Alexander Barkov 56a3496067 MDEV-10236 Where expression with NOT function gives incorrect result ...

Item_cache::is_null() erroneously returned null_value in a
non-cached state. Now Item_cache::is_null() uses has_value(),
which caches the value if not cached yet, similar to what other value methods do
(e.g. val_int, val_real, etc).

2016-06-28 13:11:04 +04:00

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