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Commit1f5ca04

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Disallow aggregate functions in UPDATE commands (unless within a sub-SELECT).
This is disallowed by the SQL spec because it doesn't have any very sensibleinterpretation. Historically Postgres has allowed it but behaved strangely.As of PG 8.1 a server crash is possible if the MIN/MAX index optimization getsapplied; rather than try to "fix" that, it seems best to just enforce thespec restriction. Per report from Josh Drake and Alvaro Herrera.
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‎src/backend/parser/analyze.c

Lines changed: 11 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*$PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.334 2006/04/30 18:30:39 tgl Exp $
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*$PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.335 2006/06/21 18:30:11 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -1613,7 +1613,7 @@ transformRuleStmt(ParseState *pstate, RuleStmt *stmt,
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if (pstate->p_hasAggs)
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ereport(ERROR,
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(errcode(ERRCODE_GROUPING_ERROR),
1616-
errmsg("rule WHERE condition may not contain aggregate functions")));
1616+
errmsg("cannot use aggregate function in rule WHERE condition")));
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/* save info about sublinks in where clause */
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qry->hasSubLinks=pstate->p_hasSubLinks;
@@ -2346,9 +2346,16 @@ transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt)
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qry->jointree=makeFromExpr(pstate->p_joinlist,qual);
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qry->hasSubLinks=pstate->p_hasSubLinks;
2349-
qry->hasAggs=pstate->p_hasAggs;
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/*
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* Top-level aggregates are simply disallowed in UPDATE, per spec.
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* (From an implementation point of view, this is forced because the
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* implicit ctid reference would otherwise be an ungrouped variable.)
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*/
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if (pstate->p_hasAggs)
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parseCheckAggregates(pstate,qry);
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ereport(ERROR,
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(errcode(ERRCODE_GROUPING_ERROR),
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errmsg("cannot use aggregate function in UPDATE")));
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/*
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* Now we are done with SELECT-like processing, and can get on with

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