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in queries like create view v1 as select 2 like 1 escape (3 in (select 0 union select 1)); select 2 union select * from v1; Item_func_like::escape was left uninitialized, because Item_in_optimizer is const_during_execution() but not actually const_item() during execution. It's not, because const subquery evaluation was disabled for derived. Practically it only needs to be disabled for multi-update that runs fix_fields() before all tables are locked. |
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