LCOV - code coverage report
Current view: top level - src/include/executor - tuptable.h (source / functions) Hit Total Coverage
Test: PostgreSQL 17devel Lines: 39 39 100.0 %
Date: 2024-04-25 00:11:39 Functions: 11 11 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * tuptable.h
       4             :  *    tuple table support stuff
       5             :  *
       6             :  *
       7             :  * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
       8             :  * Portions Copyright (c) 1994, Regents of the University of California
       9             :  *
      10             :  * src/include/executor/tuptable.h
      11             :  *
      12             :  *-------------------------------------------------------------------------
      13             :  */
      14             : #ifndef TUPTABLE_H
      15             : #define TUPTABLE_H
      16             : 
      17             : #include "access/htup.h"
      18             : #include "access/htup_details.h"
      19             : #include "access/sysattr.h"
      20             : #include "access/tupdesc.h"
      21             : #include "storage/buf.h"
      22             : 
      23             : /*----------
      24             :  * The executor stores tuples in a "tuple table" which is a List of
      25             :  * independent TupleTableSlots.
      26             :  *
      27             :  * There's various different types of tuple table slots, each being able to
      28             :  * store different types of tuples. Additional types of slots can be added
      29             :  * without modifying core code. The type of a slot is determined by the
      30             :  * TupleTableSlotOps* passed to the slot creation routine. The builtin types
      31             :  * of slots are
      32             :  *
      33             :  * 1. physical tuple in a disk buffer page (TTSOpsBufferHeapTuple)
      34             :  * 2. physical tuple constructed in palloc'ed memory (TTSOpsHeapTuple)
      35             :  * 3. "minimal" physical tuple constructed in palloc'ed memory
      36             :  *    (TTSOpsMinimalTuple)
      37             :  * 4. "virtual" tuple consisting of Datum/isnull arrays (TTSOpsVirtual)
      38             :  *
      39             :  *
      40             :  * The first two cases are similar in that they both deal with "materialized"
      41             :  * tuples, but resource management is different.  For a tuple in a disk page
      42             :  * we need to hold a pin on the buffer until the TupleTableSlot's reference
      43             :  * to the tuple is dropped; while for a palloc'd tuple we usually want the
      44             :  * tuple pfree'd when the TupleTableSlot's reference is dropped.
      45             :  *
      46             :  * A "minimal" tuple is handled similarly to a palloc'd regular tuple.
      47             :  * At present, minimal tuples never are stored in buffers, so there is no
      48             :  * parallel to case 1.  Note that a minimal tuple has no "system columns".
      49             :  *
      50             :  * A "virtual" tuple is an optimization used to minimize physical data copying
      51             :  * in a nest of plan nodes.  Until materialized pass-by-reference Datums in
      52             :  * the slot point to storage that is not directly associated with the
      53             :  * TupleTableSlot; generally they will point to part of a tuple stored in a
      54             :  * lower plan node's output TupleTableSlot, or to a function result
      55             :  * constructed in a plan node's per-tuple econtext.  It is the responsibility
      56             :  * of the generating plan node to be sure these resources are not released for
      57             :  * as long as the virtual tuple needs to be valid or is materialized.  Note
      58             :  * also that a virtual tuple does not have any "system columns".
      59             :  *
      60             :  * The Datum/isnull arrays of a TupleTableSlot serve double duty.  For virtual
      61             :  * slots they are the authoritative data.  For the other builtin slots,
      62             :  * the arrays contain data extracted from the tuple.  (In this state, any
      63             :  * pass-by-reference Datums point into the physical tuple.)  The extracted
      64             :  * information is built "lazily", ie, only as needed.  This serves to avoid
      65             :  * repeated extraction of data from the physical tuple.
      66             :  *
      67             :  * A TupleTableSlot can also be "empty", indicated by flag TTS_FLAG_EMPTY set
      68             :  * in tts_flags, holding no valid data.  This is the only valid state for a
      69             :  * freshly-created slot that has not yet had a tuple descriptor assigned to
      70             :  * it.  In this state, TTS_FLAG_SHOULDFREE should not be set in tts_flags and
      71             :  * tts_nvalid should be set to zero.
      72             :  *
      73             :  * The tupleDescriptor is simply referenced, not copied, by the TupleTableSlot
      74             :  * code.  The caller of ExecSetSlotDescriptor() is responsible for providing
      75             :  * a descriptor that will live as long as the slot does.  (Typically, both
      76             :  * slots and descriptors are in per-query memory and are freed by memory
      77             :  * context deallocation at query end; so it's not worth providing any extra
      78             :  * mechanism to do more.  However, the slot will increment the tupdesc
      79             :  * reference count if a reference-counted tupdesc is supplied.)
