SHOW COLUMNS and SHOW INDEX don't resolve qualified table names. #2200
Description
SHOW COLUMNS and SHOW INDEX don't resolve qualified table names.
in test613.js i tried to use qualitfied table names, but it returns empty array [] instead of column/index metadata.
Works with unqualified names + USE context, fails with qualified names.
Root cause: Metadata commands don't parse qualified names correctly.
Needs parser/executor updates similar to how SELECT handles qualified names.