[PR] Fix distinguishing the joined geospatial types for ST_KNN [sedona-db]

["Kontinuation (via GitHub)" <gi...@apache.org>]

Kontinuation opened a new pull request, #87:
URL: https://github.com/apache/sedona-db/pull/87

   This PR fixes a regression introduced by https://github.com/apache/sedona-db/pull/57, which added geography type checking to prevent optimized spatial joins from being used with unsupported geography types.
   
   The problematic patch incorrectly matches `left` and `right` expressions in `KNNPredicate` to query plans. Actually, how `left` and `right` maps to the original query plans depends on the value of `probe_side` field. This is quite misleading and may be addressed in a future PR by renaming `left` and `right` to `build` and `probe`.
   


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