with constant comparison value ("indexkey op constant").
1108 : * For these, we just fill in a ScanKey containing the constant value.
1109 : *
1110 : * 2. Simple operator with non-constant value ("indexkey op expression").
1111 : * For these, we create a ScanKey with everything filled in except the
1112 : * expression value, and set up an IndexRuntimeKeyInfo struct to drive
1113 : * evaluation of the expression at the right times.
1114 : *
1115 : * 3. RowCompareExpr ("(indexkey, indexkey, ...) op (expr, expr, ...)").
1116 : * For these, we create a header ScanKey plus a subsidiary ScanKey array,
1117 : * as specified in access/skey.h. The elements of the row comparison
1118 : * can have either constant or non-constant comparison values.
1119 : *
1120 : * 4. ScalarArrayOpExpr ("indexkey op ANY (array-expression)"). If the index
1121 : * supports amsearcharray, we handle these the same as simple operators,
1122 : * setting the SK_SEARCHARRAY flag to tell the AM to handle them. Otherwise,
1123 : * we create a ScanKey with everything filled in except the comparison value,
1124 : * and set up an IndexArrayKeyInfo struct to drive processing of the qual.
1125 : * (Note that if we use an IndexArrayKeyInfo struct, the array expression is
1126 : * always treated as requiring runtime evaluation, even if it's a constant.)
1127 : *
1128 : * 5. NullTest ("indexkey IS NULL/IS NOT NULL"). We just fill in the
1129 : * ScanKey properly.
1130 : *
1131 : * This code is also used to prepare ORDER BY expressions for amcanorderbyop
1132 : * indexes. The behavior is exactly the same, except that we have to look up
1133 : * the operator differently. Note that only cases 1 and 2 are currently
1134 : * possible for ORDER BY.
1135 : *
1136 : * Input params are:
1137 : *
1138 : * planstate: executor state node we are working for
1139 : * index: the index we are building scan keys for
1140 : * quals: indexquals (or indexorderbys) expressions
1141 : * isorderby: true if processing ORDER BY exprs, false if processing quals
1142 : * *runtimeKeys: ptr to pre-existing IndexRuntimeKeyInfos, or NULL if none
1143 : * *numRuntimeKeys: number of pre-existing runtime keys
1144 : *
1145 : * Output params are:
1146 : *
1147 : * *scanKeys: receives ptr to array of ScanKeys
1148 : * *numScanKeys: receives number of scankeys
1149 : * *runtimeKeys: receives ptr to array of IndexRuntimeKeyInfos, or NULL if none
1150 : * *numRuntimeKeys: receives number of runtime keys
1151 : * *arrayKeys: receives ptr to array of IndexArrayKeyInfos, or NULL if none
1152 : * *numArrayKeys: receives number of array keys
1153 : *
1154 : * Caller may pass NULL for arrayKeys and numArrayKeys to indicate that
1155 : * IndexArrayKeyInfos are not supported.
1156 : */
1157 : void
1158 425494 : ExecIndexBuildScanKeys(PlanState *planstate, Relation index,
1159 : List *quals, bool isorderby,
1160 : ScanKey *scanKeys, int *numScanKeys,
1161 : IndexRuntimeKeyInfo **runtimeKeys, int *numRuntimeKeys,
1162 : IndexArrayKeyInfo **arrayKeys, int *numArrayKeys)
1163 : {
1164 : ListCell *qual_cell;
1165 : ScanKey scan_keys;
1166 : IndexRuntimeKeyInfo *runtime_keys;
1167 : IndexArrayKeyInfo *array_keys;
1168 : int n_scan_keys;
1169 : int n_runtime_keys;
1170 : int max_runtime_keys;
1171 : int n_array_keys;
1172 : int j;
1173 :
1174 : /* Allocate array for ScanKey structs: one per qual */
1175 425494 : n_scan_keys = list_length(quals);
1176 425494 : scan_keys = (ScanKey) palloc(n_scan_keys * sizeof(ScanKeyData));
1177 :
1178 : /*
1179 : * runtime_keys array is dynamically resized as needed. We handle it this
1180 : * way so that the same runtime keys array can be shared between
1181 : * indexquals and indexorderbys, which will be processed in separate calls
1182 : * of this function. Caller must be sure to pass in NULL/0 for first
1183 : * call.
