Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19792
I think you can add a new test case somewhere around here -
https://github.com/apache/spark/blob/master/python/pyspark/sql/tests.py#L1724
maybe dealing with some combinations of `StructType`, `MapType`, `ArrayType`
and one of non-nested type (e.g., `IntegerType`), checking if the error message
is really improved.
For running tests, you could refer
https://spark.apache.org/docs/latest/building-spark.html#pyspark-tests-with-maven.
I personally test them locally first and then add and run some tests. Maybe
running `./python/run-tests --modules=pyspark-sql` could be enough. Also, make
sure running `./dev/lint-python` to check if it complies PEP8 and etc.
When you finish them, commit and push which will trigger the build via
Jenkins here. See also "Pull Request" in
http://spark.apache.org/contributing.html
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