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Use multi-variate MCV lists to estimate ScalarArrayOpExpr

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Commit 8f321bd16c added support for estimating ScalarArrayOpExpr clauses
(IN/ANY) clauses using functional dependencies. There's no good reason
not to support estimation of these clauses using multi-variate MCV lists
too, so this commits implements that. That makes the behavior consistent
and MCV lists can estimate all variants (ANY/ALL, inequalities, ...).

Author: Tomas Vondra
Review: Dean Rasheed
Discussion: https://www.postgresql.org/message-id/flat/13902317.Eha0YfKkKy%40pierred-pdoc
This commit is contained in:
Tomas Vondra
2020-03-14 14:56:37 +01:00
parent 8f321bd16c
commit e83daa7e33
5 changed files with 252 additions and 9 deletions
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4
src/include/statistics/extended_stats_internal.h
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@ -96,8 +96,8 @@ extern SortItem *build_sorted_items(int numrows, int *nitems, HeapTuple *rows,
TupleDesc tdesc, MultiSortSupport mss,
int numattrs, AttrNumber *attnums);
extern bool examine_opclause_expression(OpExpr *expr, Var **varp,
Const **cstp, bool *varonleftp);
extern bool examine_clause_args(List *args, Var **varp,
Const **cstp, bool *varonleftp);
extern Selectivity mcv_clauselist_selectivity(PlannerInfo *root,
StatisticExtInfo *stat,