Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * orderedsetaggs.c
4 : * Ordered-set aggregate functions.
5 : *
6 : * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/utils/adt/orderedsetaggs.c
12 : *
13 : *-------------------------------------------------------------------------
14 : */
15 : #include "postgres.h"
16 :
17 : #include <math.h>
18 :
19 : #include "catalog/pg_aggregate.h"
20 : #include "catalog/pg_operator.h"
21 : #include "catalog/pg_type.h"
22 : #include "executor/executor.h"
23 : #include "miscadmin.h"
24 : #include "nodes/nodeFuncs.h"
25 : #include "optimizer/optimizer.h"
26 : #include "utils/array.h"
27 : #include "utils/builtins.h"
28 : #include "utils/lsyscache.h"
29 : #include "utils/memutils.h"
30 : #include "utils/timestamp.h"
31 : #include "utils/tuplesort.h"
32 :
33 :
34 : /*
35 : * Generic support for ordered-set aggregates
36 : *
37 : * The state for an ordered-set aggregate is divided into a per-group struct
38 : * (which is the internal-type transition state datum returned to nodeAgg.c)
39 : * and a per-query struct, which contains data and sub-objects that we can
40 : * create just once per query because they will not change across groups.
41 : * The per-query struct and subsidiary data live in the executor's per-query
42 : * memory context, and go away implicitly at ExecutorEnd().
43 : *
44 : * These structs are set up during the first call of the transition function.
45 : * Because we allow nodeAgg.c to merge ordered-set aggregates (but not
46 : * hypothetical aggregates) with identical inputs and transition functions,
47 : * this info must not depend on the particular aggregate (ie, particular
48 : * final-function), nor on the direct argument(s) of the aggregate.
49 : */
50 :
51 : typedef struct OSAPerQueryState
52 : {
53 : /* Representative Aggref for this aggregate: */
54 : Aggref *aggref;
55 : /* Memory context containing this struct and other per-query data: */
56 : MemoryContext qcontext;
57 : /* Context for expression evaluation */
58 : ExprContext *econtext;
59 : /* Do we expect multiple final-function calls within one group? */
60 : bool rescan_needed;
61 :
62 : /* These fields are used only when accumulating tuples: */
63 :
64 : /* Tuple descriptor for tuples inserted into sortstate: */
65 : TupleDesc tupdesc;
66 : /* Tuple slot we can use for inserting/extracting tuples: */
67 : TupleTableSlot *tupslot;
68 : /* Per-sort-column sorting information */
69 : int numSortCols;
70 : AttrNumber *sortColIdx;
71 : Oid *sortOperators;
72 : Oid *eqOperators;
73 : Oid *sortCollations;
74 : bool *sortNullsFirsts;
75 : /* Equality operator call info, created only if needed: */
76 : ExprState *compareTuple;
77 :
78 : /* These fields are used only when accumulating datums: */
79 :
80 : /* Info about datatype of datums being sorted: */
81 : Oid sortColType;
82 : int16 typLen;
83 : bool typByVal;
84 : char typAlign;
85 : /* Info about sort ordering: */
86 : Oid sortOperator;
87 : Oid eqOperator;
88 : Oid sortCollation;
89 : bool sortNullsFirst;
90 : /* Equality operator call info, created only if needed: */
91 : FmgrInfo equalfn;
92 : } OSAPerQueryState;
93 :
94 : typedef struct OSAPerGroupState
95 : {
96 : /* Link to the per-query state for this aggregate: */
97 : OSAPerQueryState *qstate;
98 : /* Memory context containing per-group data: */
99 : MemoryContext gcontext;
100 : /* Sort object we're accumulating data in: */
101 : Tuplesortstate *sortstate;
102 : /* Number of normal rows inserted into sortstate: */
103 : int64 number_of_rows;
104 : /* Have we already done tuplesort_performsort? */
105 : bool sort_done;
106 : } OSAPerGroupState;
107 :
108 : static void ordered_set_shutdown(Datum arg);
109 :
110 :
111 : /*
112 : * Set up working state for an ordered-set aggregate
113 : */
114 : static OSAPerGroupState *
115 660 : ordered_set_startup(FunctionCallInfo fcinfo, bool use_tuples)
116 : {
117 : OSAPerGroupState *osastate;
118 : OSAPerQueryState *qstate;
119 : MemoryContext gcontext;
120 : MemoryContext oldcontext;
121 : int tuplesortopt;
122 :
123 : /*
124 : * Check we're called as aggregate (and not a window function), and get
125 : * the Agg node's group-lifespan context (which might change from group to
126 : * group, so we shouldn't cache it in the per-query state).
127 : */
128 660 : if (AggCheckCallContext(fcinfo, &gcontext) != AGG_CONTEXT_AGGREGATE)
129 0 : elog(ERROR, "ordered-set aggregate called in non-aggregate context");
130 :
131 : /*
132 : * We keep a link to the per-query state in fn_extra; if it's not there,
133 : * create it, and do the per-query setup we need.
134 : */
135 660 : qstate = (OSAPerQueryState *) fcinfo->flinfo->fn_extra;
136 660 : if (qstate == NULL)
137 : {
138 : Aggref *aggref;
139 : MemoryContext qcontext;
140 : List *sortlist;
141 : int numSortCols;
142 :
143 : /* Get the Aggref so we can examine aggregate's arguments */
144 246 : aggref = AggGetAggref(fcinfo);
145 246 : if (!aggref)
146 0 : elog(ERROR, "ordered-set aggregate called in non-aggregate context");
147 246 : if (!AGGKIND_IS_ORDERED_SET(aggref->aggkind))
148 0 : elog(ERROR, "ordered-set aggregate support function called for non-ordered-set aggregate");
149 :
150 : /*
151 : * Prepare per-query structures in the fn_mcxt, which we assume is the
152 : * executor's per-query context; in any case it's the right place to
153 : * keep anything found via fn_extra.
