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  1. IMPALA
  2. IMPALA-1607

Altering a column's type causes column stats to stop sticking for that column

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Blocker
    • Resolution: Not A Bug
    • Affects Version/s: Impala 2.1
    • Fix Version/s: Impala 2.2
    • Component/s: None

      Description

      Changing a column's type by ALTER TABLE CHANGE ... leads to column stats for that column failing to persist.

      Therefore every COMPUTE INCREMENTAL STATS after that turn into a full scan, because Impala believes the column doesn't have stats and needs to rescan the table, not to mention the fact that the statistics on that column are permanently wrong.

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            • Assignee:
              henryr Henry Robinson
              Reporter:
              henryr Henry Robinson
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              Dates

              • Created:
                Updated:
                Resolved: