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https://issues.apache.org/jira/browse/SPARK-19084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16516482#comment-16516482
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Marcelo Vanzin commented on SPARK-19084:
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(Please ignore my PR above - it should have tagged SPARK-19804, but I
apparently cannot type.)
> conditional function: field
> ---------------------------
>
> Key: SPARK-19084
> URL: https://issues.apache.org/jira/browse/SPARK-19084
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Chenzhao Guo
> Priority: Major
>
> field(str, str1, str2, ... ) is a variable-length(>=2) function which returns
> the index of str in the list (str1, str2, ... ) or 0 if not found.
> Every parameter is required to be subtype of AtomicType.
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