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https://issues.apache.org/jira/browse/DRILL-7171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16817428#comment-16817428
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ASF GitHub Bot commented on DRILL-7171:
---------------------------------------
amansinha100 commented on pull request #1748: DRILL-7171: Create metadata
directories cache file in the leaf level directories to support
ConvertCountToDirectScan optimization.
URL: https://github.com/apache/drill/pull/1748#discussion_r275170738
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/metadata/Metadata.java
##########
@@ -353,22 +353,15 @@ private static boolean
ignoreReadingMetadata(MetadataContext metaContext, Path p
writeFile(metadataTableWithRelativePaths.getSummary(), new Path(path,
METADATA_SUMMARY_FILENAME), fs);
Metadata_V4.MetadataSummary metadataSummaryWithRelativePaths =
metadataTableWithRelativePaths.getSummary();
- if (directoryList.size() > 0 && childFiles.size() == 0) {
- ParquetTableMetadataDirs parquetTableMetadataDirsRelativePaths =
- new
ParquetTableMetadataDirs(metadataSummaryWithRelativePaths.directories);
- writeFile(parquetTableMetadataDirsRelativePaths, new Path(path,
METADATA_DIRECTORIES_FILENAME), fs);
- if (timer != null) {
- logger.debug("Creating metadata files recursively took {} ms",
timer.elapsed(TimeUnit.MILLISECONDS));
- }
- ParquetTableMetadataDirs parquetTableMetadataDirs = new
ParquetTableMetadataDirs(directoryList);
- return Pair.of(parquetTableMetadata, parquetTableMetadataDirs);
- }
- List<Path> emptyDirList = new ArrayList<>();
+ ParquetTableMetadataDirs parquetTableMetadataDirsRelativePaths =
Review comment:
Pls add a comment indicating that and empty directories list will be created
for leaf level directories. For sub-directories with mix of files and
directories, the directories will be tracked.
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> Count(*) query on leaf level directory is not reading summary cache file.
> -------------------------------------------------------------------------
>
> Key: DRILL-7171
> URL: https://issues.apache.org/jira/browse/DRILL-7171
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Venkata Jyothsna Donapati
> Assignee: Venkata Jyothsna Donapati
> Priority: Minor
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Since the leaf level directory doesn't store the metadata directories file,
> while reading summary if the directories cache file is not present, it is
> assumed that the cache is possibly corrupt and reading of the summary cache
> file is skipped. Metadata directories cache file should be created at the
> leaf level.
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