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https://issues.apache.org/jira/browse/TAJO-1796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14734282#comment-14734282
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ASF GitHub Bot commented on TAJO-1796:
--------------------------------------
Github user eminency closed the pull request at:
https://github.com/apache/tajo/pull/729
> Count all query for Parquet is crashed
> --------------------------------------
>
> Key: TAJO-1796
> URL: https://issues.apache.org/jira/browse/TAJO-1796
> Project: Tajo
> Issue Type: Bug
> Components: Storage
> Affects Versions: 0.10.1
> Reporter: Jongyoung Park
> Assignee: Jongyoung Park
> Priority: Critical
> Fix For: 0.11.0
>
> Attachments: TAJO-1796.patch
>
>
> When 'select count( * )' is excuted, it fails with following error log:
> {quote}
> 2015-08-21 17:17:31,371 ERROR
> org.apache.tajo.engine.planner.physical.HashShuffleFileWriteExec: A group
> type can not be empty. Parquet does not support empty group without leaves.
> Empty group: table_schema
> org.apache.parquet.schema.InvalidSchemaException: A group type can not be
> empty. Parquet does not support empty group without leaves. Empty group:
> table_schema
> at org.apache.parquet.schema.GroupType.<init>(GroupType.java:92)
> at org.apache.parquet.schema.GroupType.<init>(GroupType.java:48)
> at org.apache.parquet.schema.MessageType.<init>(MessageType.java:50)
> at
> org.apache.tajo.storage.parquet.TajoSchemaConverter.convert(TajoSchemaConverter.java:152)
> at
> org.apache.tajo.storage.parquet.TajoReadSupport.init(TajoReadSupport.java:76)
> at
> org.apache.parquet.hadoop.InternalParquetRecordReader.initialize(InternalParquetRecordReader.java:172)
> at
> org.apache.parquet.hadoop.ParquetReader.initReader(ParquetReader.java:152)
> at org.apache.parquet.hadoop.ParquetReader.read(ParquetReader.java:128)
> at
> org.apache.tajo.storage.parquet.ParquetScanner.next(ParquetScanner.java:73)
> ...
> {quote}
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