154 : */
155 246 : qcontext = fcinfo->flinfo->fn_mcxt;
156 246 : oldcontext = MemoryContextSwitchTo(qcontext);
157 :
158 246 : qstate = (OSAPerQueryState *) palloc0(sizeof(OSAPerQueryState));
159 246 : qstate->aggref = aggref;
160 246 : qstate->qcontext = qcontext;
161 :
162 : /* We need to support rescans if the trans state is shared */
163 246 : qstate->rescan_needed = AggStateIsShared(fcinfo);
164 :
165 : /* Extract the sort information */
166 246 : sortlist = aggref->aggorder;
167 246 : numSortCols = list_length(sortlist);
168 :
169 246 : if (use_tuples)
170 : {
171 100 : bool ishypothetical = (aggref->aggkind == AGGKIND_HYPOTHETICAL);
172 : ListCell *lc;
173 : int i;
174 :
175 100 : if (ishypothetical)
176 100 : numSortCols++; /* make space for flag column */
177 100 : qstate->numSortCols = numSortCols;
178 100 : qstate->sortColIdx = (AttrNumber *) palloc(numSortCols * sizeof(AttrNumber));
179 100 : qstate->sortOperators = (Oid *) palloc(numSortCols * sizeof(Oid));
180 100 : qstate->eqOperators = (Oid *) palloc(numSortCols * sizeof(Oid));
181 100 : qstate->sortCollations = (Oid *) palloc(numSortCols * sizeof(Oid));
182 100 : qstate->sortNullsFirsts = (bool *) palloc(numSortCols * sizeof(bool));
183 :
184 100 : i = 0;
185 250 : foreach(lc, sortlist)
186 : {
187 150 : SortGroupClause *sortcl = (SortGroupClause *) lfirst(lc);
188 150 : TargetEntry *tle = get_sortgroupclause_tle(sortcl,
189 : aggref->args);
190 :
191 : /* the parser should have made sure of this */
192 : Assert(OidIsValid(sortcl->sortop));
193 :
194 150 : qstate->sortColIdx[i] = tle->resno;
195 150 : qstate->sortOperators[i] = sortcl->sortop;
196 150 : qstate->eqOperators[i] = sortcl->eqop;
197 150 : qstate->sortCollations[i] = exprCollation((Node *) tle->expr);
198 150 : qstate->sortNullsFirsts[i] = sortcl->nulls_first;
199 150 : i++;
200 : }
201 :
202 100 : if (ishypothetical)
203 : {
204 : /* Add an integer flag column as the last sort column */
205 100 : qstate->sortColIdx[i] = list_length(aggref->args) + 1;
206 100 : qstate->sortOperators[i] = Int4LessOperator;
207 100 : qstate->eqOperators[i] = Int4EqualOperator;
208 100 : qstate->sortCollations[i] = InvalidOid;
209 100 : qstate->sortNullsFirsts[i] = false;
210 100 : i++;
211 : }
212 :
213 : Assert(i == numSortCols);
214 :
215 : /*
216 : * Get a tupledesc corresponding to the aggregated inputs
217 : * (including sort expressions) of the agg.
218 : */
219 100 : qstate->tupdesc = ExecTypeFromTL(aggref->args);
220 :
221 : /* If we need a flag column, hack the tupledesc to include that */
222 100 : if (ishypothetical)
223 : {
224 : TupleDesc newdesc;
225 100 : int natts = qstate->tupdesc->natts;
226 :
227 100 : newdesc = CreateTemplateTupleDesc(natts + 1);
228 250 : for (i = 1; i <= natts; i++)
229 150 : TupleDescCopyEntry(newdesc, i, qstate->tupdesc, i);
230 :
231 100 : TupleDescInitEntry(newdesc,
232 100 : (AttrNumber) ++natts,
233 : "flag",
234 : INT4OID,
235 : -1,
236 : 0);
237 :
238 100 : FreeTupleDesc(qstate->tupdesc);
239 100 : qstate->tupdesc = newdesc;
240 : }
241 :
242 : /* Create slot we'll use to store/retrieve rows */
243 100 : qstate->tupslot = MakeSingleTupleTableSlot(qstate->tupdesc,
244 : &TTSOpsMinimalTuple);
245 : }
246 : else
247 : {
248 : /* Sort single datums */
249 : SortGroupClause *sortcl;
250 : TargetEntry *tle;
251 :
252 146 : if (numSortCols != 1 || aggref->aggkind == AGGKIND_HYPOTHETICAL)
253 0 : elog(ERROR, "ordered-set aggregate support function does not support multiple aggregated columns");
254 :
255 146 : sortcl = (SortGroupClause *) linitial(sortlist);
256 146 : tle = get_sortgroupclause_tle(sortcl, aggref->args);
257 :
258 : /* the parser should have made sure of this */
259 : Assert(OidIsValid(sortcl->sortop));
260 :
261 : /* Save sort ordering info */
262 146 : qstate->sortColType = exprType((Node *) tle->expr);
263 146 : qstate->sortOperator = sortcl->sortop;
264 146 : qstate->eqOperator = sortcl->eqop;
265 146 : qstate->sortCollation = exprCollation((Node *) tle->expr);
266 146 : qstate->sortNullsFirst = sortcl->nulls_first;
267 :
268 : /* Save datatype info */
269 146 : get_typlenbyvalalign(qstate->sortColType,
270 : &qstate->typLen,
271 : &qstate->typByVal,
272 : &qstate->typAlign);
273 : }
274 :
275 246 : fcinfo->flinfo->fn_extra = (void *) qstate;
276 :
277 246 : MemoryContextSwitchTo(oldcontext);
278 : }
279 :
280 : /* Now build the stuff we need in group-lifespan context */
281 660 : oldcontext = MemoryContextSwitchTo(gcontext);
282 :
283 660 : osastate = (OSAPerGroupState *) palloc(sizeof(OSAPerGroupState));
284 660 : osastate->qstate = qstate;
285 660 : osastate->gcontext = gcontext;
286 :
287 660 : tuplesortopt = TUPLESORT_NONE;
288 :
289 660 : if (qstate->rescan_needed)
290 24 : tuplesortopt |= TUPLESORT_RANDOMACCESS;
291 :
292 : /*
293 : * Initialize tuplesort object.
294 : */
295 660 : if (use_tuples)
296 274 : osastate->sortstate = tuplesort_begin_heap(qstate->tupdesc,
297 : qstate->numSortCols,
298 : qstate->sortColIdx,
299 : qstate->sortOperators,
300 : qstate->sortCollations,
301 : qstate->sortNullsFirsts,
302 : work_mem,
303 : NULL,
304 : tuplesortopt);
305 : else
306 386 : osastate->sortstate = tuplesort_begin_datum(qstate->sortColType,
307 : qstate->sortOperator,
308 : qstate->sortCollation,
309 386 : qstate->sortNullsFirst,
310 : work_mem,
311 : NULL,
312 : tuplesortopt);
313 :
314 660 : osastate->number_of_rows = 0;
315 660 : osastate->sort_done = false;
316 :
317 : /* Now register a shutdown callback to clean things up at end of group */
318 660 : AggRegisterCallback(fcinfo,
319 : ordered_set_shutdown,
320 : PointerGetDatum(osastate));
321 :
322 660 : MemoryContextSwitchTo(oldcontext);
323 :
324 660 : return osastate;
325 : }
326 :
327 : /*
328 : * Clean up when evaluation of an ordered-set aggregate is complete.
329 : *
330 : * We don't need to bother freeing objects in the per-group memory context,
331 : * since that will get reset anyway by nodeAgg.c; nor should we free anything
332 : * in the per-query context, which will get cleared (if this was the last
333 : * group) by ExecutorEnd. But we must take care to release any potential
334 : * non-memory resources.
335 : *
336 : * In the case where we're not expecting multiple finalfn calls, we could
337 : * arguably rely on the finalfn to clean up; but it's easier and more testable
338 : * if we just do it the same way in either case.