      80             :  *
      81             :  * When TTS_FLAG_SHOULDFREE is set in tts_flags, the physical tuple is "owned"
      82             :  * by the slot and should be freed when the slot's reference to the tuple is
      83             :  * dropped.
      84             :  *
      85             :  * tts_values/tts_isnull are allocated either when the slot is created (when
      86             :  * the descriptor is provided), or when a descriptor is assigned to the slot;
      87             :  * they are of length equal to the descriptor's natts.
      88             :  *
      89             :  * The TTS_FLAG_SLOW flag is saved state for
      90             :  * slot_deform_heap_tuple, and should not be touched by any other code.
      91             :  *----------
      92             :  */
      93             : 
      94             : /* true = slot is empty */
      95             : #define         TTS_FLAG_EMPTY          (1 << 1)
      96             : #define TTS_EMPTY(slot) (((slot)->tts_flags & TTS_FLAG_EMPTY) != 0)
      97             : 
      98             : /* should pfree tuple "owned" by the slot? */
      99             : #define         TTS_FLAG_SHOULDFREE     (1 << 2)
     100             : #define TTS_SHOULDFREE(slot) (((slot)->tts_flags & TTS_FLAG_SHOULDFREE) != 0)
     101             : 
     102             : /* saved state for slot_deform_heap_tuple */
     103             : #define         TTS_FLAG_SLOW       (1 << 3)
     104             : #define TTS_SLOW(slot) (((slot)->tts_flags & TTS_FLAG_SLOW) != 0)
     105             : 
     106             : /* fixed tuple descriptor */
     107             : #define         TTS_FLAG_FIXED      (1 << 4)
     108             : #define TTS_FIXED(slot) (((slot)->tts_flags & TTS_FLAG_FIXED) != 0)
     109             : 
     110             : struct TupleTableSlotOps;
     111             : typedef struct TupleTableSlotOps TupleTableSlotOps;
     112             : 
     113             : /* base tuple table slot type */
     114             : typedef struct TupleTableSlot
     115             : {
     116             :     NodeTag     type;
     117             : #define FIELDNO_TUPLETABLESLOT_FLAGS 1
     118             :     uint16      tts_flags;      /* Boolean states */
     119             : #define FIELDNO_TUPLETABLESLOT_NVALID 2
     120             :     AttrNumber  tts_nvalid;     /* # of valid values in tts_values */
     121             :     const TupleTableSlotOps *const tts_ops; /* implementation of slot */
     122             : #define FIELDNO_TUPLETABLESLOT_TUPLEDESCRIPTOR 4
     123             :     TupleDesc   tts_tupleDescriptor;    /* slot's tuple descriptor */
     124             : #define FIELDNO_TUPLETABLESLOT_VALUES 5
     125             :     Datum      *tts_values;     /* current per-attribute values */
     126             : #define FIELDNO_TUPLETABLESLOT_ISNULL 6
     127             :     bool       *tts_isnull;     /* current per-attribute isnull flags */
     128             :     MemoryContext tts_mcxt;     /* slot itself is in this context */
     129             :     ItemPointerData tts_tid;    /* stored tuple's tid */
     130             :     Oid         tts_tableOid;   /* table oid of tuple */
     131             : } TupleTableSlot;
     132             : 
     133             : /* routines for a TupleTableSlot implementation */
     134             : struct TupleTableSlotOps
     135             : {
     136             :     /* Minimum size of the slot */
     137             :     size_t      base_slot_size;
     138             : 
     139             :     /* Initialization. */
     140             :     void        (*init) (TupleTableSlot *slot);
     141             : 
     142             :     /* Destruction. */
     143             :     void        (*release) (TupleTableSlot *slot);
     144             : 
     145             :     /*
     146             :      * Clear the contents of the slot. Only the contents are expected to be
     147             :      * cleared and not the tuple descriptor. Typically an implementation of
     148             :      * this callback should free the memory allocated for the tuple contained
     149             :      * in the slot.
     150             :      */
     151             :     void        (*clear) (TupleTableSlot *slot);
     152             : 
     153             :     /*
     154             :      * Fill up first natts entries of tts_values and tts_isnull arrays with
     155             :      * values from the tuple contained in the slot. The function may be called
     156             :      * with natts more than the number of attributes available in the tuple,
     157             :      * in which case it should set tts_nvalid to the number of returned
     158             :      * columns.
