amansinha100 commented on a change in pull request #729: Drill 1328: Support
table statistics for Parquet
URL: https://github.com/apache/drill/pull/729#discussion_r259152124
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File path:
exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java
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@@ -911,4 +911,38 @@ public static String bootDefaultFor(String name) {
new OptionDescription("Controls whether to return result set for CREATE
TABLE / VIEW / FUNCTION, DROP TABLE / VIEW / FUNCTION, " +
"SET, USE, REFRESH METADATA TABLE queries. If set to false affected
rows count will be returned instead and result set will be null. " +
"Affects JDBC connections only. Default is true. (Drill 1.15+)"));
+
+ /**
+ * Option whose value is a long value representing the number of bits
required for computing ndv (using HLL).
+ * Controls the trade-off between accuracy and memory requirements. The
number of bits correlates positively with accuracy
+ */
+ public static final String HLL_ACCURACY = "exec.statistics.ndv_accuracy";
+ public static final LongValidator HLL_ACCURACY_VALIDATOR = new
PositiveLongValidator(HLL_ACCURACY, 30,
+ new OptionDescription("Controls trade-off between NDV statistic
computation memory cost and accuracy"));
+
+ /**
+ * Option whose value is a long value representing the number of bits
required for computing ndv (using HLL).
Review comment:
Comment needs to be updated.
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