1184 : */
1185 425494 : runtime_keys = *runtimeKeys;
1186 425494 : n_runtime_keys = max_runtime_keys = *numRuntimeKeys;
1187 :
1188 : /* Allocate array_keys as large as it could possibly need to be */
1189 : array_keys = (IndexArrayKeyInfo *)
1190 425494 : palloc0(n_scan_keys * sizeof(IndexArrayKeyInfo));
1191 425494 : n_array_keys = 0;
1192 :
1193 : /*
1194 : * for each opclause in the given qual, convert the opclause into a single
1195 : * scan key
1196 : */
1197 425494 : j = 0;
1198 686058 : foreach(qual_cell, quals)
1199 : {
1200 260564 : Expr *clause = (Expr *) lfirst(qual_cell);
1201 260564 : ScanKey this_scan_key = &scan_keys[j++];
1202 : Oid opno; /* operator's OID */
1203 : RegProcedure opfuncid; /* operator proc id used in scan */
1204 : Oid opfamily; /* opfamily of index column */
1205 : int op_strategy; /* operator's strategy number */
1206 : Oid op_lefttype; /* operator's declared input types */
1207 : Oid op_righttype;
1208 : Expr *leftop; /* expr on lhs of operator */
1209 : Expr *rightop; /* expr on rhs ... */
1210 : AttrNumber varattno; /* att number used in scan */
1211 : int indnkeyatts;
1212 :
1213 260564 : indnkeyatts = IndexRelationGetNumberOfKeyAttributes(index);
1214 260564 : if (IsA(clause, OpExpr))
1215 : {
1216 : /* indexkey op const or indexkey op expression */
1217 258534 : int flags = 0;
1218 : Datum scanvalue;
1219 :
1220 258534 : opno = ((OpExpr *) clause)->opno;
1221 258534 : opfuncid = ((OpExpr *) clause)->opfuncid;
1222 :
1223 : /*
1224 : * leftop should be the index key Var, possibly relabeled
1225 : */
1226 258534 : leftop = (Expr *) get_leftop(clause);
1227 :
1228 258534 : if (leftop && IsA(leftop, RelabelType))
1229 0 : leftop = ((RelabelType *) leftop)->arg;
1230 :
1231 : Assert(leftop != NULL);
1232 :
1233 258534 : if (!(IsA(leftop, Var) &&
1234 258534 : ((Var *) leftop)->varno == INDEX_VAR))
1235 0 : elog(ERROR, "indexqual doesn't have key on left side");
1236 :
1237 258534 : varattno = ((Var *) leftop)->varattno;
1238 258534 : if (varattno < 1 || varattno > indnkeyatts)
1239 0 : elog(ERROR, "bogus index qualification");
1240 :
1241 : /*
1242 : * We have to look up the operator's strategy number. This
1243 : * provides a cross-check that the operator does match the index.
