Remove deprecated feature group-by-uses-equal

[rschlussel]

Description

Remove deprecated legacy behavior for group by to use equal to rather than distinct. Remove the corresponding config
deprecated.group-by-uses-equal

Motivation and Context

Clean up of deprecated/not maintained feature.

Impact

see above

Test Plan

CI

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Release Notes

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== RELEASE NOTES ==

General Changes
* Remove deprecated feature and configuration property ``deprecated.group-by-uses-equal``, which allowed group by to use equal to rather than distinct semantics.

[elharo]

[INFO] There is 1 error reported by Checkstyle 8.16 with src/checkstyle/presto-checks.xml ruleset.
Error: src/test/java/com/facebook/presto/hive/TestHivePageSink.java:[36,8] (imports) UnusedImports: Unused import - com.facebook.presto.sql.analyzer.FeaturesConfig.

[feilong-liu]

Can you give a brief context on what this feature is and why we are removing it?

[rschlussel]

Can you give a brief context on what this feature is and why we are removing it?

The original implementation of group by in Presto was incorrectly using equal to rather than is distinct from. When that was fixed, this config was added to use the legacy behavior baad26e. It's been deprecated a long time, and I think we can safely remove it now.