[GitHub] vrozov commented on a change in pull request #1349: DRILL-6554: Minor code improvements in parquet statistics handling

[GitBox <gi...@apache.org>]

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_r199204147
 
 

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 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:
   When can rowCount be negative?

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