339 : */
340 : static void
341 660 : ordered_set_shutdown(Datum arg)
342 : {
343 660 : OSAPerGroupState *osastate = (OSAPerGroupState *) DatumGetPointer(arg);
344 :
345 : /* Tuplesort object might have temp files. */
346 660 : if (osastate->sortstate)
347 660 : tuplesort_end(osastate->sortstate);
348 660 : osastate->sortstate = NULL;
349 : /* The tupleslot probably can't be holding a pin, but let's be safe. */
350 660 : if (osastate->qstate->tupslot)
351 274 : ExecClearTuple(osastate->qstate->tupslot);
352 660 : }
353 :
354 :
355 : /*
356 : * Generic transition function for ordered-set aggregates
357 : * with a single input column in which we want to suppress nulls
358 : */
359 : Datum
360 1203698 : ordered_set_transition(PG_FUNCTION_ARGS)
361 : {
362 : OSAPerGroupState *osastate;
363 :
364 : /* If first call, create the transition state workspace */
365 1203698 : if (PG_ARGISNULL(0))
366 386 : osastate = ordered_set_startup(fcinfo, false);
367 : else
368 1203312 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
369 :
370 : /* Load the datum into the tuplesort object, but only if it's not null */
371 1203698 : if (!PG_ARGISNULL(1))
372 : {
373 1203626 : tuplesort_putdatum(osastate->sortstate, PG_GETARG_DATUM(1), false);
374 1203626 : osastate->number_of_rows++;
375 : }
376 :
377 1203698 : PG_RETURN_POINTER(osastate);
378 : }
379 :
380 : /*
381 : * Generic transition function for ordered-set aggregates
382 : * with (potentially) multiple aggregated input columns
383 : */
384 : Datum
385 302788 : ordered_set_transition_multi(PG_FUNCTION_ARGS)
386 : {
387 : OSAPerGroupState *osastate;
388 : TupleTableSlot *slot;
389 : int nargs;
390 : int i;
391 :
392 : /* If first call, create the transition state workspace */
393 302788 : if (PG_ARGISNULL(0))
394 274 : osastate = ordered_set_startup(fcinfo, true);
395 : else
396 302514 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
397 :
398 : /* Form a tuple from all the other inputs besides the transition value */
399 302788 : slot = osastate->qstate->tupslot;
400 302788 : ExecClearTuple(slot);
401 302788 : nargs = PG_NARGS() - 1;
402 1206226 : for (i = 0; i < nargs; i++)
403 : {
404 903438 : slot->tts_values[i] = PG_GETARG_DATUM(i + 1);
405 903438 : slot->tts_isnull[i] = PG_ARGISNULL(i + 1);
406 : }
407 302788 : if (osastate->qstate->aggref->aggkind == AGGKIND_HYPOTHETICAL)
408 : {
409 : /* Add a zero flag value to mark this row as a normal input row */
410 302788 : slot->tts_values[i] = Int32GetDatum(0);
411 302788 : slot->tts_isnull[i] = false;
412 302788 : i++;
413 : }
414 : Assert(i == slot->tts_tupleDescriptor->natts);
415 302788 : ExecStoreVirtualTuple(slot);
416 :
417 : /* Load the row into the tuplesort object */
418 302788 : tuplesort_puttupleslot(osastate->sortstate, slot);
419 302788 : osastate->number_of_rows++;
420 :
421 302788 : PG_RETURN_POINTER(osastate);
422 : }
423 :
424 :
425 : /*
426 : * percentile_disc(float8) within group(anyelement) - discrete percentile
427 : */
428 : Datum
429 270 : percentile_disc_final(PG_FUNCTION_ARGS)
430 : {
431 : OSAPerGroupState *osastate;
432 : double percentile;
433 : Datum val;
434 : bool isnull;
435 : int64 rownum;
436 :
437 : Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
438 :
439 : /* Get and check the percentile argument */
440 270 : if (PG_ARGISNULL(1))
441 0 : PG_RETURN_NULL();
442 :
443 270 : percentile = PG_GETARG_FLOAT8(1);
444 :
445 270 : if (percentile < 0 || percentile > 1 || isnan(percentile))
446 0 : ereport(ERROR,
447 : (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
448 : errmsg("percentile value %g is not between 0 and 1",
449 : percentile)));
450 :
451 : /* If there were no regular rows, the result is NULL */
452 270 : if (PG_ARGISNULL(0))
453 54 : PG_RETURN_NULL();
454 :
455 216 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
456 :
457 : /* number_of_rows could be zero if we only saw NULL input values */
458 216 : if (osastate->number_of_rows == 0)
459 0 : PG_RETURN_NULL();
460 :
461 : /* Finish the sort, or rescan if we already did */
462 216 : if (!osastate->sort_done)
463 : {
464 192 : tuplesort_performsort(osastate->sortstate);
465 192 : osastate->sort_done = true;
466 : }
467 : else
468 24 : tuplesort_rescan(osastate->sortstate);
469 :
470 : /*----------
471 : * We need the smallest K such that (K/N) >= percentile.
472 : * N>0, therefore K >= N*percentile, therefore K = ceil(N*percentile).
473 : * So we skip K-1 rows (if K>0) and return the next row fetched.
474 : *----------
475 : */
476 216 : rownum = (int64) ceil(percentile * osastate->number_of_rows);
477 : Assert(rownum <= osastate->number_of_rows);
478 :
479 216 : if (rownum > 1)
480 : {
481 156 : if (!tuplesort_skiptuples(osastate->sortstate, rownum - 1, true))
482 0 : elog(ERROR, "missing row in percentile_disc");
483 : }
484 :
485 216 : if (!tuplesort_getdatum(osastate->sortstate, true, &val, &isnull, NULL))
486 0 : elog(ERROR, "missing row in percentile_disc");
487 :
488 : /* We shouldn't have stored any nulls, but do the right thing anyway */
489 216 : if (isnull)
490 0 : PG_RETURN_NULL();
491 : else
492 216 : PG_RETURN_DATUM(val);
493 : }
494 :
495 :
496 : /*
497 : * For percentile_cont, we need a way to interpolate between consecutive
498 : * values. Use a helper function for that, so that we can share the rest
499 : * of the code between types.