     159             :      */
     160             :     void        (*getsomeattrs) (TupleTableSlot *slot, int natts);
     161             : 
     162             :     /*
     163             :      * Returns value of the given system attribute as a datum and sets isnull
     164             :      * to false, if it's not NULL. Throws an error if the slot type does not
     165             :      * support system attributes.
     166             :      */
     167             :     Datum       (*getsysattr) (TupleTableSlot *slot, int attnum, bool *isnull);
     168             : 
     169             :     /*
     170             :      * Check if the tuple is created by the current transaction. Throws an
     171             :      * error if the slot doesn't contain the storage tuple.
     172             :      */
     173             :     bool        (*is_current_xact_tuple) (TupleTableSlot *slot);
     174             : 
     175             :     /*
     176             :      * Make the contents of the slot solely depend on the slot, and not on
     177             :      * underlying resources (like another memory context, buffers, etc).
     178             :      */
     179             :     void        (*materialize) (TupleTableSlot *slot);
     180             : 
     181             :     /*
     182             :      * Copy the contents of the source slot into the destination slot's own
     183             :      * context. Invoked using callback of the destination slot.  'dstslot' and
     184             :      * 'srcslot' can be assumed to have the same number of attributes.
     185             :      */
     186             :     void        (*copyslot) (TupleTableSlot *dstslot, TupleTableSlot *srcslot);
     187             : 
     188             :     /*
     189             :      * Return a heap tuple "owned" by the slot. It is slot's responsibility to
     190             :      * free the memory consumed by the heap tuple. If the slot can not "own" a
     191             :      * heap tuple, it should not implement this callback and should set it as
     192             :      * NULL.
     193             :      */
     194             :     HeapTuple   (*get_heap_tuple) (TupleTableSlot *slot);
     195             : 
     196             :     /*
     197             :      * Return a minimal tuple "owned" by the slot. It is slot's responsibility
     198             :      * to free the memory consumed by the minimal tuple. If the slot can not
     199             :      * "own" a minimal tuple, it should not implement this callback and should
     200             :      * set it as NULL.
     201             :      */
     202             :     MinimalTuple (*get_minimal_tuple) (TupleTableSlot *slot);
     203             : 
     204             :     /*
     205             :      * Return a copy of heap tuple representing the contents of the slot. The
     206             :      * copy needs to be palloc'd in the current memory context. The slot
     207             :      * itself is expected to remain unaffected. It is *not* expected to have
     208             :      * meaningful "system columns" in the copy. The copy is not be "owned" by
     209             :      * the slot i.e. the caller has to take responsibility to free memory
     210             :      * consumed by the slot.
     211             :      */
     212             :     HeapTuple   (*copy_heap_tuple) (TupleTableSlot *slot);
     213             : 
     214             :     /*
     215             :      * Return a copy of minimal tuple representing the contents of the slot.
     216             :      * The copy needs to be palloc'd in the current memory context. The slot
     217             :      * itself is expected to remain unaffected. It is *not* expected to have
     218             :      * meaningful "system columns" in the copy. The copy is not be "owned" by
     219             :      * the slot i.e. the caller has to take responsibility to free memory
     220             :      * consumed by the slot.
     221             :      */
     222             :     MinimalTuple (*copy_minimal_tuple) (TupleTableSlot *slot);
     223             : };
     224             : 
     225             : /*
     226             :  * Predefined TupleTableSlotOps for various types of TupleTableSlotOps. The
     227             :  * same are used to identify the type of a given slot.
     228             :  */
     229             : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsVirtual;
     230             : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsHeapTuple;
     231             : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsMinimalTuple;
     232             : extern PGDLLIMPORT const TupleTableSlotOps TTSOpsBufferHeapTuple;
     233             : 
     234             : #define TTS_IS_VIRTUAL(slot) ((slot)->tts_ops == &TTSOpsVirtual)
     235             : #define TTS_IS_HEAPTUPLE(slot) ((slot)->tts_ops == &TTSOpsHeapTuple)
     236             : #define TTS_IS_MINIMALTUPLE(slot) ((slot)->tts_ops == &TTSOpsMinimalTuple)
     237             : #define TTS_IS_BUFFERTUPLE(slot) ((slot)->tts_ops == &TTSOpsBufferHeapTuple)
     238             : 
     239             : 
     240             : /*
     241             :  * Tuple table slot implementations.