1244 : */
1245 258534 : opfamily = index->rd_opfamily[varattno - 1];
1246 :
1247 258534 : get_op_opfamily_properties(opno, opfamily, isorderby,
1248 : &op_strategy,
1249 : &op_lefttype,
1250 : &op_righttype);
1251 :
1252 258534 : if (isorderby)
1253 198 : flags |= SK_ORDER_BY;
1254 :
1255 : /*
1256 : * rightop is the constant or variable comparison value
1257 : */
1258 258534 : rightop = (Expr *) get_rightop(clause);
1259 :
1260 258534 : if (rightop && IsA(rightop, RelabelType))
1261 4662 : rightop = ((RelabelType *) rightop)->arg;
1262 :
1263 : Assert(rightop != NULL);
1264 :
1265 258534 : if (IsA(rightop, Const))
1266 : {
1267 : /* OK, simple constant comparison value */
1268 121514 : scanvalue = ((Const *) rightop)->constvalue;
1269 121514 : if (((Const *) rightop)->constisnull)
1270 0 : flags |= SK_ISNULL;
1271 : }
1272 : else
1273 : {
1274 : /* Need to treat this one as a runtime key */
1275 137020 : if (n_runtime_keys >= max_runtime_keys)
1276 : {
1277 114412 : if (max_runtime_keys == 0)
1278 : {
1279 114406 : max_runtime_keys = 8;
1280 : runtime_keys = (IndexRuntimeKeyInfo *)
1281 114406 : palloc(max_runtime_keys * sizeof(IndexRuntimeKeyInfo));
1282 : }
1283 : else
1284 : {
1285 6 : max_runtime_keys *= 2;
1286 : runtime_keys = (IndexRuntimeKeyInfo *)
1287 6 : repalloc(runtime_keys, max_runtime_keys * sizeof(IndexRuntimeKeyInfo));
1288 : }
1289 : }
1290 137020 : runtime_keys[n_runtime_keys].scan_key = this_scan_key;
1291 274040 : runtime_keys[n_runtime_keys].key_expr =
1292 137020 : ExecInitExpr(rightop, planstate);
1293 137020 : runtime_keys[n_runtime_keys].key_toastable =
1294 137020 : TypeIsToastable(op_righttype);
1295 137020 : n_runtime_keys++;
1296 137020 : scanvalue = (Datum) 0;
1297 : }
1298 :
1299 : /*
1300 : * initialize the scan key's fields appropriately
1301 : */
1302 258534 : ScanKeyEntryInitialize(this_scan_key,
1303 : flags,
1304 : varattno, /* attribute number to scan */
1305 : op_strategy, /* op's strategy */
1306 : op_righttype, /* strategy subtype */
1307 : ((OpExpr *) clause)->inputcollid, /* collation */
1308 : opfuncid, /* reg proc to use */
1309 : scanvalue); /* constant */
1310 : }
1311 2030 : else if (IsA(clause, RowCompareExpr))
1312 : {
1313 : /* (indexkey, indexkey, ...) op (expression, expression, ...) */
1314 66 : RowCompareExpr *rc = (RowCompareExpr *) clause;
1315 : ScanKey first_sub_key;
1316 : int n_sub_key;
1317 : ListCell *largs_cell;
1318 : ListCell *rargs_cell;
1319 : ListCell *opnos_cell;
1320 : ListCell *collids_cell;
1321 :
1322 : Assert(!isorderby);
1323 :
1324 : first_sub_key = (ScanKey)
1325 66 : palloc(list_length(rc->opnos) * sizeof(ScanKeyData));
1326 66 : n_sub_key = 0;
1327 :
1328 : /* Scan RowCompare columns and generate subsidiary ScanKey items */
1329 198 : forfour(largs_cell, rc->largs, rargs_cell, rc->rargs,
1330 : opnos_cell, rc->opnos, collids_cell, rc->inputcollids)
1331 : {
1332 132 : ScanKey this_sub_key = &first_sub_key[n_sub_key];
1333 132 : int flags = SK_ROW_MEMBER;
1334 : Datum scanvalue;
1335 : Oid inputcollation;
1336 :
1337 132 : leftop = (Expr *) lfirst(largs_cell);
1338 132 : rightop = (Expr *) lfirst(rargs_cell);
1339 132 : opno = lfirst_oid(opnos_cell);
1340 132 : inputcollation = lfirst_oid(collids_cell);
1341 :
1342 : /*
1343 : * leftop should be the index key Var, possibly relabeled