500 : */
501 : typedef Datum (*LerpFunc) (Datum lo, Datum hi, double pct);
502 :
503 : static Datum
504 132 : float8_lerp(Datum lo, Datum hi, double pct)
505 : {
506 132 : double loval = DatumGetFloat8(lo);
507 132 : double hival = DatumGetFloat8(hi);
508 :
509 132 : return Float8GetDatum(loval + (pct * (hival - loval)));
510 : }
511 :
512 : static Datum
513 0 : interval_lerp(Datum lo, Datum hi, double pct)
514 : {
515 0 : Datum diff_result = DirectFunctionCall2(interval_mi, hi, lo);
516 0 : Datum mul_result = DirectFunctionCall2(interval_mul,
517 : diff_result,
518 : Float8GetDatumFast(pct));
519 :
520 0 : return DirectFunctionCall2(interval_pl, mul_result, lo);
521 : }
522 :
523 : /*
524 : * Continuous percentile
525 : */
526 : static Datum
527 104 : percentile_cont_final_common(FunctionCallInfo fcinfo,
528 : Oid expect_type,
529 : LerpFunc lerpfunc)
530 : {
531 : OSAPerGroupState *osastate;
532 : double percentile;
533 104 : int64 first_row = 0;
534 104 : int64 second_row = 0;
535 : Datum val;
536 : Datum first_val;
537 : Datum second_val;
538 : double proportion;
539 : bool isnull;
540 :
541 : Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
542 :
543 : /* Get and check the percentile argument */
544 104 : if (PG_ARGISNULL(1))
545 0 : PG_RETURN_NULL();
546 :
547 104 : percentile = PG_GETARG_FLOAT8(1);
548 :
549 104 : if (percentile < 0 || percentile > 1 || isnan(percentile))
550 0 : ereport(ERROR,
551 : (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
552 : errmsg("percentile value %g is not between 0 and 1",
553 : percentile)));
554 :
555 : /* If there were no regular rows, the result is NULL */
556 104 : if (PG_ARGISNULL(0))
557 0 : PG_RETURN_NULL();
558 :
559 104 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
560 :
561 : /* number_of_rows could be zero if we only saw NULL input values */
562 104 : if (osastate->number_of_rows == 0)
563 0 : PG_RETURN_NULL();
564 :
565 : Assert(expect_type == osastate->qstate->sortColType);
566 :
567 : /* Finish the sort, or rescan if we already did */
568 104 : if (!osastate->sort_done)
569 : {
570 104 : tuplesort_performsort(osastate->sortstate);
571 104 : osastate->sort_done = true;
572 : }
573 : else
574 0 : tuplesort_rescan(osastate->sortstate);
575 :
576 104 : first_row = floor(percentile * (osastate->number_of_rows - 1));
577 104 : second_row = ceil(percentile * (osastate->number_of_rows - 1));
578 :
579 : Assert(first_row < osastate->number_of_rows);
580 :
581 104 : if (!tuplesort_skiptuples(osastate->sortstate, first_row, true))
582 0 : elog(ERROR, "missing row in percentile_cont");
583 :
584 104 : if (!tuplesort_getdatum(osastate->sortstate, true, &first_val, &isnull, NULL))
585 0 : elog(ERROR, "missing row in percentile_cont");
586 104 : if (isnull)
587 0 : PG_RETURN_NULL();
588 :
589 104 : if (first_row == second_row)
590 : {
591 32 : val = first_val;
592 : }
593 : else
594 : {
595 72 : if (!tuplesort_getdatum(osastate->sortstate, true, &second_val, &isnull, NULL))
596 0 : elog(ERROR, "missing row in percentile_cont");
597 :
598 72 : if (isnull)
599 0 : PG_RETURN_NULL();
600 :
601 72 : proportion = (percentile * (osastate->number_of_rows - 1)) - first_row;
602 72 : val = lerpfunc(first_val, second_val, proportion);
603 : }
604 :
605 104 : PG_RETURN_DATUM(val);
606 : }
607 :
608 : /*
609 : * percentile_cont(float8) within group (float8) - continuous percentile
610 : */
611 : Datum
612 104 : percentile_cont_float8_final(PG_FUNCTION_ARGS)
613 : {
614 104 : return percentile_cont_final_common(fcinfo, FLOAT8OID, float8_lerp);
615 : }
616 :
617 : /*
618 : * percentile_cont(float8) within group (interval) - continuous percentile
619 : */
620 : Datum
621 0 : percentile_cont_interval_final(PG_FUNCTION_ARGS)
622 : {
623 0 : return percentile_cont_final_common(fcinfo, INTERVALOID, interval_lerp);
624 : }
625 :
626 :
627 : /*
628 : * Support code for handling arrays of percentiles
629 : *
630 : * Note: in each pct_info entry, second_row should be equal to or
631 : * exactly one more than first_row.
632 : */
633 : struct pct_info
634 : {
635 : int64 first_row; /* first row to sample */
636 : int64 second_row; /* possible second row to sample */
637 : double proportion; /* interpolation fraction */
638 : int idx; /* index of this item in original array */
639 : };
640 :
641 : /*
642 : * Sort comparator to sort pct_infos by first_row then second_row
643 : */
644 : static int
645 300 : pct_info_cmp(const void *pa, const void *pb)
646 : {
647 300 : const struct pct_info *a = (const struct pct_info *) pa;
648 300 : const struct pct_info *b = (const struct pct_info *) pb;
649 :
650 300 : if (a->first_row != b->first_row)
651 258 : return (a->first_row < b->first_row) ? -1 : 1;
652 42 : if (a->second_row != b->second_row)
653 6 : return (a->second_row < b->second_row) ? -1 : 1;
654 36 : return 0;
655 : }
656 :
657 : /*
658 : * Construct array showing which rows to sample for percentiles.
659 : */
660 : static struct pct_info *
661 30 : setup_pct_info(int num_percentiles,
662 : Datum *percentiles_datum,
663 : bool *percentiles_null,
664 : int64 rowcount,
665 : bool continuous)
666 : {
667 : struct pct_info *pct_info;
668 : int i;
669 :
670 30 : pct_info = (struct pct_info *) palloc(num_percentiles * sizeof(struct pct_info));
671 :
672 222 : for (i = 0; i < num_percentiles; i++)
673 : {
674 192 : pct_info[i].idx = i;
675 :
676 192 : if (percentiles_null[i])
677 : {
678 : /* dummy entry for any NULL in array */
679 12 : pct_info[i].first_row = 0;
680 12 : pct_info[i].second_row = 0;
681 12 : pct_info[i].proportion = 0;
682 : }
683 : else
684 : {
685 180 : double p = DatumGetFloat8(percentiles_datum[i]);
686 :
687 180 : if (p < 0 || p > 1 || isnan(p))
688 0 : ereport(ERROR,
689 : (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
690 : errmsg("percentile value %g is not between 0 and 1",
691 : p)));
692 :
693 180 : if (continuous)
694 : {
695 96 : pct_info[i].first_row = 1 + floor(p * (rowcount - 1));
696 96 : pct_info[i].second_row = 1 + ceil(p * (rowcount - 1));
697 96 : pct_info[i].proportion = (p * (rowcount - 1)) - floor(p * (rowcount - 1));
698 : }
699 : else
700 : {
701 : /*----------
702 : * We need the smallest K such that (K/N) >= percentile.
703 : * N>0, therefore K >= N*percentile, therefore
704 : * K = ceil(N*percentile); but not less than 1.
705 : *----------
706 : */
707 84 : int64 row = (int64) ceil(p * rowcount);
708 :
709 84 : row = Max(1, row);
710 84 : pct_info[i].first_row = row;
711 84 : pct_info[i].second_row = row;
712 84 : pct_info[i].proportion = 0;
713 : }
714 : }
715 : }
716 :
717 : /*
718 : * The parameter array wasn't necessarily in sorted order, but we need to
719 : * visit the rows in order, so sort by first_row/second_row.