     242             :  */
     243             : 
     244             : typedef struct VirtualTupleTableSlot
     245             : {
     246             :     pg_node_attr(abstract)
     247             : 
     248             :     TupleTableSlot base;
     249             : 
     250             :     char       *data;           /* data for materialized slots */
     251             : } VirtualTupleTableSlot;
     252             : 
     253             : typedef struct HeapTupleTableSlot
     254             : {
     255             :     pg_node_attr(abstract)
     256             : 
     257             :     TupleTableSlot base;
     258             : 
     259             : #define FIELDNO_HEAPTUPLETABLESLOT_TUPLE 1
     260             :     HeapTuple   tuple;          /* physical tuple */
     261             : #define FIELDNO_HEAPTUPLETABLESLOT_OFF 2
     262             :     uint32      off;            /* saved state for slot_deform_heap_tuple */
     263             :     HeapTupleData tupdata;      /* optional workspace for storing tuple */
     264             : } HeapTupleTableSlot;
     265             : 
     266             : /* heap tuple residing in a buffer */
     267             : typedef struct BufferHeapTupleTableSlot
     268             : {
     269             :     pg_node_attr(abstract)
     270             : 
     271             :     HeapTupleTableSlot base;
     272             : 
     273             :     /*
     274             :      * If buffer is not InvalidBuffer, then the slot is holding a pin on the
     275             :      * indicated buffer page; drop the pin when we release the slot's
     276             :      * reference to that buffer.  (TTS_FLAG_SHOULDFREE should not be set in
     277             :      * such a case, since presumably base.tuple is pointing into the buffer.)
     278             :      */
     279             :     Buffer      buffer;         /* tuple's buffer, or InvalidBuffer */
     280             : } BufferHeapTupleTableSlot;
     281             : 
     282             : typedef struct MinimalTupleTableSlot
     283             : {
     284             :     pg_node_attr(abstract)
     285             : 
     286             :     TupleTableSlot base;
     287             : 
     288             :     /*
     289             :      * In a minimal slot tuple points at minhdr and the fields of that struct
     290             :      * are set correctly for access to the minimal tuple; in particular,
     291             :      * minhdr.t_data points MINIMAL_TUPLE_OFFSET bytes before mintuple.  This
     292             :      * allows column extraction to treat the case identically to regular
     293             :      * physical tuples.
     294             :      */
     295             : #define FIELDNO_MINIMALTUPLETABLESLOT_TUPLE 1
     296             :     HeapTuple   tuple;          /* tuple wrapper */
     297             :     MinimalTuple mintuple;      /* minimal tuple, or NULL if none */
     298             :     HeapTupleData minhdr;       /* workspace for minimal-tuple-only case */
     299             : #define FIELDNO_MINIMALTUPLETABLESLOT_OFF 4
     300             :     uint32      off;            /* saved state for slot_deform_heap_tuple */
     301             : } MinimalTupleTableSlot;
     302             : 
     303             : /*
     304             :  * TupIsNull -- is a TupleTableSlot empty?
     305             :  */
     306             : #define TupIsNull(slot) \
     307             :     ((slot) == NULL || TTS_EMPTY(slot))
     308             : 
     309             : /* in executor/execTuples.c */
     310             : extern TupleTableSlot *MakeTupleTableSlot(TupleDesc tupleDesc,
     311             :                                           const TupleTableSlotOps *tts_ops);
     312             : extern TupleTableSlot *ExecAllocTableSlot(List **tupleTable, TupleDesc desc,
     313             :                                           const TupleTableSlotOps *tts_ops);
     314             : extern void ExecResetTupleTable(List *tupleTable, bool shouldFree);
     315             : extern TupleTableSlot *MakeSingleTupleTableSlot(TupleDesc tupdesc,
     316             :                                                 const TupleTableSlotOps *tts_ops);
     317             : extern void ExecDropSingleTupleTableSlot(TupleTableSlot *slot);
     318             : extern void ExecSetSlotDescriptor(TupleTableSlot *slot, TupleDesc tupdesc);
     319             : extern TupleTableSlot *ExecStoreHeapTuple(HeapTuple tuple,
     320             :                                           TupleTableSlot *slot,
     321             :                                           bool shouldFree);
     322             : extern void ExecForceStoreHeapTuple(HeapTuple tuple,
     323             :                                     TupleTableSlot *slot,
     324             :                                     bool shouldFree);
     325             : extern TupleTableSlot *ExecStoreBufferHeapTuple(HeapTuple tuple,
