Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/13734
It seems you're concerning multiple issue. I'll focus on the same versions
issue first.
The principle of this PR is simply adding `since` tag for all exposed
functions.
IMHO, that is better since we should consider how to maintain the versions
in the future.
For example, the case of `count`, `agg`, `summarize`, let us assume that we
add another function `agg2` in ther future.
- Case 1: If we didn't keep version 1.4.0 for all functions, new
contributor should update old functions together.
- Case 2: If we keep version 1.4.0 for all functions, new contributor can
add `agg2` without considering old functions.
I think `Case 1` is not good for maintainability.
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