vrozov commented on a change in pull request #1387: DRILL-6603: Set num_nulls
for parquet statistics to -1 when actual number is not defined.
URL: https://github.com/apache/drill/pull/1387#discussion_r203543266
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetPredicatesHelper.java
##########
@@ -48,13 +48,19 @@ static boolean isAllNulls(Statistics stat, long rowCount) {
}
/**
- * Checks that column chunk's statistics does not have nulls
+ * Checks that column chunk's statistics does not have nulls.
+ *
+ * <ul>
+ * <li>If number of nulls is more then 0, it means column has nulls.</li>
+ * <li>If number of nulls is less then zero (usually -1), it means that
stats are unavailable.</li>
Review comment:
Please see the documentation for `getNumNulls()`. In case the number of
nulls is not set it is `-1`.
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