1344 : */
1345 132 : if (leftop && IsA(leftop, RelabelType))
1346 0 : leftop = ((RelabelType *) leftop)->arg;
1347 :
1348 : Assert(leftop != NULL);
1349 :
1350 132 : if (!(IsA(leftop, Var) &&
1351 132 : ((Var *) leftop)->varno == INDEX_VAR))
1352 0 : elog(ERROR, "indexqual doesn't have key on left side");
1353 :
1354 132 : varattno = ((Var *) leftop)->varattno;
1355 :
1356 : /*
1357 : * We have to look up the operator's associated support
1358 : * function
1359 : */
1360 132 : if (!index->rd_indam->amcanorder ||
1361 132 : varattno < 1 || varattno > indnkeyatts)
1362 0 : elog(ERROR, "bogus RowCompare index qualification");
1363 132 : opfamily = index->rd_opfamily[varattno - 1];
1364 :
1365 132 : get_op_opfamily_properties(opno, opfamily, isorderby,
1366 : &op_strategy,
1367 : &op_lefttype,
1368 : &op_righttype);
1369 :
1370 132 : if (op_strategy != rc->cmptype)
1371 0 : elog(ERROR, "RowCompare index qualification contains wrong operator");
1372 :
1373 132 : opfuncid = get_opfamily_proc(opfamily,
1374 : op_lefttype,
1375 : op_righttype,
1376 : BTORDER_PROC);
1377 132 : if (!RegProcedureIsValid(opfuncid))
1378 0 : elog(ERROR, "missing support function %d(%u,%u) in opfamily %u",
1379 : BTORDER_PROC, op_lefttype, op_righttype, opfamily);
1380 :
1381 : /*
1382 : * rightop is the constant or variable comparison value
1383 : */
1384 132 : if (rightop && IsA(rightop, RelabelType))
1385 0 : rightop = ((RelabelType *) rightop)->arg;
1386 :
1387 : Assert(rightop != NULL);
1388 :
1389 132 : if (IsA(rightop, Const))
1390 : {
1391 : /* OK, simple constant comparison value */
1392 132 : scanvalue = ((Const *) rightop)->constvalue;
1393 132 : if (((Const *) rightop)->constisnull)
1394 18 : flags |= SK_ISNULL;
1395 : }
1396 : else
1397 : {
1398 : /* Need to treat this one as a runtime key */
1399 0 : if (n_runtime_keys >= max_runtime_keys)
1400 : {
1401 0 : if (max_runtime_keys == 0)
1402 : {
1403 0 : max_runtime_keys = 8;
1404 : runtime_keys = (IndexRuntimeKeyInfo *)
1405 0 : palloc(max_runtime_keys * sizeof(IndexRuntimeKeyInfo));
1406 : }
1407 : else
1408 : {
1409 0 : max_runtime_keys *= 2;
1410 : runtime_keys = (IndexRuntimeKeyInfo *)
1411 0 : repalloc(runtime_keys, max_runtime_keys * sizeof(IndexRuntimeKeyInfo));
1412 : }
1413 : }
1414 0 : runtime_keys[n_runtime_keys].scan_key = this_sub_key;
1415 0 : runtime_keys[n_runtime_keys].key_expr =
1416 0 : ExecInitExpr(rightop, planstate);
1417 0 : runtime_keys[n_runtime_keys].key_toastable =
1418 0 : TypeIsToastable(op_righttype);
1419 0 : n_runtime_keys++;
1420 0 : scanvalue = (Datum) 0;
1421 : }
1422 :
1423 : /*
1424 : * initialize the subsidiary scan key's fields appropriately
1425 : */
1426 132 : ScanKeyEntryInitialize(this_sub_key,
1427 : flags,
1428 : varattno, /* attribute number */
1429 : op_strategy, /* op's strategy */
1430 : op_righttype, /* strategy subtype */
1431 : inputcollation, /* collation */
1432 : opfuncid, /* reg proc to use */
1433 : scanvalue); /* constant */
1434 132 : n_sub_key++;
1435 : }
1436 :
1437 : /* Mark the last subsidiary scankey correctly */
1438 66 : first_sub_key[n_sub_key - 1].sk_flags |= SK_ROW_END;
1439 :
1440 : /*
1441 : * We don't use ScanKeyEntryInitialize for the header because it
1442 : * isn't going to contain a valid sk_func pointer.
