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Add a SPI_copytupledesc function that parallels SPI_copytuple --- ie, 

it copies the tupdesc into upper-executor memory.  This is necessary
for returning tuple descriptors without leaking all of lower exec memory.
This commit is contained in:
Tom Lane 2001-08-02 18:08:43 +00:00
parent ba4d223cd9
commit f59f3c8899
3 changed files with 165 additions and 18 deletions
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126
doc/src/sgml/spi.sgml
View File

@ -1229,6 +1229,121 @@ TBD
<!-- *********************************************** -->
<!-- *********************************************** -->
<REFENTRY ID="SPI-SPICOPYTUPLEDESC">
<REFMETA>
<REFENTRYTITLE>SPI_copytupledesc</REFENTRYTITLE>
<REFMISCINFO>SPI - Tuple Descriptor Copy</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>SPI_copytupledesc
</REFNAME>
<REFPURPOSE>
Makes copy of tuple descriptor in upper Executor context
</REFPURPOSE>
<INDEXTERM ID="IX-SPI-SPICOPYTUPLEDESC-1"><PRIMARY>SPI</PRIMARY><SECONDARY>copying tuple descriptors</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-SPI-SPICOPYTUPLEDESC-2"><PRIMARY>SPI_copytupledesc</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>2001-08-02</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
SPI_copytupledesc(<REPLACEABLE CLASS="PARAMETER">tupdesc</REPLACEABLE>)
</SYNOPSIS>
<REFSECT2 ID="R2-SPI-SPICOPYTUPLEDESC-1">
<REFSECT2INFO>
<DATE>2001-08-02</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
TupleDesc <REPLACEABLE CLASS="PARAMETER">tupdesc</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Input tuple descriptor to be copied
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
<REFSECT2 ID="R2-SPI-SPICOPYTUPLEDESC-2">
<REFSECT2INFO>
<DATE>2001-08-02</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
TupleDesc
</TERM>
<LISTITEM>
<PARA>
Copied tuple descriptor
<SimpleList>
<Member>
<ReturnValue>non-NULL</ReturnValue>
if <REPLACEABLE CLASS="PARAMETER">tupdesc</REPLACEABLE>
is not NULL and the copy was successful
</Member>
<Member>
<ReturnValue>NULL</ReturnValue>
only if <REPLACEABLE CLASS="PARAMETER">tupdesc</REPLACEABLE>
is NULL
</Member>
</SimpleList>
</para>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
</REFSYNOPSISDIV>
<REFSECT1 ID="R1-SPI-SPICOPYTUPLEDESC-1">
<REFSECT1INFO>
<DATE>2001-08-02</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA>
<FUNCTION>SPI_copytupledesc</FUNCTION>
makes a copy of tupdesc in upper Executor context. See the section on Memory Management.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-SPI-SPICOPYTUPLEDESC-2">
<TITLE>Usage
</TITLE>
<Para>
TBD
</PARA>
</REFSECT1>
<!--
<REFSECT1 ID="R1-SPI-SPICOPYTUPLEDESC-3">
<TITLE>Algorithm
</TITLE>
<PARA>
</PARA>
</REFSECT1>
-->
<!--
<REFSECT1 ID="R1-SPI-SPICOPYTUPLEDESC-4">
<TITLE>Structures
</TITLE>
<PARA>None
</PARA>
</REFSECT1>
-->
</REFENTRY>
<!-- *********************************************** -->
<!-- *********************************************** -->
<!-- *********************************************** -->
<REFENTRY ID="SPI-SPIMODIFYTUPLE">
<REFMETA>
<REFENTRYTITLE>SPI_modifytuple</REFENTRYTITLE>
@ -2647,10 +2762,13 @@ made in this context.
<Para>
After <Function>SPI_connect</Function> is called current context is the procedure's one. All
allocations made via <Function>palloc</Function>/<Function>repalloc</Function> or by SPI utility functions (except
for <Function>SPI_copytuple</Function>, <Function>SPI_modifytuple</Function>,
<Function>SPI_palloc</Function> and <Function>SPI_repalloc</Function>) are
After <Function>SPI_connect</Function> is called current context is the
procedure's one. All allocations made via
<Function>palloc</Function>/<Function>repalloc</Function> or by SPI utility
functions (except for <Function>SPI_copytuple</Function>,
<Function>SPI_copytupledesc</Function>,
<Function>SPI_modifytuple</Function>,
<Function>SPI_palloc</Function> and <Function>SPI_repalloc</Function>) are
made in this context.
</Para>

