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ASF GitHub Bot commented on DRILL-5797: --------------------------------------- okalinin commented on a change in pull request #1370: DRILL-5797: Use Parquet new reader in all non-complex column queries URL: https://github.com/apache/drill/pull/1370#discussion_r201663521 ########## File path: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetReaderUtility.java ########## @@ -140,15 +140,87 @@ public static int getIntFromLEBytes(byte[] input, int start) { return out; } + /** + * Map full schema paths in format `a`.`b`.`c` to respective SchemaElement objects. + * + * @param footer Parquet file metadata + * @return schema full path to SchemaElement map + */ public static Map<String, SchemaElement> getColNameToSchemaElementMapping(ParquetMetadata footer) { - HashMap<String, SchemaElement> schemaElements = new HashMap<>(); + Map<String, SchemaElement> schemaElements = new HashMap<>(); FileMetaData fileMetaData = new ParquetMetadataConverter().toParquetMetadata(ParquetFileWriter.CURRENT_VERSION, footer); - for (SchemaElement se : fileMetaData.getSchema()) { - schemaElements.put(se.getName(), se); + + Iterator iter = fileMetaData.getSchema().iterator(); + + // skip first default 'root' element + if (iter.hasNext()) { Review comment: Done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)