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Ole John Aske authored
Fixed incorrect checks in join_read_const_table() for when to accept a non-existing, or empty const-row as a part of the const'ified set of tables. Intention of this test is to only accept NULL-rows if this table is outer joined into the resultset. (In case of an inner-join we can conclude at this point that resultset will be empty, end we want to return 'error' to signal this.) Initially 'maybe_null' is set to the same value as 'outer_join' in setup_table_map(), mysql_priv.h ~line 2424. Later simplify_joins() will attemp to replace outer joins by inner join whenever possible. This will cause 'outer_join' to be updated. However, 'maybe_null' is *not* updated to reflect this rewrite as this field is used to currectly set the 'nullability' property for the columns in the resultset. We should therefore change join_read_const_table() to check the 'outer_join' property instead of 'maybe_null', as this correctly reflect the nullability of the *execution plan* (not *resultset*).
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