Github user icexelloss commented on the issue:
https://github.com/apache/spark/pull/20204
I usually run tests like this:
```
SPARK_TESTING=1 bin/pyspark pyspark.sql.tests ...
```
Does it make sense to expose similar usage for enabling coverage? Sth like
```
SPARK_TESTING_WITH_COVERAGE=1 bin/pyspark pyspark.sql.tests ...
```
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