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Fixed mdev-14911: zero_date is considered as NULL, depending on
optimizer_switch For DATE and DATETIME columns defined as NOT NULL, "date_notnull IS NULL" has to be modified to: "date_notnull IS NULL OR date_notnull == 0" if date_notnull is from an inner table of outer join); "date_notnull == 0" - otherwise. This must hold for such columns of mergeable views and derived tables as well. So far the code did the above re-writing only for columns of base tables and temporary tables.
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