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Replace TupleTableSlot convention for whole-row variables and function

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results with tuples as ordinary varlena Datums.  This commit does not
in itself do much for us, except eliminate the horrid memory leak
associated with evaluation of whole-row variables.  However, it lays the
groundwork for allowing composite types as table columns, and perhaps
some other useful features as well.  Per my proposal of a few days ago.
This commit is contained in:
Tom Lane
2004-04-01 21:28:47 +00:00
parent 8590a62b75
commit 375369acd1
60 changed files with 1779 additions and 1733 deletions
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61
src/backend/executor/execTuples.c
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@ -15,7 +15,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.75 2004/01/07 18:56:26 neilc Exp $
* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.76 2004/04/01 21:28:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -109,8 +109,11 @@
#include "funcapi.h"
#include "access/heapam.h"
#include "catalog/pg_type.h"
#include "executor/executor.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"
static TupleDesc ExecTypeFromTLInternal(List *targetList,
bool hasoid, bool skipjunk);
@ -144,16 +147,11 @@ ExecCreateTupleTable(int initialSize) /* initial number of slots in
/*
* Now allocate our new table along with space for the pointers to the
* tuples.
* tuples. Zero out the slots.
*/
newtable = (TupleTable) palloc(sizeof(TupleTableData));
array = (TupleTableSlot *) palloc(initialSize * sizeof(TupleTableSlot));
/*
* clean out the slots we just allocated
*/
MemSet(array, 0, initialSize * sizeof(TupleTableSlot));
array = (TupleTableSlot *) palloc0(initialSize * sizeof(TupleTableSlot));
/*
* initialize the new table and return it to the caller.
@ -514,6 +512,10 @@ TupleTableSlot *
ExecInitNullTupleSlot(EState *estate, TupleDesc tupType)
{
TupleTableSlot *slot = ExecInitExtraTupleSlot(estate);
struct tupleDesc nullTupleDesc;
HeapTuple nullTuple;
Datum values[1];
char nulls[1];
/*
* Since heap_getattr() will treat attributes beyond a tuple's t_natts
@ -521,16 +523,13 @@ ExecInitNullTupleSlot(EState *estate, TupleDesc tupType)
* of zero length. However, the slot descriptor must match the real
* tupType.
*/
HeapTuple nullTuple;
Datum values[1];
char nulls[1];
static struct tupleDesc NullTupleDesc; /* we assume this inits to
* zeroes */
nullTupleDesc = *tupType;
nullTupleDesc.natts = 0;
nullTuple = heap_formtuple(&nullTupleDesc, values, nulls);
ExecSetSlotDescriptor(slot, tupType, false);
nullTuple = heap_formtuple(&NullTupleDesc, values, nulls);
return ExecStoreTuple(nullTuple, slot, InvalidBuffer, true);
}
@ -590,21 +589,45 @@ ExecTypeFromTLInternal(List *targetList, bool hasoid, bool skipjunk)
resdom->resname,
resdom->restype,
resdom->restypmod,
0,
false);
0);
}
return typeInfo;
}
/*
* BlessTupleDesc - make a completed tuple descriptor useful for SRFs
*
* Rowtype Datums returned by a function must contain valid type information.
* This happens "for free" if the tupdesc came from a relcache entry, but
* not if we have manufactured a tupdesc for a transient RECORD datatype.
* In that case we have to notify typcache.c of the existence of the type.
*/
TupleDesc
BlessTupleDesc(TupleDesc tupdesc)
{
if (tupdesc->tdtypeid == RECORDOID &&
tupdesc->tdtypmod < 0)
assign_record_type_typmod(tupdesc);
return tupdesc; /* just for notational convenience */
}
/*
* TupleDescGetSlot - Initialize a slot based on the supplied tupledesc
*
* Note: this is obsolete; it is sufficient to call BlessTupleDesc on
* the tupdesc. We keep it around just for backwards compatibility with
* existing user-written SRFs.
*/
TupleTableSlot *
TupleDescGetSlot(TupleDesc tupdesc)
{
TupleTableSlot *slot;
/* The useful work is here */
BlessTupleDesc(tupdesc);
/* Make a standalone slot */
slot = MakeTupleTableSlot();
@ -634,6 +657,9 @@ TupleDescGetAttInMetadata(TupleDesc tupdesc)
attinmeta = (AttInMetadata *) palloc(sizeof(AttInMetadata));
/* "Bless" the tupledesc so that we can make rowtype datums with it */
attinmeta->tupdesc = BlessTupleDesc(tupdesc);
/*
* Gather info needed later to call the "in" function for each
* attribute
@ -653,7 +679,6 @@ TupleDescGetAttInMetadata(TupleDesc tupdesc)
atttypmods[i] = tupdesc->attrs[i]->atttypmod;
}
}
attinmeta->tupdesc = tupdesc;
attinmeta->attinfuncs = attinfuncinfo;
attinmeta->attelems = attelems;
attinmeta->atttypmods = atttypmods;