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Back-patch fix to prevent core dump in EXPLAIN if optimizer has

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simplified function call to a constant.  (7.3 won't actually execute
such a plan anyway, but core dump is bad regardless.)
This commit is contained in:
Tom Lane
2002-12-12 16:16:58 +00:00
parent 20606b46fd
commit 68df4f7ca8
1 changed files with 16 additions and 7 deletions
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23
src/backend/commands/explain.c
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@@ -5,7 +5,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.89.2.1 2002/12/06 19:28:13 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.89.2.2 2002/12/12 16:16:58 tgl Exp $
*
*/
@@ -367,19 +367,28 @@ explain_outNode(StringInfo str, Plan *plan, Plan *outer_plan,
RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
es->rtable);
Expr *expr;
Func *funcnode;
Oid funcid;
char *proname;
/* Assert it's on a RangeFunction */
Assert(rte->rtekind == RTE_FUNCTION);
/*
* If the expression is still a function call, we can get
* the real name of the function. Otherwise, punt (this
* can happen if the optimizer simplified away the function
* call, for example).
*/
expr = (Expr *) rte->funcexpr;
funcnode = (Func *) expr->oper;
funcid = funcnode->funcid;
if (expr && IsA(expr, Expr) && expr->opType == FUNC_EXPR)
{
Func *funcnode = (Func *) expr->oper;
Oid funcid = funcnode->funcid;
/* We only show the func name, not schema name */
proname = get_func_name(funcid);
/* We only show the func name, not schema name */
proname = get_func_name(funcid);
}
else
proname = rte->eref->aliasname;
appendStringInfo(str, " on %s",
quote_identifier(proname));