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https://issues.apache.org/jira/browse/DRILL-5797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16538535#comment-16538535
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ASF GitHub Bot commented on DRILL-5797:
---------------------------------------
arina-ielchiieva commented on a change in pull request #1370: DRILL-5797: Use
Parquet new reader more often
URL: https://github.com/apache/drill/pull/1370#discussion_r201324236
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/AbstractParquetScanBatchCreator.java
##########
@@ -191,4 +201,42 @@ protected AbstractDrillFileSystemManager(OperatorContext
operatorContext) {
protected abstract DrillFileSystem get(Configuration config, String path)
throws ExecutionSetupException;
}
+ /**
+ * Check whether any of queried columns is nested or repetitive.
+ *
+ * @param footer Parquet file schema
+ * @param columns list of query SchemaPath objects
+ */
+ public static boolean containsComplexColumn(ParquetMetadata footer,
List<SchemaPath> columns) {
+
+ Map<String, ColumnDescriptor> colDescMap =
ParquetReaderUtility.getColNameToColumnDescriptorMapping(footer);
+ Map<String, SchemaElement> schemaElements =
ParquetReaderUtility.getColNameToSchemaElementMapping(footer);
+
+ for (SchemaPath schemaPath : columns) {
+ // non-nested column check: full path must be equal to root segment path
+ if (!schemaPath.getUnIndexed().toString().replaceAll("`", "")
Review comment:
That's definitely not a good choice of comparing by replacing "`". Please
find a different way to compare or write helper method that would compare
without replacing, maybe traversing schema path. Schema path has plenty of
handy methods, if needed is missing implement one. Basically you cannot rely on
to string representation it can change, you should rely on object info instead.
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> Use more often the new parquet reader
> -------------------------------------
>
> Key: DRILL-5797
> URL: https://issues.apache.org/jira/browse/DRILL-5797
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Parquet
> Reporter: Damien Profeta
> Assignee: Oleksandr Kalinin
> Priority: Major
> Fix For: 1.15.0
>
>
> The choice of using the regular parquet reader of the optimized one is based
> of what type of columns is in the file. But the columns that are read by the
> query doesn't matter. We can increase a little bit the cases where the
> optimized reader is used by checking is the projected column are simple or
> not.
> This is an optimization waiting for the fast parquet reader to handle complex
> structure.
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