Nicholas Chammas created SPARK-21712:
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Summary: Clarify PySpark Column.substr() type checking error
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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
Priority: Trivial
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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