[jira] [Created] (HIVE-4878) With Dynamic partitioning, some queries would scan default partition even if query is not using it.

["Laljo John Pullokkaran (JIRA)" <ji...@apache.org>]

Laljo John Pullokkaran created HIVE-4878:
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             Summary: With Dynamic partitioning, some queries would scan default partition even if query is not using it.
                 Key: HIVE-4878
                 URL: https://issues.apache.org/jira/browse/HIVE-4878
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.11.0
            Reporter: Laljo John Pullokkaran
            Assignee: Laljo John Pullokkaran
             Fix For: 0.11.1


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.



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