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https://issues.apache.org/jira/browse/TAJO-1907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944540#comment-14944540
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ASF GitHub Bot commented on TAJO-1907:
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Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/800#issuecomment-145747662
MySQL InnoDB allows the size of a single column for an index key up to 767
bytes by default.
Please refer to this document.
https://dev.mysql.com/doc/refman/5.5/en/innodb-restrictions.html
> Reduce the size of the INDEXES table's COLUMN_NAMES field
> ---------------------------------------------------------
>
> Key: TAJO-1907
> URL: https://issues.apache.org/jira/browse/TAJO-1907
> Project: Tajo
> Issue Type: Task
> Components: Catalog
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Priority: Critical
> Fix For: 0.11.0
>
>
> MySQL InnoDB allows the size of a single column for an index key up to 767
> bytes by default. For a TEXT or VARCHAR column, a UTF-8 character set and the
> maximum of 3 bytes for each character are assumed. So, the current length of
> COLUMN_NAMES (256) causes an error while starting up occasionally.
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