720 : */
721 30 : qsort(pct_info, num_percentiles, sizeof(struct pct_info), pct_info_cmp);
722 :
723 30 : return pct_info;
724 : }
725 :
726 : /*
727 : * percentile_disc(float8[]) within group (anyelement) - discrete percentiles
728 : */
729 : Datum
730 18 : percentile_disc_multi_final(PG_FUNCTION_ARGS)
731 : {
732 : OSAPerGroupState *osastate;
733 : ArrayType *param;
734 : Datum *percentiles_datum;
735 : bool *percentiles_null;
736 : int num_percentiles;
737 : struct pct_info *pct_info;
738 : Datum *result_datum;
739 : bool *result_isnull;
740 18 : int64 rownum = 0;
741 18 : Datum val = (Datum) 0;
742 18 : bool isnull = true;
743 : int i;
744 :
745 : Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
746 :
747 : /* If there were no regular rows, the result is NULL */
748 18 : if (PG_ARGISNULL(0))
749 0 : PG_RETURN_NULL();
750 :
751 18 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
752 :
753 : /* number_of_rows could be zero if we only saw NULL input values */
754 18 : if (osastate->number_of_rows == 0)
755 0 : PG_RETURN_NULL();
756 :
757 : /* Deconstruct the percentile-array input */
758 18 : if (PG_ARGISNULL(1))
759 0 : PG_RETURN_NULL();
760 18 : param = PG_GETARG_ARRAYTYPE_P(1);
761 :
762 18 : deconstruct_array(param, FLOAT8OID,
763 : /* hard-wired info on type float8 */
764 : sizeof(float8), FLOAT8PASSBYVAL, TYPALIGN_DOUBLE,
765 : &percentiles_datum,
766 : &percentiles_null,
767 : &num_percentiles);
768 :
769 18 : if (num_percentiles == 0)
770 0 : PG_RETURN_POINTER(construct_empty_array(osastate->qstate->sortColType));
771 :
772 18 : pct_info = setup_pct_info(num_percentiles,
773 : percentiles_datum,
774 : percentiles_null,
775 : osastate->number_of_rows,
776 : false);
777 :
778 18 : result_datum = (Datum *) palloc(num_percentiles * sizeof(Datum));
779 18 : result_isnull = (bool *) palloc(num_percentiles * sizeof(bool));
780 :
781 : /*
782 : * Start by dealing with any nulls in the param array - those are sorted
783 : * to the front on row=0, so set the corresponding result indexes to null
784 : */
785 30 : for (i = 0; i < num_percentiles; i++)
786 : {
787 30 : int idx = pct_info[i].idx;
788 :
789 30 : if (pct_info[i].first_row > 0)
790 18 : break;
791 :
792 12 : result_datum[idx] = (Datum) 0;
793 12 : result_isnull[idx] = true;
794 : }
795 :
796 : /*
797 : * If there's anything left after doing the nulls, then grind the input
798 : * and extract the needed values
799 : */
800 18 : if (i < num_percentiles)
801 : {
802 : /* Finish the sort, or rescan if we already did */
803 18 : if (!osastate->sort_done)
804 : {
805 18 : tuplesort_performsort(osastate->sortstate);
806 18 : osastate->sort_done = true;
807 : }
808 : else
809 0 : tuplesort_rescan(osastate->sortstate);
810 :
811 102 : for (; i < num_percentiles; i++)
812 : {
813 84 : int64 target_row = pct_info[i].first_row;
814 84 : int idx = pct_info[i].idx;
815 :
816 : /* Advance to target row, if not already there */
817 84 : if (target_row > rownum)
818 : {
819 84 : if (!tuplesort_skiptuples(osastate->sortstate, target_row - rownum - 1, true))
820 0 : elog(ERROR, "missing row in percentile_disc");
821 :
822 84 : if (!tuplesort_getdatum(osastate->sortstate, true, &val, &isnull, NULL))
823 0 : elog(ERROR, "missing row in percentile_disc");
824 :
825 84 : rownum = target_row;
826 : }
827 :
828 84 : result_datum[idx] = val;
829 84 : result_isnull[idx] = isnull;
830 : }
831 : }
832 :
833 : /* We make the output array the same shape as the input */
834 18 : PG_RETURN_POINTER(construct_md_array(result_datum, result_isnull,
835 : ARR_NDIM(param),
836 : ARR_DIMS(param),
837 : ARR_LBOUND(param),
838 : osastate->qstate->sortColType,
839 : osastate->qstate->typLen,
840 : osastate->qstate->typByVal,
841 : osastate->qstate->typAlign));
842 : }
843 :
844 : /*
845 : * percentile_cont(float8[]) within group () - continuous percentiles
846 : */
847 : static Datum
848 12 : percentile_cont_multi_final_common(FunctionCallInfo fcinfo,
849 : Oid expect_type,
850 : int16 typLen, bool typByVal, char typAlign,
851 : LerpFunc lerpfunc)
852 : {
853 : OSAPerGroupState *osastate;
854 : ArrayType *param;
855 : Datum *percentiles_datum;
856 : bool *percentiles_null;
857 : int num_percentiles;
858 : struct pct_info *pct_info;
859 : Datum *result_datum;
860 : bool *result_isnull;
861 12 : int64 rownum = 0;
862 12 : Datum first_val = (Datum) 0;
863 12 : Datum second_val = (Datum) 0;
864 : bool isnull;
865 : int i;
866 :
867 : Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
868 :
869 : /* If there were no regular rows, the result is NULL */
870 12 : if (PG_ARGISNULL(0))
871 0 : PG_RETURN_NULL();
872 :
873 12 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
874 :
875 : /* number_of_rows could be zero if we only saw NULL input values */
876 12 : if (osastate->number_of_rows == 0)
877 0 : PG_RETURN_NULL();
878 :
879 : Assert(expect_type == osastate->qstate->sortColType);
880 :
881 : /* Deconstruct the percentile-array input */
882 12 : if (PG_ARGISNULL(1))
883 0 : PG_RETURN_NULL();
884 12 : param = PG_GETARG_ARRAYTYPE_P(1);
885 :
886 12 : deconstruct_array(param, FLOAT8OID,
887 : /* hard-wired info on type float8 */
888 : sizeof(float8), FLOAT8PASSBYVAL, TYPALIGN_DOUBLE,
889 : &percentiles_datum,
890 : &percentiles_null,
891 : &num_percentiles);
892 :
893 12 : if (num_percentiles == 0)
894 0 : PG_RETURN_POINTER(construct_empty_array(osastate->qstate->sortColType));
895 :
896 12 : pct_info = setup_pct_info(num_percentiles,
897 : percentiles_datum,
898 : percentiles_null,
899 : osastate->number_of_rows,
900 : true);
901 :
902 12 : result_datum = (Datum *) palloc(num_percentiles * sizeof(Datum));
903 12 : result_isnull = (bool *) palloc(num_percentiles * sizeof(bool));
904 :
905 : /*
906 : * Start by dealing with any nulls in the param array - those are sorted
907 : * to the front on row=0, so set the corresponding result indexes to null
908 : */
909 12 : for (i = 0; i < num_percentiles; i++)
910 : {
911 12 : int idx = pct_info[i].idx;
912 :
913 12 : if (pct_info[i].first_row > 0)
914 12 : break;
915 :
916 0 : result_datum[idx] = (Datum) 0;
917 0 : result_isnull[idx] = true;
918 : }
919 :
920 : /*
921 : * If there's anything left after doing the nulls, then grind the input
922 : * and extract the needed values
923 : */
924 12 : if (i < num_percentiles)
925 : {
926 : /* Finish the sort, or rescan if we already did */
927 12 : if (!osastate->sort_done)
928 : {
929 12 : tuplesort_performsort(osastate->sortstate);
930 12 : osastate->sort_done = true;
931 : }
932 : else
933 0 : tuplesort_rescan(osastate->sortstate);
934 :
935 108 : for (; i < num_percentiles; i++)
936 : {
937 96 : int64 first_row = pct_info[i].first_row;
938 96 : int64 second_row = pct_info[i].second_row;
939 96 : int idx = pct_info[i].idx;
940 :
941 : /*
942 : * Advance to first_row, if not already there. Note that we might
943 : * already have rownum beyond first_row, in which case first_val
944 : * is already correct. (This occurs when interpolating between
945 : * the same two input rows as for the previous percentile.)
