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  1. Hive
  2. HIVE-2327

Optimize REGEX UDFs with constant parameter information

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.3.0, 2.0.0
    • Component/s: UDF
    • Labels:
      None

      Description

      There are a lot of UDFs which would show major performance differences if one assumes that some of its arguments are constant.

      Consider, for example, any UDF that takes a regular expression as input: This can be complied once (fast) if it's a constant, or once per row (wicked slow) if it's not a constant.

      Or, consider any UDF that reads from a file and/or takes a filename as input; it would have to re-read the whole file if the filename changes.

        Attachments

        1. HIVE-2327.2.patch
          34 kB
          Alexander Pivovarov
        2. HIVE-2327.01.patch
          17 kB
          Alexander Pivovarov

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              • Assignee:
                apivovarov Alexander Pivovarov
                Reporter:
                akramer Adam Kramer
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                Dates

                • Created:
                  Updated:
                  Resolved: