vrozov commented on a change in pull request #1298: DRILL-5796: Filter pruning 
for multi rowgroup parquet file
URL: https://github.com/apache/drill/pull/1298#discussion_r198882619
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetComparisonPredicate.java
 ##########
 @@ -83,23 +84,26 @@ private ParquetComparisonPredicate(
    * where Column1 and Column2 are from same parquet table.
    */
   @Override
-  public boolean canDrop(RangeExprEvaluator<C> evaluator) {
+  public RowsMatch matches(RangeExprEvaluator<C> evaluator) {
     Statistics<C> leftStat = left.accept(evaluator, null);
-    if (isNullOrEmpty(leftStat)) {
-      return false;
+    if (isNullOrEmpty(leftStat) || !leftStat.hasNonNullValue()) {
+      return RowsMatch.SOME;
     }
-
     Statistics<C> rightStat = right.accept(evaluator, null);
-    if (isNullOrEmpty(rightStat)) {
-      return false;
+    if (isNullOrEmpty(rightStat) || !rightStat.hasNonNullValue()) {
+      return RowsMatch.SOME;
     }
-
-    // if either side is ALL null, = is evaluated to UNKNOWN -> canDrop
     if (isAllNulls(leftStat, evaluator.getRowCount()) || isAllNulls(rightStat, 
evaluator.getRowCount())) {
-      return true;
+        return RowsMatch.NONE;
 
 Review comment:
   check formatting. There seems to be an extra indent.

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