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https://issues.apache.org/jira/browse/HIVE-22670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17071919#comment-17071919
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Ferdinand Xu commented on HIVE-22670:
-------------------------------------
Agree with [~pvary]. We should keep the inner loop as simple as possible. A lot
of branch inside the loop will lead to some potential performance drops. Did
you get a chance in its performance impacts? [~ganeshas]
> ArrayIndexOutOfBoundsException when vectorized reader is used for reading a
> parquet file
> ----------------------------------------------------------------------------------------
>
> Key: HIVE-22670
> URL: https://issues.apache.org/jira/browse/HIVE-22670
> Project: Hive
> Issue Type: Bug
> Components: Parquet, Vectorization
> Affects Versions: 3.1.2, 2.3.6
> Reporter: Ganesha Shreedhara
> Assignee: Ganesha Shreedhara
> Priority: Major
> Attachments: HIVE-22670.1.patch, HIVE-22670.2.patch
>
>
> ArrayIndexOutOfBoundsException is getting thrown while decoding dictionaryIds
> of a row group in parquet file with vectorization enabled.
> *Exception stack trace:*
> {code:java}
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
> at
> org.apache.parquet.column.values.dictionary.PlainValuesDictionary$PlainBinaryDictionary.decodeToBinary(PlainValuesDictionary.java:122)
> at
> org.apache.hadoop.hive.ql.io.parquet.vector.ParquetDataColumnReaderFactory$DefaultParquetDataColumnReader.readString(ParquetDataColumnReaderFactory.java:95)
> at
> org.apache.hadoop.hive.ql.io.parquet.vector.VectorizedPrimitiveColumnReader.decodeDictionaryIds(VectorizedPrimitiveColumnReader.java:467)
> at
> org.apache.hadoop.hive.ql.io.parquet.vector.VectorizedPrimitiveColumnReader.readBatch(VectorizedPrimitiveColumnReader.java:68)
> at
> org.apache.hadoop.hive.ql.io.parquet.vector.VectorizedParquetRecordReader.nextBatch(VectorizedParquetRecordReader.java:410)
> at
> org.apache.hadoop.hive.ql.io.parquet.vector.VectorizedParquetRecordReader.next(VectorizedParquetRecordReader.java:353)
> at
> org.apache.hadoop.hive.ql.io.parquet.vector.VectorizedParquetRecordReader.next(VectorizedParquetRecordReader.java:92)
> at
> org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.doNext(HiveContextAwareRecordReader.java:365)
> ... 24 more{code}
>
> This issue seems to be caused by re-using the same dictionary column vector
> while reading consecutive row groups. This looks like one of the corner case
> bug which occurs for a certain distribution of dictionary/plain encoded data
> while we read/populate the underlying bit packed dictionary data into a
> column-vector based data structure.
> Similar issue issue was reported in spark (Ref:
> https://issues.apache.org/jira/browse/SPARK-16334)
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