Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.8.0
    • Component/s: Query Processor
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      This patch adds support for the 'TABLESAMPLE(x PERCENT)' clause.

      Description

      We need a better input sampling to serve at least two purposes:
      1. test their queries against a smaller data set
      2. understand more about how the data look like without scanning the whole table.
      A simple function that gives a subset splits will help in those cases. It doesn't have to be strict sampling.

        Attachments

        1. HIVE-2121.1.patch
          37 kB
          Siying Dong
        2. HIVE-2121.2.patch
          208 kB
          Siying Dong
        3. HIVE-2121.3.patch
          210 kB
          Siying Dong
        4. HIVE-2121.4.patch
          209 kB
          Siying Dong
        5. HIVE-2121.5.patch
          218 kB
          Siying Dong
        6. HIVE-2121.6.patch
          266 kB
          Siying Dong
        7. HIVE-2121.7.patch
          266 kB
          Siying Dong
        8. HIVE-2121.8.patch
          754 kB
          Siying Dong

          Activity

            People

            • Assignee:
              sdong Siying Dong
              Reporter:
              sdong Siying Dong
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              Dates

              • Created:
                Updated:
                Resolved: