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[C++] RunEndEncodedBuilder does not merge consecutive NaN values

Component: C++

Type: bug

Status: Open.

#50517 In apache/arrow;

· andishgar opened on Jul 15, 2026

[C++] Array::IsValid Returns Incorrect Result for Struct Entries

Component: C++

Type: bug

Status: Open.

#50516 In apache/arrow;

· andishgar opened on Jul 15, 2026

[C++][Python] Casting nested structs fails when inner struct are non-nullable, but the field for the inner struct is nullable

Component: C++

Component: Python

Type: bug

Status: Open.

#50515 In apache/arrow;

· davlee1972 opened on Jul 15, 2026

[R] read_ipc_stream fails to unify nested Enum fields inside a Struct array across record batches

Component: R

Type: bug

Status: Open.

#50514 In apache/arrow;

· umweltinfo opened on Jul 15, 2026

[C++][Compute] unique, value_counts and dictionary_encode have no kernel for float16 (halffloat)

Component: C++

Type: enhancement

Status: Open.

#50512 In apache/arrow;

· fornwall opened on Jul 15, 2026

[C++] Choose the Correct Value in ArrayBuilder::AppendEmptyValue() for Floating-Point Types

Component: C++

Type: enhancement

Status: Open.

#50509 In apache/arrow;

· andishgar opened on Jul 15, 2026

[C++] Accept Scalar Types Consistently in RunEndEncodedBuilder::AppendScalar and RunEndEncodedBuilder::AppendScalars

Component: C++

Type: enhancement

Status: Open.

#50508 In apache/arrow;

· andishgar opened on Jul 14, 2026

[C++] Clarify that RunEndEncodedBuilder::AppendScalar Only Accepts std::shared_ptr<Scalar>

Component: C++

Type: enhancement

Status: Open.

#50507 In apache/arrow;

· andishgar opened on Jul 14, 2026

[C++][Gandiva] Out-of-bounds read in upper/lower/initcap on truncated trailing UTF-8

Component: C++

Component: Gandiva

Status: Open.

#50504 In apache/arrow;

· Arawoof06 opened on Jul 14, 2026

[Python][C++] 25.0.0 aarch64 wheel: deterministic dictionary-decode failure on Neoverse V1 / AWS Graviton3 (SIGSEGV via iter_batches; ArrowInvalid single-threaded); N1/V2 unaffected; 24.0.0 OK

Component: C++

Component: Python

Status: Open.

#50503 In apache/arrow;

· eaglenebulaplayer opened on Jul 14, 2026

[R] Polish NEWS.md for 25.0.0

Component: R

Type: enhancement

Status: Open.

#50496 In apache/arrow;

· thisisnic opened on Jul 13, 2026

[R] 25.0.0 Release followups

Status: Open.

#50495 In apache/arrow;

· thisisnic opened on Jul 13, 2026