1443 : */
1444 660 : MemSet(this_scan_key, 0, sizeof(ScanKeyData));
1445 66 : this_scan_key->sk_flags = SK_ROW_HEADER;
1446 66 : this_scan_key->sk_attno = first_sub_key->sk_attno;
1447 66 : this_scan_key->sk_strategy = rc->cmptype;
1448 : /* sk_subtype, sk_collation, sk_func not used in a header */
1449 66 : this_scan_key->sk_argument = PointerGetDatum(first_sub_key);
1450 : }
1451 1964 : else if (IsA(clause, ScalarArrayOpExpr))
1452 : {
1453 : /* indexkey op ANY (array-expression) */
1454 1430 : ScalarArrayOpExpr *saop = (ScalarArrayOpExpr *) clause;
1455 1430 : int flags = 0;
1456 : Datum scanvalue;
1457 :
1458 : Assert(!isorderby);
1459 :
1460 : Assert(saop->useOr);
1461 1430 : opno = saop->opno;
1462 1430 : opfuncid = saop->opfuncid;
1463 :
1464 : /*
1465 : * leftop should be the index key Var, possibly relabeled
1466 : */
1467 1430 : leftop = (Expr *) linitial(saop->args);
1468 :
1469 1430 : if (leftop && IsA(leftop, RelabelType))
1470 0 : leftop = ((RelabelType *) leftop)->arg;
1471 :
1472 : Assert(leftop != NULL);
1473 :
1474 1430 : if (!(IsA(leftop, Var) &&
1475 1430 : ((Var *) leftop)->varno == INDEX_VAR))
1476 0 : elog(ERROR, "indexqual doesn't have key on left side");
1477 :
1478 1430 : varattno = ((Var *) leftop)->varattno;
1479 1430 : if (varattno < 1 || varattno > indnkeyatts)
1480 0 : elog(ERROR, "bogus index qualification");
1481 :
1482 : /*
1483 : * We have to look up the operator's strategy number. This
1484 : * provides a cross-check that the operator does match the index.
1485 : */
1486 1430 : opfamily = index->rd_opfamily[varattno - 1];
1487 :
1488 1430 : get_op_opfamily_properties(opno, opfamily, isorderby,
1489 : &op_strategy,
1490 : &op_lefttype,
1491 : &op_righttype);
1492 :
1493 : /*
1494 : * rightop is the constant or variable array value
1495 : */
1496 1430 : rightop = (Expr *) lsecond(saop->args);
1497 :
1498 1430 : if (rightop && IsA(rightop, RelabelType))
1499 0 : rightop = ((RelabelType *) rightop)->arg;
1500 :
1501 : Assert(rightop != NULL);
1502 :
1503 1430 : if (index->rd_indam->amsearcharray)
1504 : {
1505 : /* Index AM will handle this like a simple operator */
1506 1404 : flags |= SK_SEARCHARRAY;
1507 1404 : if (IsA(rightop, Const))
1508 : {
1509 : /* OK, simple constant comparison value */
1510 1344 : scanvalue = ((Const *) rightop)->constvalue;
1511 1344 : if (((Const *) rightop)->constisnull)
1512 0 : flags |= SK_ISNULL;
1513 : }
1514 : else
1515 : {
1516 : /* Need to treat this one as a runtime key */
1517 60 : if (n_runtime_keys >= max_runtime_keys)
1518 : {
1519 60 : if (max_runtime_keys == 0)
1520 : {
1521 60 : max_runtime_keys = 8;
1522 : runtime_keys = (IndexRuntimeKeyInfo *)
1523 60 : palloc(max_runtime_keys * sizeof(IndexRuntimeKeyInfo));
1524 : }
1525 : else
1526 : {
1527 0 : max_runtime_keys *= 2;
1528 : runtime_keys = (IndexRuntimeKeyInfo *)
1529 0 : repalloc(runtime_keys, max_runtime_keys * sizeof(IndexRuntimeKeyInfo));
1530 : }
1531 : }
1532 60 : runtime_keys[n_runtime_keys].scan_key = this_scan_key;
1533 120 : runtime_keys[n_runtime_keys].key_expr =
1534 60 : ExecInitExpr(rightop, planstate);
1535 :
1536 : /*
1537 : * Careful here: the runtime expression is not of
1538 : * op_righttype, but rather is an array of same; so
1539 : * TypeIsToastable() isn't helpful. However, we can
1540 : * assume that all array types are toastable.
