Igor Babaev 6267be460a 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.

2018-01-15 11:19:14 -08:00

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