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https://issues.apache.org/jira/browse/SPARK-21712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon reassigned SPARK-21712:
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Assignee: Nicholas Chammas
> Clarify PySpark Column.substr() type checking error message
> -----------------------------------------------------------
>
> Key: SPARK-21712
> URL: https://issues.apache.org/jira/browse/SPARK-21712
> Project: Spark
> Issue Type: Documentation
> Components: PySpark, SQL
> Affects Versions: 2.2.0
> Reporter: Nicholas Chammas
> Assignee: Nicholas Chammas
> Priority: Trivial
> Fix For: 2.3.0
>
>
> https://github.com/apache/spark/blob/f0169a1c6a1ac06045d57f8aaa2c841bb39e23ac/python/pyspark/sql/column.py#L408-L409
> "Can not mix the type" is really unclear.
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