1541 : */
1542 60 : runtime_keys[n_runtime_keys].key_toastable = true;
1543 60 : n_runtime_keys++;
1544 60 : scanvalue = (Datum) 0;
1545 : }
1546 : }
1547 : else
1548 : {
1549 : /* Executor has to expand the array value */
1550 26 : array_keys[n_array_keys].scan_key = this_scan_key;
1551 52 : array_keys[n_array_keys].array_expr =
1552 26 : ExecInitExpr(rightop, planstate);
1553 : /* the remaining fields were zeroed by palloc0 */
1554 26 : n_array_keys++;
1555 26 : scanvalue = (Datum) 0;
1556 : }
1557 :
1558 : /*
1559 : * initialize the scan key's fields appropriately
1560 : */
1561 1430 : ScanKeyEntryInitialize(this_scan_key,
1562 : flags,
1563 : varattno, /* attribute number to scan */
1564 : op_strategy, /* op's strategy */
1565 : op_righttype, /* strategy subtype */
1566 : saop->inputcollid, /* collation */
1567 : opfuncid, /* reg proc to use */
1568 : scanvalue); /* constant */
1569 : }
1570 534 : else if (IsA(clause, NullTest))
1571 : {
1572 : /* indexkey IS NULL or indexkey IS NOT NULL */
1573 534 : NullTest *ntest = (NullTest *) clause;
1574 : int flags;
1575 :
1576 : Assert(!isorderby);
1577 :
1578 : /*
1579 : * argument should be the index key Var, possibly relabeled
1580 : */
1581 534 : leftop = ntest->arg;
1582 :
1583 534 : if (leftop && IsA(leftop, RelabelType))
1584 0 : leftop = ((RelabelType *) leftop)->arg;
1585 :
1586 : Assert(leftop != NULL);
1587 :
1588 534 : if (!(IsA(leftop, Var) &&
1589 534 : ((Var *) leftop)->varno == INDEX_VAR))
1590 0 : elog(ERROR, "NullTest indexqual has wrong key");
1591 :
1592 534 : varattno = ((Var *) leftop)->varattno;
1593 :
1594 : /*
1595 : * initialize the scan key's fields appropriately
1596 : */
1597 534 : switch (ntest->nulltesttype)
1598 : {
1599 182 : case IS_NULL:
1600 182 : flags = SK_ISNULL | SK_SEARCHNULL;
1601 182 : break;
1602 352 : case IS_NOT_NULL:
1603 352 : flags = SK_ISNULL | SK_SEARCHNOTNULL;
1604 352 : break;
1605 0 : default:
1606 0 : elog(ERROR, "unrecognized nulltesttype: %d",
1607 : (int) ntest->nulltesttype);
1608 : flags = 0; /* keep compiler quiet */
1609 : break;
1610 : }
1611 :
1612 534 : ScanKeyEntryInitialize(this_scan_key,
1613 : flags,
1614 : varattno, /* attribute number to scan */
1615 : InvalidStrategy, /* no strategy */
1616 : InvalidOid, /* no strategy subtype */
1617 : InvalidOid, /* no collation */
1618 : InvalidOid, /* no reg proc for this */
1619 : (Datum) 0); /* constant */
1620 : }
1621 : else
1622 0 : elog(ERROR, "unsupported indexqual type: %d",
1623 : (int) nodeTag(clause));
1624 : }
1625 :
1626 : Assert(n_runtime_keys <= max_runtime_keys);
1627 :
1628 : /* Get rid of any unused arrays */
1629 425494 : if (n_array_keys == 0)
1630 : {
1631 425468 : pfree(array_keys);
1632 425468 : array_keys = NULL;
1633 : }
1634 :
1635 : /*
1636 : * Return info to our caller.
