Hive
  1. Hive
  2. HIVE-4878

With Dynamic partitioning, some queries would scan default partition even if query is not using it.

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 0.11.0
    • Fix Version/s: 0.12.0
    • Component/s: Query Processor
    • Labels:
      None

      Description

      With Dynamic partitioning, Hive would scan default partitions in some cases even if query excludes it.

      As part of partition pruning, predicate is narrowed down to those pieces that involve partition columns only. This predicate is then evaluated with partition values to determine, if scan should include those partitions.

      But in some cases (like when comparing "_HIVE_DEFAULT_PARTITION_" to numeric data types) expression evaluation would fail and would return NULL instead of true/false. In such cases the partition is added to unknown partitions which is then subsequently scanned.

      1. HIVE-4878.patch
        23 kB
        Laljo John Pullokkaran

        Issue Links

          Activity

            People

            • Assignee:
              Laljo John Pullokkaran
              Reporter:
              Laljo John Pullokkaran
            • Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

                Development