vvysotskyi 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_r205838330
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File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScanStatistics.java
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@@ -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:
@vrozov, thanks for taking a look at this change. I think we should leave
this code as it is for the next reasons:
- boxing of `0` is happened only once;
- unboxing happens in both cases: when `+=` is produced for your case or
when `+` is done.
- `continue` in the `else` block will cause problems for detecting that
column is partitioned (see usage of `first` local variable);
- existing code looks clearer, since the logic is just splitted only into
two branches.
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