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ASF GitHub Bot commented on DRILL-7096: --------------------------------------- vvysotskyi commented on pull request #1829: DRILL-7096: Develop vector for canonical Map<K,V> URL: https://github.com/apache/drill/pull/1829#discussion_r317156892 ########## File path: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetReaderUtility.java ########## @@ -713,4 +715,63 @@ public static boolean containsComplexColumn(ParquetMetadata footer, List<SchemaP } return false; } + + /** + * Converts list of {@link OriginalType}s to list of {@link org.apache.drill.common.types.TypeProtos.MajorType}s. + * <b>NOTE</b>: current implementation cares about {@link OriginalType#MAP} only + * converting it to {@link org.apache.drill.common.types.TypeProtos.MinorType#DICT}. + * Other original types are converted to {@code null}. + * + * @param originalTypes list of Parquet's types + * @return list containing either {@code null} or type with minor + * type {@link org.apache.drill.common.types.TypeProtos.MinorType#DICT} values + */ + public static List<TypeProtos.MajorType> getComplexTypes(List<OriginalType> originalTypes) { Review comment: Is it possible to use `BitSet` here? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to 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 > Develop vector for canonical Map<K,V> > ------------------------------------- > > Key: DRILL-7096 > URL: https://issues.apache.org/jira/browse/DRILL-7096 > Project: Apache Drill > Issue Type: Sub-task > Reporter: Igor Guzenko > Assignee: Bohdan Kazydub > Priority: Major > Fix For: 1.17.0 > > > Canonical Map<K,V> datatype can be represented using combination of three > value vectors: > keysVector - vector for storing keys of each map > valuesVector - vector for storing values of each map > offsetsVector - vector for storing of start indexes of next each map > So it's not very hard to create such Map vector, but there is a major issue > with such map representation. It's hard to search maps values by key in such > vector, need to investigate some advanced techniques to make such search > efficient. Or find other more suitable options to represent map datatype in > world of vectors. > After question about maps, Apache Arrow developers responded that for Java > they don't have real Map vector, for now they just have logical Map type > definition where they define Map like: List< Struct<key:key_type, > value:value_type> >. So implementation of value vector would be useful for > Arrow too. -- This message was sent by Atlassian Jira (v8.3.2#803003)