Dept of second thoughts: the IQ of estimate_array_length() needs to be
kept on par with that of scalararraysel(), else estimates that should track might not. Hence teach it about binary-compatible cases, too.
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@ -15,7 +15,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/selfuncs.c,v 1.222 2007/01/28 01:37:38 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/selfuncs.c,v 1.223 2007/01/28 02:53:34 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -1698,6 +1698,9 @@ scalararraysel(PlannerInfo *root,
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int
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estimate_array_length(Node *arrayexpr)
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{
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/* look through any binary-compatible relabeling of arrayexpr */
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arrayexpr = strip_array_coercion(arrayexpr);
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if (arrayexpr && IsA(arrayexpr, Const))
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{
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Datum arraydatum = ((Const *) arrayexpr)->constvalue;
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