Chunchun Ye b131895fc2 feat(flightsql): Support `GetPrimaryKeys` metadata endpoint with an empty RecordBatch (#7496) ... * feat: add CommandGetPrimaryKeys metadata endpoint and tests * chore: update schema for the returned record batch --------- Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>		2023-04-11 14:13:44 +00:00
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