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https://issues.apache.org/jira/browse/DRILL-6641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559957#comment-16559957
]
ASF GitHub Bot commented on DRILL-6641:
---------------------------------------
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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> TestConvertCountToDirectScan.ensureCorrectCountWithMissingStatistics() test
> fails randomly
> ------------------------------------------------------------------------------------------
>
> Key: DRILL-6641
> URL: https://issues.apache.org/jira/browse/DRILL-6641
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Volodymyr Vysotskyi
> Assignee: Volodymyr Vysotskyi
> Priority: Major
> Labels: ready-to-commit
> Fix For: 1.15.0
>
>
> {{TestConvertCountToDirectScan.ensureCorrectCountWithMissingStatistics()}}
> fails randomly with assertion error:
> {noformat}
> Found unwanted pattern in plan: DynamicPojoRecordReader
> 00-00 Screen
> 00-01 Project(cnt_str=[$0], cnt_total=[$1])
> 00-02 Scan(groupscan=[files =
> [/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/target/org.apache.drill.exec.planner.logical.TestConvertCountToDirectScan/dfsTestTmp/1532655133770-0/wide_str_table/0_0_2.parquet,
>
> /home/vitalii/IdeaProjects/drill-fork/exec/java-exec/target/org.apache.drill.exec.planner.logical.TestConvertCountToDirectScan/dfsTestTmp/1532655133770-0/wide_str_table/0_0_1.parquet],
> numFiles = 2, DynamicPojoRecordReader{records = [[0, 2]]}])
> {noformat}
> This test uses a table with two partitions and it may fail when a partition
> with set statistics is taken first in the
> {{ParquetGroupScanStatistics.collect()}} method, which is indirectly called
> from {{ConvertCountToDirectScan}} rule.
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