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From gparai <...@git.apache.org>
Subject [GitHub] drill pull request #729: Drill 1328: Support table statistics for Parquet
Date Thu, 09 Feb 2017 21:48:34 GMT
Github user gparai commented on a diff in the pull request:

    https://github.com/apache/drill/pull/729#discussion_r100420583
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java ---
    @@ -390,4 +391,15 @@
     
       String DYNAMIC_UDF_SUPPORT_ENABLED = "exec.udf.enable_dynamic_support";
       BooleanValidator DYNAMIC_UDF_SUPPORT_ENABLED_VALIDATOR = new BooleanValidator(DYNAMIC_UDF_SUPPORT_ENABLED,
true, true);
    +
    +  /**
    +   * Option whose value is a long value representing the number of bits required for
computing ndv (using HLL)
    +   */
    +  LongValidator NDV_MEMORY_LIMIT = new PositiveLongValidator("exec.statistics.ndv_memory_limit",
30, 20);
    +
    +  /**
    +   * Option whose value represents the current version of the statistics. Decreasing
the value will generate
    +   * the older version of statistics
    +   */
    +  LongValidator STATISTICS_VERSION = new NonNegativeLongValidator("exec.statistics.capability_version",
1, 1);
    --- End diff --
    
    Yes. By default, the stats version computed is the latest version. However, if the user
chooses to compute an older version (maybe the performance is not optimal) they can set this
option to an older version. When planning a query, Drill would interpret the statistics based
on the version in the stats file.


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