33
src/backend/executor/spi.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.56 2001/08/02 16:05:23 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.57 2001/08/02 18:08:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -333,6 +333,33 @@ SPI_copytuple(HeapTuple tuple)
return ctuple;
}
TupleDesc
SPI_copytupledesc(TupleDesc tupdesc)
{
MemoryContext oldcxt = NULL;
TupleDesc ctupdesc;
if (tupdesc == NULL)
{
SPI_result = SPI_ERROR_ARGUMENT;
return NULL;
}
if (_SPI_curid + 1 == _SPI_connected) /* connected */
{
if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
elog(FATAL, "SPI: stack corrupted");
oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
}
ctupdesc = CreateTupleDescCopy(tupdesc);
if (oldcxt)
MemoryContextSwitchTo(oldcxt);
return ctupdesc;
}
HeapTuple
SPI_modifytuple(Relation rel, HeapTuple tuple, int natts, int *attnum,
Datum *Values, char *Nulls)
@ -1232,7 +1259,7 @@ _SPI_end_call(bool procmem)
}
static bool
_SPI_checktuples()
_SPI_checktuples(void)
{
uint32 processed = _SPI_current->processed;
SPITupleTable *tuptable = _SPI_current->tuptable;
@ -1244,8 +1271,8 @@ _SPI_checktuples()
failed = true;
}
else
/* some tuples were processed */
{
/* some tuples were processed */
if (tuptable == NULL) /* spi_printtup was not called */
failed = true;
else if (processed != (tuptable->alloced - tuptable->free))

24
src/include/executor/spi.h
View File

@ -2,6 +2,7 @@
*
* spi.h
*
* $Id: spi.h,v 1.28 2001/08/02 18:08:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -48,17 +49,17 @@ typedef struct
HeapTuple *vals; /* tuples */
} SPITupleTable;
#define SPI_ERROR_CONNECT -1
#define SPI_ERROR_COPY -2
#define SPI_ERROR_OPUNKNOWN -3
#define SPI_ERROR_UNCONNECTED -4
#define SPI_ERROR_CURSOR -5
#define SPI_ERROR_ARGUMENT -6
#define SPI_ERROR_PARAM -7
#define SPI_ERROR_TRANSACTION -8
#define SPI_ERROR_NOATTRIBUTE -9
#define SPI_ERROR_NOOUTFUNC -10
#define SPI_ERROR_TYPUNKNOWN -11
#define SPI_ERROR_CONNECT (-1)
#define SPI_ERROR_COPY (-2)
#define SPI_ERROR_OPUNKNOWN (-3)
#define SPI_ERROR_UNCONNECTED (-4)
#define SPI_ERROR_CURSOR (-5)
#define SPI_ERROR_ARGUMENT (-6)
#define SPI_ERROR_PARAM (-7)
#define SPI_ERROR_TRANSACTION (-8)
#define SPI_ERROR_NOATTRIBUTE (-9)
#define SPI_ERROR_NOOUTFUNC (-10)
#define SPI_ERROR_TYPUNKNOWN (-11)
#define SPI_OK_CONNECT 1
#define SPI_OK_FINISH 2
@ -87,6 +88,7 @@ extern void *SPI_saveplan(void *plan);
extern int SPI_freeplan(void *plan);
extern HeapTuple SPI_copytuple(HeapTuple tuple);
extern TupleDesc SPI_copytupledesc(TupleDesc tupdesc);
extern HeapTuple SPI_modifytuple(Relation rel, HeapTuple tuple, int natts,
int *attnum, Datum *Values, char *Nulls);
extern int SPI_fnumber(TupleDesc tupdesc, char *fname);