     326             :                                                 TupleTableSlot *slot,
     327             :                                                 Buffer buffer);
     328             : extern TupleTableSlot *ExecStorePinnedBufferHeapTuple(HeapTuple tuple,
     329             :                                                       TupleTableSlot *slot,
     330             :                                                       Buffer buffer);
     331             : extern TupleTableSlot *ExecStoreMinimalTuple(MinimalTuple mtup,
     332             :                                              TupleTableSlot *slot,
     333             :                                              bool shouldFree);
     334             : extern void ExecForceStoreMinimalTuple(MinimalTuple mtup, TupleTableSlot *slot,
     335             :                                        bool shouldFree);
     336             : extern TupleTableSlot *ExecStoreVirtualTuple(TupleTableSlot *slot);
     337             : extern TupleTableSlot *ExecStoreAllNullTuple(TupleTableSlot *slot);
     338             : extern void ExecStoreHeapTupleDatum(Datum data, TupleTableSlot *slot);
     339             : extern HeapTuple ExecFetchSlotHeapTuple(TupleTableSlot *slot, bool materialize, bool *shouldFree);
     340             : extern MinimalTuple ExecFetchSlotMinimalTuple(TupleTableSlot *slot,
     341             :                                               bool *shouldFree);
     342             : extern Datum ExecFetchSlotHeapTupleDatum(TupleTableSlot *slot);
     343             : extern void slot_getmissingattrs(TupleTableSlot *slot, int startAttNum,
     344             :                                  int lastAttNum);
     345             : extern void slot_getsomeattrs_int(TupleTableSlot *slot, int attnum);
     346             : 
     347             : 
     348             : #ifndef FRONTEND
     349             : 
     350             : /*
     351             :  * This function forces the entries of the slot's Datum/isnull arrays to be
     352             :  * valid at least up through the attnum'th entry.
     353             :  */
     354             : static inline void
     355   195242166 : slot_getsomeattrs(TupleTableSlot *slot, int attnum)
     356             : {
     357   195242166 :     if (slot->tts_nvalid < attnum)
     358   155184826 :         slot_getsomeattrs_int(slot, attnum);
     359   195242166 : }
     360             : 
     361             : /*
     362             :  * slot_getallattrs
     363             :  *      This function forces all the entries of the slot's Datum/isnull
     364             :  *      arrays to be valid.  The caller may then extract data directly
     365             :  *      from those arrays instead of using slot_getattr.
     366             :  */
     367             : static inline void
     368    15293468 : slot_getallattrs(TupleTableSlot *slot)
     369             : {
     370    15293468 :     slot_getsomeattrs(slot, slot->tts_tupleDescriptor->natts);
     371    15293468 : }
     372             : 
     373             : 
     374             : /*
     375             :  * slot_attisnull
     376             :  *
     377             :  * Detect whether an attribute of the slot is null, without actually fetching
     378             :  * it.
     379             :  */
     380             : static inline bool
     381     8579048 : slot_attisnull(TupleTableSlot *slot, int attnum)
     382             : {
     383             :     Assert(attnum > 0);
     384             : 
     385     8579048 :     if (attnum > slot->tts_nvalid)
     386     6699406 :         slot_getsomeattrs(slot, attnum);
     387             : 
     388     8579048 :     return slot->tts_isnull[attnum - 1];
     389             : }
     390             : 
     391             : /*
     392             :  * slot_getattr - fetch one attribute of the slot's contents.
     393             :  */
     394             : static inline Datum
     395    77636682 : slot_getattr(TupleTableSlot *slot, int attnum,
     396             :              bool *isnull)
     397             : {
     398             :     Assert(attnum > 0);
     399             : 
     400    77636682 :     if (attnum > slot->tts_nvalid)
     401    50929310 :         slot_getsomeattrs(slot, attnum);
     402             : 
     403    77636682 :     *isnull = slot->tts_isnull[attnum - 1];
     404             : 
     405    77636682 :     return slot->tts_values[attnum - 1];
     406             : }
     407             : 
     408             : /*
     409             :  * slot_getsysattr - fetch a system attribute of the slot's current tuple.
     410             :  *
     411             :  *  If the slot type does not contain system attributes, this will throw an
     412             :  *  error.  Hence before calling this function, callers should make sure that
     413             :  *  the slot type is the one that supports system attributes.
