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https://issues.apache.org/jira/browse/HIVE-1731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925098#action_12925098
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Adam Kramer commented on HIVE-1731:
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>From a UNION ALL query:
FAILED: Error in semantic analysis: Schema of both sides of union should match:
destinationid:_col1 _col2
...this should 1) provide a line number where the error is, 2) say how the
schemata mismatch, and 3) use actual column names. destinationid is an actual
column name, but I have no idea what _col1 and _col2 refer to.
When I have 10 UNION ALLs on top of each other, this error message is very
aggravating.
> Improve miscellaneous error messages
> ------------------------------------
>
> Key: HIVE-1731
> URL: https://issues.apache.org/jira/browse/HIVE-1731
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: John Sichi
> Fix For: 0.7.0
>
>
> This is a place for accumulating error message improvements so that we can
> update a bunch in batch.
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