Fix bug #11864 non unique names are allowed in subquery
Column names weren't checked for uniqueness for subqueries. Code for names uniqueness checking used for view creation moved into separate function named check_duplicate_names(). It's called on preparation of subqueries to check uniqueness of names. If duplicate names are found then error is raised. sql/sql_derived.cc: Fix bug #11864 non unique names are allowed in subquery Added check for names uniqueness in select list. sql/sql_view.cc: Fix bug #11864 non unique names are allowed in subquery Code for checking uniqueness of names in item list moved into separate function to make in available for use from other places. sql/sql_view.h: Fix bug #11864 non unique names are allowed in subquery Added check_duplicate_names() function prototype. mysql-test/t/derived.test: Fixed test case results after bug fix #11864 Added test case for bug#11864 non unique names are allowed in subquery. mysql-test/t/select_safe.test: Fixed test case results after bug fix #11864 mysql-test/r/derived.result: Added test case for bug #11864 non unique names are allowed in subquery. Fixed test case results after bug fix #11864 mysql-test/r/select_safe.result: Fixed test case results after bug fix #11864
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