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ASF GitHub Bot commented on DRILL-4287: --------------------------------------- Github user jinfengni commented on a diff in the pull request: https://github.com/apache/drill/pull/345#discussion_r51518560 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScan.java --- @@ -338,8 +354,14 @@ private boolean hasSingleValue(ColumnMetadata columnChunkMetaData) { return (columnChunkMetaData != null) && (columnChunkMetaData.hasSingleValue()); } + @Override --- End diff -- JsonIgnore is needed here? > Do lazy reading of parquet metadata cache file > ---------------------------------------------- > > Key: DRILL-4287 > URL: https://issues.apache.org/jira/browse/DRILL-4287 > Project: Apache Drill > Issue Type: Bug > Components: Query Planning & Optimization > Affects Versions: 1.4.0 > Reporter: Aman Sinha > Assignee: Jinfeng Ni > > Currently, the parquet metadata cache file is read eagerly during creation of > the DrillTable (as part of ParquetFormatMatcher.isReadable()). This is not > desirable from performance standpoint since there are scenarios where we want > to do some up-front optimizations - e.g. directory-based partition pruning > (see DRILL-2517) or potential limit 0 optimization etc. - and in such > situations it is better to do lazy reading of the metadata cache file. > This is a placeholder to perform such delayed reading since it is needed for > the aforementioned optimizations. -- This message was sent by Atlassian JIRA (v6.3.4#6332)