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  1. MariaDB Server
  2. MDEV-4758

10.0-monty tree: ALTER TABLE CHANGE COLUMN doesn't drop EITS stats

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
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      Description

      A statement

      ALTER TABLE t1 CHANGE COLUMN b x varchar(30)

      used to drop column's statistics in Engine-Independent Table Statistics.
      In current 10.0-monty, the EITS entry is not dropped, which causes a failure in mysql-test/t/statistics.test which looks like this:

      CURRENT_TEST: main.statistics
      mysqltest: At line 280: query 'LOAD DATA INFILE '$MYSQLTEST_VARDIR/tmp/save_column_stats'
        INTO TABLE mysql.column_stats
      FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n'' failed: 1062: Duplicate entry 'test-t1-b' for key 'PRIMARY'

      I guess, ALTER TABLE code merge went wrong somewhere.

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              Assignee:
              serg Sergei Golubchik
              Reporter:
              psergei Sergei Petrunia
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                Updated:
                Resolved:

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