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https://issues.apache.org/jira/browse/SPARK-16850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403449#comment-15403449
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Apache Spark commented on SPARK-16850:
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User 'petermaxlee' has created a pull request for this issue:
https://github.com/apache/spark/pull/14453
> Improve error message for greatest/least
> ----------------------------------------
>
> Key: SPARK-16850
> URL: https://issues.apache.org/jira/browse/SPARK-16850
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Peter Lee
>
> Greatest/least function does not have the most friendly error message for
> data types:
> Error in SQL statement: AnalysisException: cannot resolve 'greatest(CAST(1.0
> AS DECIMAL(2,1)), "1.0")' due to data type mismatch: The expressions should
> all have the same type, got GREATEST (ArrayBuffer(DecimalType(2,1),
> StringType)).; line 1 pos 7
> We should report the human readable data type instead, rather than having
> "ArrayBuffer" and "StringType".
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