1637 : */
1638 425494 : *scanKeys = scan_keys;
1639 425494 : *numScanKeys = n_scan_keys;
1640 425494 : *runtimeKeys = runtime_keys;
1641 425494 : *numRuntimeKeys = n_runtime_keys;
1642 425494 : if (arrayKeys)
1643 : {
1644 22798 : *arrayKeys = array_keys;
1645 22798 : *numArrayKeys = n_array_keys;
1646 : }
1647 402696 : else if (n_array_keys != 0)
1648 0 : elog(ERROR, "ScalarArrayOpExpr index qual found where not allowed");
1649 425494 : }
1650 :
1651 : /* ----------------------------------------------------------------
1652 : * Parallel Scan Support
1653 : * ----------------------------------------------------------------
1654 : */
1655 :
1656 : /* ----------------------------------------------------------------
1657 : * ExecIndexScanEstimate
1658 : *
1659 : * Compute the amount of space we'll need in the parallel
1660 : * query DSM, and inform pcxt->estimator about our needs.
1661 : * ----------------------------------------------------------------
1662 : */
1663 : void
1664 294 : ExecIndexScanEstimate(IndexScanState *node,
1665 : ParallelContext *pcxt)
1666 : {
1667 294 : EState *estate = node->ss.ps.state;
1668 294 : bool instrument = node->ss.ps.instrument != NULL;
1669 294 : bool parallel_aware = node->ss.ps.plan->parallel_aware;
1670 :
1671 294 : if (!instrument && !parallel_aware)
1672 : {
1673 : /* No DSM required by the scan */
1674 6 : return;
1675 : }
1676 :
1677 288 : node->iss_PscanLen = index_parallelscan_estimate(node->iss_RelationDesc,
1678 : node->iss_NumScanKeys,
1679 : node->iss_NumOrderByKeys,
1680 : estate->es_snapshot,
1681 : instrument, parallel_aware,
1682 : pcxt->nworkers);
1683 288 : shm_toc_estimate_chunk(&pcxt->estimator, node->iss_PscanLen);
1684 288 : shm_toc_estimate_keys(&pcxt->estimator, 1);
1685 : }
1686 :
1687 : /* ----------------------------------------------------------------
1688 : * ExecIndexScanInitializeDSM
1689 : *
1690 : * Set up a parallel index scan descriptor.
1691 : * ----------------------------------------------------------------
1692 : */
1693 : void
1694 294 : ExecIndexScanInitializeDSM(IndexScanState *node,
1695 : ParallelContext *pcxt)
1696 : {
1697 294 : EState *estate = node->ss.ps.state;
1698 : ParallelIndexScanDesc piscan;
1699 294 : bool instrument = node->ss.ps.instrument != NULL;
1700 294 : bool parallel_aware = node->ss.ps.plan->parallel_aware;
1701 :
1702 294 : if (!instrument && !parallel_aware)
1703 : {
1704 : /* No DSM required by the scan */
1705 6 : return;
1706 : }
1707 :
1708 288 : piscan = shm_toc_allocate(pcxt->toc, node->iss_PscanLen);
1709 288 : index_parallelscan_initialize(node->ss.ss_currentRelation,
1710 : node->iss_RelationDesc,
1711 : estate->es_snapshot,
1712 : instrument, parallel_aware, pcxt->nworkers,
1713 : &node->iss_SharedInfo, piscan);
1714 288 : shm_toc_insert(pcxt->toc, node->ss.ps.plan->plan_node_id, piscan);
1715 :
1716 288 : if (!parallel_aware)
1717 : {
1718 : /* Only here to initialize SharedInfo in DSM */
1719 270 : return;
1720 : }
1721 :
1722 18 : node->iss_ScanDesc =
1723 18 : index_beginscan_parallel(node->ss.ss_currentRelation,
1724 : node->iss_RelationDesc,
1725 : &node->iss_Instrument,
1726 : node->iss_NumScanKeys,
1727 : node->iss_NumOrderByKeys,
1728 : piscan);
1729 :
1730 : /*
1731 : * If no run-time keys to calculate or they are ready, go ahead and pass
1732 : * the scankeys to the index AM.
