[SPARK-29779][SPARK-30479][CORE][SQL][FOLLOWUP] Reflect review comments on post-hoc review #27414
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What changes were proposed in this pull request?
This PR reflects review comments on post-hoc review among PRs for SPARK-29779 (#27085), SPARK-30479 (#27164). The list of review comments this PR addresses are below:
I also applied review comments to the CORE module (BasicEventFilterBuilder.scala) as well, as the review comments for SQL/core module (SQLEventFilterBuilder.scala) can be applied there as well.
Why are the changes needed?
There're post-hoc reviews on PRs for such issues, like links in above section.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Existing UTs.