946 : */
947 96 : if (first_row > rownum)
948 : {
949 48 : if (!tuplesort_skiptuples(osastate->sortstate, first_row - rownum - 1, true))
950 0 : elog(ERROR, "missing row in percentile_cont");
951 :
952 48 : if (!tuplesort_getdatum(osastate->sortstate, true, &first_val,
953 48 : &isnull, NULL) || isnull)
954 0 : elog(ERROR, "missing row in percentile_cont");
955 :
956 48 : rownum = first_row;
957 : /* Always advance second_val to be latest input value */
958 48 : second_val = first_val;
959 : }
960 48 : else if (first_row == rownum)
961 : {
962 : /*
963 : * We are already at the desired row, so we must previously
964 : * have read its value into second_val (and perhaps first_val
965 : * as well, but this assignment is harmless in that case).
966 : */
967 24 : first_val = second_val;
968 : }
969 :
970 : /* Fetch second_row if needed */
971 96 : if (second_row > rownum)
972 : {
973 36 : if (!tuplesort_getdatum(osastate->sortstate, true, &second_val,
974 36 : &isnull, NULL) || isnull)
975 0 : elog(ERROR, "missing row in percentile_cont");
976 36 : rownum++;
977 : }
978 : /* We should now certainly be on second_row exactly */
979 : Assert(second_row == rownum);
980 :
981 : /* Compute appropriate result */
982 96 : if (second_row > first_row)
983 60 : result_datum[idx] = lerpfunc(first_val, second_val,
984 60 : pct_info[i].proportion);
985 : else
986 36 : result_datum[idx] = first_val;
987 :
988 96 : result_isnull[idx] = false;
989 : }
990 : }
991 :
992 : /* We make the output array the same shape as the input */
993 12 : PG_RETURN_POINTER(construct_md_array(result_datum, result_isnull,
994 : ARR_NDIM(param),
995 : ARR_DIMS(param), ARR_LBOUND(param),
996 : expect_type,
997 : typLen,
998 : typByVal,
999 : typAlign));
1000 : }
1001 :
1002 : /*
1003 : * percentile_cont(float8[]) within group (float8) - continuous percentiles
1004 : */
1005 : Datum
1006 12 : percentile_cont_float8_multi_final(PG_FUNCTION_ARGS)
1007 : {
1008 12 : return percentile_cont_multi_final_common(fcinfo,
1009 : FLOAT8OID,
1010 : /* hard-wired info on type float8 */
1011 : sizeof(float8),
1012 : FLOAT8PASSBYVAL,
1013 : TYPALIGN_DOUBLE,
1014 : float8_lerp);
1015 : }
1016 :
1017 : /*
1018 : * percentile_cont(float8[]) within group (interval) - continuous percentiles
1019 : */
1020 : Datum
1021 0 : percentile_cont_interval_multi_final(PG_FUNCTION_ARGS)
1022 : {
1023 0 : return percentile_cont_multi_final_common(fcinfo,
1024 : INTERVALOID,
1025 : /* hard-wired info on type interval */
1026 : 16, false, TYPALIGN_DOUBLE,
1027 : interval_lerp);
1028 : }
1029 :
1030 :
1031 : /*
1032 : * mode() within group (anyelement) - most common value
1033 : */
1034 : Datum
1035 60 : mode_final(PG_FUNCTION_ARGS)
1036 : {
1037 : OSAPerGroupState *osastate;
1038 : Datum val;
1039 : bool isnull;
1040 60 : Datum mode_val = (Datum) 0;
1041 60 : int64 mode_freq = 0;
1042 60 : Datum last_val = (Datum) 0;
1043 60 : int64 last_val_freq = 0;
1044 60 : bool last_val_is_mode = false;
1045 : FmgrInfo *equalfn;
1046 60 : Datum abbrev_val = (Datum) 0;
1047 60 : Datum last_abbrev_val = (Datum) 0;
1048 : bool shouldfree;
1049 :
1050 : Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
1051 :
1052 : /* If there were no regular rows, the result is NULL */
1053 60 : if (PG_ARGISNULL(0))
1054 0 : PG_RETURN_NULL();
1055 :
1056 60 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
1057 :
1058 : /* number_of_rows could be zero if we only saw NULL input values */
1059 60 : if (osastate->number_of_rows == 0)
1060 0 : PG_RETURN_NULL();
1061 :
1062 : /* Look up the equality function for the datatype, if we didn't already */
1063 60 : equalfn = &(osastate->qstate->equalfn);
1064 60 : if (!OidIsValid(equalfn->fn_oid))
1065 6 : fmgr_info_cxt(get_opcode(osastate->qstate->eqOperator), equalfn,
1066 6 : osastate->qstate->qcontext);
1067 :
1068 60 : shouldfree = !(osastate->qstate->typByVal);
1069 :
1070 : /* Finish the sort, or rescan if we already did */
1071 60 : if (!osastate->sort_done)
1072 : {
1073 60 : tuplesort_performsort(osastate->sortstate);
1074 60 : osastate->sort_done = true;
1075 : }
1076 : else
1077 0 : tuplesort_rescan(osastate->sortstate);
1078 :
1079 : /* Scan tuples and count frequencies */
1080 60060 : while (tuplesort_getdatum(osastate->sortstate, true, &val, &isnull, &abbrev_val))
1081 : {
1082 : /* we don't expect any nulls, but ignore them if found */
1083 60000 : if (isnull)
1084 0 : continue;
1085 :
1086 60000 : if (last_val_freq == 0)
1087 : {
1088 : /* first nonnull value - it's the mode for now */
1089 60 : mode_val = last_val = val;
1090 60 : mode_freq = last_val_freq = 1;
1091 60 : last_val_is_mode = true;
1092 60 : last_abbrev_val = abbrev_val;
1093 : }
1094 119880 : else if (abbrev_val == last_abbrev_val &&
1095 59940 : DatumGetBool(FunctionCall2Coll(equalfn, PG_GET_COLLATION(), val, last_val)))
1096 : {
1097 : /* value equal to previous value, count it */
1098 59760 : if (last_val_is_mode)
1099 15924 : mode_freq++; /* needn't maintain last_val_freq */
1100 43836 : else if (++last_val_freq > mode_freq)
1101 : {
1102 : /* last_val becomes new mode */
1103 66 : if (shouldfree)
1104 66 : pfree(DatumGetPointer(mode_val));
1105 66 : mode_val = last_val;
1106 66 : mode_freq = last_val_freq;
1107 66 : last_val_is_mode = true;
1108 : }
1109 59760 : if (shouldfree)
1110 59760 : pfree(DatumGetPointer(val));
1111 : }
1112 : else
1113 : {
1114 : /* val should replace last_val */
1115 180 : if (shouldfree && !last_val_is_mode)
1116 72 : pfree(DatumGetPointer(last_val));
1117 180 : last_val = val;
1118 : /* avoid equality function calls by reusing abbreviated keys */
1119 180 : last_abbrev_val = abbrev_val;
1120 180 : last_val_freq = 1;
1121 180 : last_val_is_mode = false;
1122 : }
1123 :
1124 60000 : CHECK_FOR_INTERRUPTS();
1125 : }
1126 :
1127 60 : if (shouldfree && !last_val_is_mode)
1128 42 : pfree(DatumGetPointer(last_val));
1129 :
1130 60 : if (mode_freq)
1131 60 : PG_RETURN_DATUM(mode_val);
1132 : else
1133 0 : PG_RETURN_NULL();
1134 : }
1135 :
1136 :
1137 : /*
1138 : * Common code to sanity-check args for hypothetical-set functions. No need
1139 : * for friendly errors, these can only happen if someone's messing up the
1140 : * aggregate definitions. The checks are needed for security, however.
