felipecrv commented on code in PR #34408:
URL: https://github.com/apache/arrow/pull/34408#discussion_r1136406197
##########
cpp/src/arrow/array/data.h:
##########
@@ -33,6 +33,19 @@
namespace arrow {
class Array;
+struct ArrayData;
+
+namespace internal {
+// ----------------------------------------------------------------------
+// Null handling for types without a validity bitmap
+
+ARROW_EXPORT bool IsNullSparseUnion(const ArrayData& data, int64_t i);
+ARROW_EXPORT bool IsNullDenseUnion(const ArrayData& data, int64_t i);
+ARROW_EXPORT bool IsNullRunEndEncoded(const ArrayData& data, int64_t i);
+
+ARROW_EXPORT bool UnionMayHaveLogicalNulls(const ArrayData& data);
+ARROW_EXPORT bool RunEndEncodedMayHaveLogicalNulls(const ArrayData& data);
Review Comment:
I could introduce an `IsValidFallback` function that handles the case when
the validity buffer is `NULLPTR`, then all these could become `.cc` only.
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