Github user gparai commented on a diff in the pull request: https://github.com/apache/drill/pull/729#discussion_r103608235 --- 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 -- Also, the version in the option will change to the latest for any changes to the statistics. However, this option will give users flexibility for scenarios described in the earlier commit.
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