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Add some comments about why function parameter default expressions are

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restricted.
This commit is contained in:
Tom Lane
2009-01-06 02:01:27 +00:00
parent 10374a34c6
commit 9f910a3b9a
1 changed files with 9 additions and 1 deletions
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10
src/backend/commands/functioncmds.c
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@ -10,7 +10,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/functioncmds.c,v 1.106 2009/01/01 17:23:38 momjian Exp $ * $PostgreSQL: pgsql/src/backend/commands/functioncmds.c,v 1.107 2009/01/06 02:01:27 tgl Exp $
* *
* DESCRIPTION * DESCRIPTION
* These routines take the parse tree and pick out the * These routines take the parse tree and pick out the
@ -311,7 +311,15 @@ examine_parameter_list(List *parameters, Oid languageOid,
errmsg("cannot use table references in parameter default value"))); errmsg("cannot use table references in parameter default value")));
/* /*
* It can't return a set either --- but coerce_to_specific_type
* already checked that for us.
*
* No subplans or aggregates, either... * No subplans or aggregates, either...
*
* Note: the point of these restrictions is to ensure that an
* expression that, on its face, hasn't got subplans, aggregates,
* etc cannot suddenly have them after function default arguments
* are inserted.
*/ */
if (pstate->p_hasSubLinks) if (pstate->p_hasSubLinks)
ereport(ERROR, ereport(ERROR,