1141 : */
1142 : static void
1143 274 : hypothetical_check_argtypes(FunctionCallInfo fcinfo, int nargs,
1144 : TupleDesc tupdesc)
1145 : {
1146 : int i;
1147 :
1148 : /* check that we have an int4 flag column */
1149 274 : if (!tupdesc ||
1150 274 : (nargs + 1) != tupdesc->natts ||
1151 274 : TupleDescAttr(tupdesc, nargs)->atttypid != INT4OID)
1152 0 : elog(ERROR, "type mismatch in hypothetical-set function");
1153 :
1154 : /* check that direct args match in type with aggregated args */
1155 838 : for (i = 0; i < nargs; i++)
1156 : {
1157 564 : Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
1158 :
1159 564 : if (get_fn_expr_argtype(fcinfo->flinfo, i + 1) != attr->atttypid)
1160 0 : elog(ERROR, "type mismatch in hypothetical-set function");
1161 : }
1162 274 : }
1163 :
1164 : /*
1165 : * compute rank of hypothetical row
1166 : *
1167 : * flag should be -1 to sort hypothetical row ahead of its peers, or +1
1168 : * to sort behind.
1169 : * total number of regular rows is returned into *number_of_rows.
1170 : */
1171 : static int64
1172 250 : hypothetical_rank_common(FunctionCallInfo fcinfo, int flag,
1173 : int64 *number_of_rows)
1174 : {
1175 250 : int nargs = PG_NARGS() - 1;
1176 250 : int64 rank = 1;
1177 : OSAPerGroupState *osastate;
1178 : TupleTableSlot *slot;
1179 : int i;
1180 :
1181 : Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
1182 :
1183 : /* If there were no regular rows, the rank is always 1 */
1184 250 : if (PG_ARGISNULL(0))
1185 : {
1186 6 : *number_of_rows = 0;
1187 6 : return 1;
1188 : }
1189 :
1190 244 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
1191 244 : *number_of_rows = osastate->number_of_rows;
1192 :
1193 : /* Adjust nargs to be the number of direct (or aggregated) args */
1194 244 : if (nargs % 2 != 0)
1195 0 : elog(ERROR, "wrong number of arguments in hypothetical-set function");
1196 244 : nargs /= 2;
1197 :
1198 244 : hypothetical_check_argtypes(fcinfo, nargs, osastate->qstate->tupdesc);
1199 :
1200 : /* because we need a hypothetical row, we can't share transition state */
1201 : Assert(!osastate->sort_done);
1202 :
1203 : /* insert the hypothetical row into the sort */
1204 244 : slot = osastate->qstate->tupslot;
1205 244 : ExecClearTuple(slot);
1206 778 : for (i = 0; i < nargs; i++)
1207 : {
1208 534 : slot->tts_values[i] = PG_GETARG_DATUM(i + 1);
1209 534 : slot->tts_isnull[i] = PG_ARGISNULL(i + 1);
1210 : }
1211 244 : slot->tts_values[i] = Int32GetDatum(flag);
1212 244 : slot->tts_isnull[i] = false;
1213 244 : ExecStoreVirtualTuple(slot);
1214 :
1215 244 : tuplesort_puttupleslot(osastate->sortstate, slot);
1216 :
1217 : /* finish the sort */
1218 244 : tuplesort_performsort(osastate->sortstate);
1219 244 : osastate->sort_done = true;
1220 :
1221 : /* iterate till we find the hypothetical row */
1222 4274 : while (tuplesort_gettupleslot(osastate->sortstate, true, true, slot, NULL))
1223 : {
1224 : bool isnull;
1225 4274 : Datum d = slot_getattr(slot, nargs + 1, &isnull);
1226 :
1227 4274 : if (!isnull && DatumGetInt32(d) != 0)
1228 244 : break;
1229 :
1230 4030 : rank++;
1231 :
1232 4030 : CHECK_FOR_INTERRUPTS();
1233 : }
1234 :
1235 244 : ExecClearTuple(slot);
1236 :
1237 244 : return rank;
1238 : }
1239 :
1240 :
1241 : /*
1242 : * rank() - rank of hypothetical row
1243 : */
1244 : Datum
1245 232 : hypothetical_rank_final(PG_FUNCTION_ARGS)
1246 : {
1247 : int64 rank;
1248 : int64 rowcount;
1249 :
1250 232 : rank = hypothetical_rank_common(fcinfo, -1, &rowcount);
1251 :
1252 232 : PG_RETURN_INT64(rank);
1253 : }
1254 :
1255 : /*
1256 : * percent_rank() - percentile rank of hypothetical row
1257 : */
1258 : Datum
1259 12 : hypothetical_percent_rank_final(PG_FUNCTION_ARGS)
1260 : {
1261 : int64 rank;
1262 : int64 rowcount;
1263 : double result_val;
1264 :
1265 12 : rank = hypothetical_rank_common(fcinfo, -1, &rowcount);
1266 :
1267 12 : if (rowcount == 0)
1268 6 : PG_RETURN_FLOAT8(0);
1269 :
1270 6 : result_val = (double) (rank - 1) / (double) (rowcount);
1271 :
1272 6 : PG_RETURN_FLOAT8(result_val);
1273 : }
1274 :
1275 : /*
1276 : * cume_dist() - cumulative distribution of hypothetical row
1277 : */
1278 : Datum
1279 6 : hypothetical_cume_dist_final(PG_FUNCTION_ARGS)
1280 : {
1281 : int64 rank;
1282 : int64 rowcount;
1283 : double result_val;
1284 :
1285 6 : rank = hypothetical_rank_common(fcinfo, 1, &rowcount);
1286 :
1287 6 : result_val = (double) (rank) / (double) (rowcount + 1);
1288 :
1289 6 : PG_RETURN_FLOAT8(result_val);
1290 : }
1291 :
1292 : /*
1293 : * dense_rank() - rank of hypothetical row without gaps in ranking
1294 : */
1295 : Datum
1296 30 : hypothetical_dense_rank_final(PG_FUNCTION_ARGS)
