AnuragRaut08 commented on code in PR #51093:
URL: https://github.com/apache/arrow/pull/51093#discussion_r3905878294
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cpp/src/arrow/compute/kernels/scalar_cast_test.cc:
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@@ -3842,6 +3842,49 @@ TEST(Cast, CastMap) {
Cast(src, dst_type));
}
+// GH-51029: An all-valid validity bitmap with an unknown null count must
+// not be treated as containing nulls when validating MapArray keys.
+TEST(Cast, CastMapWithAllValidKeysBitmap) {
Review Comment:
Done. I simplified the regression test by setting the null count to
kUnknownNullCount directly and moved it to array_list_test.cc.
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