vrozov commented on a change in pull request #1406: DRILL-6641: Fix
columnValueCounts in ParquetGroupScanStatistics when ParquetGroupScan has
RowGroupInfo without column statistics
URL: https://github.com/apache/drill/pull/1406#discussion_r205825339
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScanStatistics.java
##########
@@ -88,19 +88,14 @@ public void collect(List<RowGroupInfo> rowGroupInfos,
ParquetTableMetadataBase p
for (ColumnMetadata column : rowGroup.getColumns()) {
SchemaPath schemaPath = SchemaPath.getCompoundPath(column.getName());
Long previousCount = columnValueCounts.get(schemaPath);
- if (previousCount != null) {
- if (previousCount != GroupScan.NO_COLUMN_STATS &&
column.isNumNullsSet()) {
- Long newCount = rowCount - column.getNulls();
- columnValueCounts.put(schemaPath,
columnValueCounts.get(schemaPath) + newCount);
- }
+ previousCount = previousCount == null ? 0 : previousCount;
Review comment:
Unnecessary boxing/unboxing and hash lookups. Consider
```
long newCount = GroupScan.NO_COLUMN_STATS;
if (column.isNumNullsSet()) {
newCount = rowCount - column.getNulls();
Long previousCount = columnValueCounts.get(schemaPath);
if (previousCount != null) {
if (GroupScan.NO_COLUMN_STATS != previousCount) {
newCount += previousCount;
} else {
continue;
}
}
}
columnValueCounts.put(schemaPath, newCount);
```
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