santosh-d3vpl3x opened a new pull request, #37761:
URL: https://github.com/apache/spark/pull/37761
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### What changes were proposed in this pull request?
This change adds an ability for code to rename multiple columns in a single
call.
```scala
withColumnsRenamed(colsMap: Map[String, String]): DataFrame
```
### Why are the changes needed?
We have seen that catalyst optimiser struggles with bigger plans. The larger
contribution to these plans in our setup comes from `withColumnRenamed`, `drop`
and `withColumn` being called in for loop by unknowing users. `master` branch
of spark already has a version for handling `withColumns` and `drop` for
multiple columns. The missing bit of the puzzle is `withColumnRenamed`.
### Does this PR introduce _any_ user-facing change?
Yes, adds a method to efficiently rename columns in a single batch.
### How was this patch tested?
Added unit tests
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