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[SPARK-23047][PYTHON][SQL] Change MapVector to NullableMapVector in A…
…rrowColumnVector ## What changes were proposed in this pull request? This PR changes usage of `MapVector` in Spark codebase to use `NullableMapVector`. `MapVector` is an internal Arrow class that is not supposed to be used directly. We should use `NullableMapVector` instead. ## How was this patch tested? Existing test. Author: Li Jin <email@example.com> Closes #20239 from icexelloss/arrow-map-vector. (cherry picked from commit 4e6f8fb) Signed-off-by: hyukjinkwon <firstname.lastname@example.org>
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