1733 : */
1734 18 : if (node->iss_NumRuntimeKeys == 0 || node->iss_RuntimeKeysReady)
1735 12 : index_rescan(node->iss_ScanDesc,
1736 12 : node->iss_ScanKeys, node->iss_NumScanKeys,
1737 12 : node->iss_OrderByKeys, node->iss_NumOrderByKeys);
1738 : }
1739 :
1740 : /* ----------------------------------------------------------------
1741 : * ExecIndexScanReInitializeDSM
1742 : *
1743 : * Reset shared state before beginning a fresh scan.
1744 : * ----------------------------------------------------------------
1745 : */
1746 : void
1747 12 : ExecIndexScanReInitializeDSM(IndexScanState *node,
1748 : ParallelContext *pcxt)
1749 : {
1750 : Assert(node->ss.ps.plan->parallel_aware);
1751 12 : index_parallelrescan(node->iss_ScanDesc);
1752 12 : }
1753 :
1754 : /* ----------------------------------------------------------------
1755 : * ExecIndexScanInitializeWorker
1756 : *
1757 : * Copy relevant information from TOC into planstate.
1758 : * ----------------------------------------------------------------
1759 : */
1760 : void
1761 396 : ExecIndexScanInitializeWorker(IndexScanState *node,
1762 : ParallelWorkerContext *pwcxt)
1763 : {
1764 : ParallelIndexScanDesc piscan;
1765 396 : bool instrument = node->ss.ps.instrument != NULL;
1766 396 : bool parallel_aware = node->ss.ps.plan->parallel_aware;
1767 :
1768 396 : if (!instrument && !parallel_aware)
1769 : {
1770 : /* No DSM required by the scan */
1771 6 : return;
1772 : }
1773 :
1774 390 : piscan = shm_toc_lookup(pwcxt->toc, node->ss.ps.plan->plan_node_id, false);
1775 :
1776 390 : if (instrument)
1777 270 : node->iss_SharedInfo = (SharedIndexScanInstrumentation *)
1778 270 : OffsetToPointer(piscan, piscan->ps_offset_ins);
1779 :
1780 390 : if (!parallel_aware)
1781 : {
1782 : /* Only here to set up worker node's SharedInfo */
1783 270 : return;
1784 : }
1785 :
1786 120 : node->iss_ScanDesc =
1787 120 : index_beginscan_parallel(node->ss.ss_currentRelation,
1788 : node->iss_RelationDesc,
1789 : &node->iss_Instrument,
1790 : node->iss_NumScanKeys,
1791 : node->iss_NumOrderByKeys,
1792 : piscan);
1793 :
1794 : /*
1795 : * If no run-time keys to calculate or they are ready, go ahead and pass
1796 : * the scankeys to the index AM.
1797 : */
1798 120 : if (node->iss_NumRuntimeKeys == 0 || node->iss_RuntimeKeysReady)
1799 96 : index_rescan(node->iss_ScanDesc,
1800 96 : node->iss_ScanKeys, node->iss_NumScanKeys,
1801 96 : node->iss_OrderByKeys, node->iss_NumOrderByKeys);
1802 : }
1803 :
1804 : /* ----------------------------------------------------------------
1805 : * ExecIndexScanRetrieveInstrumentation
1806 : *
1807 : * Transfer index scan statistics from DSM to private memory.
1808 : * ----------------------------------------------------------------
1809 : */
1810 : void
1811 270 : ExecIndexScanRetrieveInstrumentation(IndexScanState *node)
1812 : {
1813 270 : SharedIndexScanInstrumentation *SharedInfo = node->iss_SharedInfo;
1814 : size_t size;
1815 :
1816 270 : if (SharedInfo == NULL)
1817 0 : return;
1818 :
1819 : /* Create a copy of SharedInfo in backend-local memory */
1820 270 : size = offsetof(SharedIndexScanInstrumentation, winstrument) +
1821 270 : SharedInfo->num_workers * sizeof(IndexScanInstrumentation);
1822 270 : node->iss_SharedInfo = palloc(size);
1823 270 : memcpy(node->iss_SharedInfo, SharedInfo, size);
1824 : }
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