Burak Yavuz created SPARK-8803:
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Summary: Crosstab element's can't contain null's and back ticks
Key: SPARK-8803
URL: https://issues.apache.org/jira/browse/SPARK-8803
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Burak Yavuz
Having back ticks or null as elements causes problems.
Since elements become column names, we have to drop them from the element as
back ticks are special characters.
Having null throws exceptions, we could replace them with empty strings.
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