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

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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
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@ -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>