Fix for BUG#13419: In "ref" optimizer, take into account that item=Item_func_in(x,y) is
not equivalent to "x=y" when item->negated == TRUE. mysql-test/r/func_in.result: Testcase for BUG#13419 mysql-test/t/func_in.test: Testcase for BUG#13419 sql/sql_select.cc: Fix for BUG#13419: * Take into account that item=Item_func_in(x,y) is not equivalent to "x=y" when item->negated == TRUE. * Removed comment that is no longer true.
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