paul-rogers commented on a change in pull request #1955: DRILL-7491: Incorrect 
count() returned for complex types in parquet
URL: https://github.com/apache/drill/pull/1955#discussion_r368323139
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/physical/base/AbstractGroupScanWithMetadata.java
 ##########
 @@ -167,29 +167,46 @@ public boolean isMatchAllMetadata() {
    */
   @Override
   public long getColumnValueCount(SchemaPath column) {
-    long tableRowCount, colNulls;
-    Long nulls;
     ColumnStatistics<?> columnStats = 
getTableMetadata().getColumnStatistics(column);
-    ColumnStatistics<?> nonInterestingColStats = null;
-    if (columnStats == null) {
-      nonInterestingColStats = 
getNonInterestingColumnsMetadata().getColumnStatistics(column);
-    }
+    ColumnStatistics<?> nonInterestingColStats = columnStats == null
+        ? getNonInterestingColumnsMetadata().getColumnStatistics(column) : 
null;
 
+    long tableRowCount;
     if (columnStats != null) {
       tableRowCount = 
TableStatisticsKind.ROW_COUNT.getValue(getTableMetadata());
     } else if (nonInterestingColStats != null) {
       tableRowCount = 
TableStatisticsKind.ROW_COUNT.getValue(getNonInterestingColumnsMetadata());
 
 Review comment:
   HI @ihuzenko, thanks for the explanation. Very clear. In fact, I'd even 
suggest copying the details into the code somewhere to give future readers 
additional context. And, do we have a unit test that demonstrates this case? 
This seems like the kind of obscure issue that someone (such as me) could 
easily break at some point because the behavior is not obvious.. 

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