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Commit07e6f93

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Fix oversight in 8.0 modification of RestrictInfo data structures.
A RestrictInfo representing an OR clause now contains two versions ofthe contained expression, one with sub-RestrictInfos and one without.clause_selectivity() should descend to the version with sub-RestrictInfosso that it has a chance of caching its results for the OR's sub-clauses.Failing to do so resulted in redundant planner effort.
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‎src/backend/optimizer/path/clausesel.c

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@@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/optimizer/path/clausesel.c,v 1.73 2005/06/05 22:32:55 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/optimizer/path/clausesel.c,v 1.74 2005/10/11 16:44:40 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -461,8 +461,15 @@ clause_selectivity(PlannerInfo *root,
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}
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}
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/* Proceed with examination of contained clause */
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clause= (Node*)rinfo->clause;
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/*
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* Proceed with examination of contained clause. If the clause is an
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* OR-clause, we want to look at the variant with sub-RestrictInfos,
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* so that per-subclause selectivities can be cached.
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*/
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if (rinfo->orclause)
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clause= (Node*)rinfo->orclause;
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else
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clause= (Node*)rinfo->clause;
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}
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if (IsA(clause,Var))

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