     414             :  */
     415             : static inline Datum
     416     6525376 : slot_getsysattr(TupleTableSlot *slot, int attnum, bool *isnull)
     417             : {
     418             :     Assert(attnum < 0);          /* caller error */
     419             : 
     420     6525376 :     if (attnum == TableOidAttributeNumber)
     421             :     {
     422     2239600 :         *isnull = false;
     423     2239600 :         return ObjectIdGetDatum(slot->tts_tableOid);
     424             :     }
     425     4285776 :     else if (attnum == SelfItemPointerAttributeNumber)
     426             :     {
     427     4285360 :         *isnull = false;
     428     4285360 :         return PointerGetDatum(&slot->tts_tid);
     429             :     }
     430             : 
     431             :     /* Fetch the system attribute from the underlying tuple. */
     432         416 :     return slot->tts_ops->getsysattr(slot, attnum, isnull);
     433             : }
     434             : 
     435             : /*
     436             :  * slot_is_current_xact_tuple - check if the slot's current tuple is created
     437             :  *                              by the current transaction.
     438             :  *
     439             :  *  If the slot does not contain a storage tuple, this will throw an error.
     440             :  *  Hence before calling this function, callers should make sure that the
     441             :  *  slot type supports storage tuples and that there is currently one inside
     442             :  *  the slot.
     443             :  */
     444             : static inline bool
     445         912 : slot_is_current_xact_tuple(TupleTableSlot *slot)
     446             : {
     447         912 :     return slot->tts_ops->is_current_xact_tuple(slot);
     448             : }
     449             : 
     450             : /*
     451             :  * ExecClearTuple - clear the slot's contents
     452             :  */
     453             : static inline TupleTableSlot *
     454   136473866 : ExecClearTuple(TupleTableSlot *slot)
     455             : {
     456   136473866 :     slot->tts_ops->clear(slot);
     457             : 
     458   136473866 :     return slot;
     459             : }
     460             : 
     461             : /* ExecMaterializeSlot - force a slot into the "materialized" state.
     462             :  *
     463             :  * This causes the slot's tuple to be a local copy not dependent on any
     464             :  * external storage (i.e. pointing into a Buffer, or having allocations in
     465             :  * another memory context).
     466             :  *
     467             :  * A typical use for this operation is to prepare a computed tuple for being
     468             :  * stored on disk.  The original data may or may not be virtual, but in any
     469             :  * case we need a private copy for heap_insert to scribble on.
     470             :  */
     471             : static inline void
     472    14852044 : ExecMaterializeSlot(TupleTableSlot *slot)
     473             : {
     474    14852044 :     slot->tts_ops->materialize(slot);
     475    14852044 : }
     476             : 
     477             : /*
     478             :  * ExecCopySlotHeapTuple - return HeapTuple allocated in caller's context
     479             :  */
     480             : static inline HeapTuple
     481    19562986 : ExecCopySlotHeapTuple(TupleTableSlot *slot)
     482             : {
     483             :     Assert(!TTS_EMPTY(slot));
     484             : 
     485    19562986 :     return slot->tts_ops->copy_heap_tuple(slot);
     486             : }
     487             : 
     488             : /*
     489             :  * ExecCopySlotMinimalTuple - return MinimalTuple allocated in caller's context
     490             :  */
     491             : static inline MinimalTuple
     492    15405510 : ExecCopySlotMinimalTuple(TupleTableSlot *slot)
     493             : {
     494    15405510 :     return slot->tts_ops->copy_minimal_tuple(slot);
     495             : }
     496             : 
     497             : /*
     498             :  * ExecCopySlot - copy one slot's contents into another.
     499             :  *
     500             :  * If a source's system attributes are supposed to be accessed in the target
     501             :  * slot, the target slot and source slot types need to match.
     502             :  *
     503             :  * Currently, 'dstslot' and 'srcslot' must have the same number of attributes.
     504             :  * Future work could see this relaxed to allow the source to contain
     505             :  * additional attributes and have the code here only copy over the leading
     506             :  * attributes.
     507             :  */
     508             : static inline TupleTableSlot *
     509    11761028 : ExecCopySlot(TupleTableSlot *dstslot, TupleTableSlot *srcslot)
     510             : {
     511             :     Assert(!TTS_EMPTY(srcslot));
     512             :     Assert(srcslot != dstslot);
     513             :     Assert(dstslot->tts_tupleDescriptor->natts ==
     514             :            srcslot->tts_tupleDescriptor->natts);
     515             : 
     516    11761028 :     dstslot->tts_ops->copyslot(dstslot, srcslot);
     517             : 
     518    11761028 :     return dstslot;
     519             : }
     520             : 
     521             : #endif                          /* FRONTEND */
     522             : 
     523             : #endif                          /* TUPTABLE_H */

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