1297 : {
1298 : ExprContext *econtext;
1299 : ExprState *compareTuple;
1300 30 : int nargs = PG_NARGS() - 1;
1301 30 : int64 rank = 1;
1302 30 : int64 duplicate_count = 0;
1303 : OSAPerGroupState *osastate;
1304 : int numDistinctCols;
1305 30 : Datum abbrevVal = (Datum) 0;
1306 30 : Datum abbrevOld = (Datum) 0;
1307 : TupleTableSlot *slot;
1308 : TupleTableSlot *extraslot;
1309 : TupleTableSlot *slot2;
1310 : int i;
1311 :
1312 : Assert(AggCheckCallContext(fcinfo, NULL) == AGG_CONTEXT_AGGREGATE);
1313 :
1314 : /* If there were no regular rows, the rank is always 1 */
1315 30 : if (PG_ARGISNULL(0))
1316 0 : PG_RETURN_INT64(rank);
1317 :
1318 30 : osastate = (OSAPerGroupState *) PG_GETARG_POINTER(0);
1319 30 : econtext = osastate->qstate->econtext;
1320 30 : if (!econtext)
1321 : {
1322 : MemoryContext oldcontext;
1323 :
1324 : /* Make sure to we create econtext under correct parent context. */
1325 18 : oldcontext = MemoryContextSwitchTo(osastate->qstate->qcontext);
1326 18 : osastate->qstate->econtext = CreateStandaloneExprContext();
1327 18 : econtext = osastate->qstate->econtext;
1328 18 : MemoryContextSwitchTo(oldcontext);
1329 : }
1330 :
1331 : /* Adjust nargs to be the number of direct (or aggregated) args */
1332 30 : if (nargs % 2 != 0)
1333 0 : elog(ERROR, "wrong number of arguments in hypothetical-set function");
1334 30 : nargs /= 2;
1335 :
1336 30 : hypothetical_check_argtypes(fcinfo, nargs, osastate->qstate->tupdesc);
1337 :
1338 : /*
1339 : * When comparing tuples, we can omit the flag column since we will only
1340 : * compare rows with flag == 0.
1341 : */
1342 30 : numDistinctCols = osastate->qstate->numSortCols - 1;
1343 :
1344 : /* Build tuple comparator, if we didn't already */
1345 30 : compareTuple = osastate->qstate->compareTuple;
1346 30 : if (compareTuple == NULL)
1347 : {
1348 18 : AttrNumber *sortColIdx = osastate->qstate->sortColIdx;
1349 : MemoryContext oldContext;
1350 :
1351 18 : oldContext = MemoryContextSwitchTo(osastate->qstate->qcontext);
1352 18 : compareTuple = execTuplesMatchPrepare(osastate->qstate->tupdesc,
1353 : numDistinctCols,
1354 : sortColIdx,
1355 18 : osastate->qstate->eqOperators,
1356 18 : osastate->qstate->sortCollations,
1357 : NULL);
1358 18 : MemoryContextSwitchTo(oldContext);
1359 18 : osastate->qstate->compareTuple = compareTuple;
1360 : }
1361 :
1362 : /* because we need a hypothetical row, we can't share transition state */
1363 : Assert(!osastate->sort_done);
1364 :
1365 : /* insert the hypothetical row into the sort */
1366 30 : slot = osastate->qstate->tupslot;
1367 30 : ExecClearTuple(slot);
1368 60 : for (i = 0; i < nargs; i++)
1369 : {
1370 30 : slot->tts_values[i] = PG_GETARG_DATUM(i + 1);
1371 30 : slot->tts_isnull[i] = PG_ARGISNULL(i + 1);
1372 : }
1373 30 : slot->tts_values[i] = Int32GetDatum(-1);
1374 30 : slot->tts_isnull[i] = false;
1375 30 : ExecStoreVirtualTuple(slot);
1376 :
1377 30 : tuplesort_puttupleslot(osastate->sortstate, slot);
1378 :
1379 : /* finish the sort */
1380 30 : tuplesort_performsort(osastate->sortstate);
1381 30 : osastate->sort_done = true;
1382 :
1383 : /*
1384 : * We alternate fetching into tupslot and extraslot so that we have the
1385 : * previous row available for comparisons. This is accomplished by
1386 : * swapping the slot pointer variables after each row.
1387 : */
1388 30 : extraslot = MakeSingleTupleTableSlot(osastate->qstate->tupdesc,
1389 : &TTSOpsMinimalTuple);
1390 30 : slot2 = extraslot;
1391 :
1392 : /* iterate till we find the hypothetical row */
1393 66 : while (tuplesort_gettupleslot(osastate->sortstate, true, true, slot,
1394 : &abbrevVal))
1395 : {
1396 : bool isnull;
1397 66 : Datum d = slot_getattr(slot, nargs + 1, &isnull);
1398 : TupleTableSlot *tmpslot;
1399 :
1400 66 : if (!isnull && DatumGetInt32(d) != 0)
1401 30 : break;
1402 :
1403 : /* count non-distinct tuples */
1404 36 : econtext->ecxt_outertuple = slot;
1405 36 : econtext->ecxt_innertuple = slot2;
1406 :
1407 36 : if (!TupIsNull(slot2) &&
1408 48 : abbrevVal == abbrevOld &&
1409 24 : ExecQualAndReset(compareTuple, econtext))
1410 12 : duplicate_count++;
1411 :
1412 36 : tmpslot = slot2;
1413 36 : slot2 = slot;
1414 36 : slot = tmpslot;
1415 : /* avoid ExecQual() calls by reusing abbreviated keys */
1416 36 : abbrevOld = abbrevVal;
1417 :
1418 36 : rank++;
1419 :
1420 36 : CHECK_FOR_INTERRUPTS();
1421 : }
1422 :
1423 30 : ExecClearTuple(slot);
1424 30 : ExecClearTuple(slot2);
1425 :
1426 30 : ExecDropSingleTupleTableSlot(extraslot);
1427 :
1428 30 : rank = rank - duplicate_count;
1429 :
1430 30 : PG_RETURN_INT64(rank);
1431 : }
|
