HyukjinKwon opened a new pull request #31408:
URL: https://github.com/apache/spark/pull/31408
### What changes were proposed in this pull request?
This PR completes SPARK-10621 and makes functions APIs to use snake_case
across the languages.
In more details, this PR:
- Adds `count_distinct` in Scala Python, and R, and document that
`count_distinct` is encouraged. This was not deprecated because `countDistinct`
is pretty commonly used. We could deprecate in the future releases.
- Deprecates and renames:
- `sumDistinct` -> `sum_distinct`
- `bitwiseNOT` -> `bitwise_not`
- `shiftLeft -> `shiftleft` (matched with SQL name in `FunctionRegistry`)
- `shiftRight -> `shiftright` (matched with SQL name in `FunctionRegistry`)
- `shiftRightUnsigned` -> `shiftrightunsigned` (matched with SQL name in
`FunctionRegistry`)
- (Scala-specific) `typedLit` -> `typedlit`
- (Scala-specific) `callUDF` -> `call_udf`
### Why are the changes needed?
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
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