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  1. MariaDB Server
  2. MDEV-19990

JOIN USING not behaving like 'equals'

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    Description

      Since 10.3 (I believe), the following query returns EMPTY set:

      SELECT k.TABLE_NAME, k.COLUMN_NAME, k.CONSTRAINT_NAME, k.REFERENCED_TABLE_NAME, k.REFERENCED_COLUMN_NAME, r.DELETE_RULE, r.UPDATE_RULE FROM information_schema.REFERENTIAL_CONSTRAINTS r JOIN information_schema.KEY_COLUMN_USAGE k USING (CONSTRAINT_CATALOG, CONSTRAINT_SCHEMA, CONSTRAINT_NAME)

      But if I expand the USING into 'equals', it returns proper results:

      SELECT k.TABLE_NAME, k.COLUMN_NAME, k.CONSTRAINT_NAME, k.REFERENCED_TABLE_NAME, k.REFERENCED_COLUMN_NAME, r.DELETE_RULE, r.UPDATE_RULE FROM information_schema.REFERENTIAL_CONSTRAINTS r JOIN information_schema.KEY_COLUMN_USAGE k on r.CONSTRAINT_CATALOG = k.CONSTRAINT_CATALOG and r.CONSTRAINT_SCHEMA = k.CONSTRAINT_SCHEMA and r.CONSTRAINT_NAME = k.CONSTRAINT_NAME

      Tried with "root" and local user.
      Before, it was always returning results with USING.

      I would expect that USING works exactly the same with 'equals' ?

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21201 No records produced in information_schema query, depending on projection

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              varun Varun Gupta (Inactive)
              nunop Nuno
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                Updated:
                Resolved:

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