Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/20091
@mridulm Actually you have a good point on that we should be extremely
careful in making change s related to an exposed interface, now I'll narrow
down the scope of this PR to:
```
If the safety check fails and `spark.default.parallelism` is set, and the
value of defaultParallelism is smaller than the number of existing partitioner,
then we should still use the existing partitioner.
```
Does this make more sense?
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