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Tomas Vondra 8f321bd16c Use functional dependencies to estimate ScalarArrayOpExpr ... Until now functional dependencies supported only simple equality clauses and clauses that can be trivially translated to equalities. This commit allows estimation of some ScalarArrayOpExpr (IN/ANY) clauses. For IN clauses we can do this thanks to using operator with equality semantics, which means an IN clause WHERE c IN (1, 2, ..., N) can be translated to WHERE (c = 1 OR c = 2 OR ... OR c = N) IN clauses are now considered compatible with functional dependencies, and rely on the same assumption of consistency of queries with data (which is an assumption we already used for simple equality clauses). This applies also to ALL clauses with an equality operator, which can be considered equivalent to IN clause. ALL clauses are still considered incompatible, although there's some discussion about maybe relaxing this in the future. Author: Pierre Ducroquet Reviewed-by: Tomas Vondra, Dean Rasheed Discussion: https://www.postgresql.org/message-id/flat/13902317.Eha0YfKkKy%40pierred-pdoc		6 years ago
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src	Use functional dependencies to estimate ScalarArrayOpExpr	6 years ago
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