vrozov commented on a change in pull request #1349: DRILL-6554: Minor code
improvements in parquet statistics handling
URL: https://github.com/apache/drill/pull/1349#discussion_r199208654
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetPredicatesHelper.java
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@@ -39,22 +40,21 @@ static boolean isNullOrEmpty(Statistics stat) {
*
* @param stat parquet column statistics
* @param rowCount number of rows in the parquet file
- * @return True if all rows are null in the parquet file
- * False if at least one row is not null.
+ * @return <tt>true</tt> if all rows are null in the parquet file and
<tt>false</tt> otherwise
*/
static boolean isAllNulls(Statistics stat, long rowCount) {
- return stat.isNumNullsSet() && stat.getNumNulls() == rowCount;
+ Preconditions.checkArgument(rowCount >= 0, String.format("negative
rowCount %d is not valid", rowCount));
Review comment:
To validate input. It can't give the correct answer if an input is a junk
(`rowCount` is negative).
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