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Cast functions can be immutable or stable.

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This commit is contained in:
Peter Eisentraut 2002-09-15 13:04:16 +00:00
parent db4f3c0334
commit 5ea9322872
2 changed files with 5 additions and 5 deletions
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4
doc/src/sgml/ref/create_cast.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_cast.sgml,v 1.3 2002/09/01 02:37:02 tgl Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_cast.sgml,v 1.4 2002/09/15 13:04:16 petere Exp $ -->
<refentry id="SQL-CREATECAST">
<refmeta>
@ -117,7 +117,7 @@ INSERT INTO foo(f1) VALUES(42);
be schema-qualified. If it is not, the function will be looked
up in the path. The argument type must be identical to the
source type, the result data type must match the target type of
the cast. Cast functions must be marked immutable.
the cast. Cast functions must be marked immutable or stable.
</para>
</listitem>
</varlistentry>

6
src/backend/commands/functioncmds.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.19 2002/09/04 20:31:15 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.20 2002/09/15 13:04:16 petere Exp $
*
* DESCRIPTION
* These routines take the parse tree and pick out the
@ -676,8 +676,8 @@ CreateCast(CreateCastStmt *stmt)
elog(ERROR, "argument of cast function must match source data type");
if (procstruct->prorettype != targettypeid)
elog(ERROR, "return data type of cast function must match target data type");
if (procstruct->provolatile != PROVOLATILE_IMMUTABLE)
elog(ERROR, "cast function must be immutable");
if (procstruct->provolatile == PROVOLATILE_VOLATILE)
elog(ERROR, "cast function must not be volatile");
if (procstruct->proisagg)
elog(ERROR, "cast function must not be an aggregate function");
if (procstruct->proretset)