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arrow-ipc: Add tests for nested dicts for Map and Union arrays

arrowChanges to the arrow crateChanges to the arrow crate

Status: Open (in progress).

apache/arrow-rsnumber 9146

#9146 In apache/arrow-rs;

· brancz opened on Jan 12, 2026

Refactor Date32 manipulation functions for overflow handling

arrowChanges to the arrow crateChanges to the arrow crate

parquet-variantparquet-variant* cratesparquet-variant* crates

Status: Open (in progress).

apache/arrow-rsnumber 9144

#9144 In apache/arrow-rs;

· cht42 opened on Jan 12, 2026

feat: add <code>reserve</code> to <code>Rows</code>

arrowChanges to the arrow crateChanges to the arrow crate

Status: Open (in progress).

apache/arrow-rsnumber 9142

#9142 In apache/arrow-rs;

· rluvaton opened on Jan 11, 2026

feat: add with_nulls to PrimitiveArray, BooleanArray, and GenericByte…

arrowChanges to the arrow crateChanges to the arrow crate

Status: Open (in progress).

apache/arrow-rsnumber 9141

#9141 In apache/arrow-rs;

· keirsalterego opened on Jan 11, 2026

Add a crate for HeapSize trait

arrowChanges to the arrow crateChanges to the arrow crate

parquetChanges to the parquet crateChanges to the parquet crate

Status: Open (in progress).

apache/arrow-rsnumber 9138

#9138 In apache/arrow-rs;

· adriangb opened on Jan 10, 2026

[Parquet] perf: Create StructArrays directly rather than via <code>ArrayData</code> (1% improvement)

arrowChanges to the arrow crateChanges to the arrow crate

parquetChanges to the parquet crateChanges to the parquet crate

performance

Status: Open (in progress).

apache/arrow-rsnumber 9120

#9120 In apache/arrow-rs;

· alamb opened on Jan 9, 2026

feat: add projection support to TapeDecoder for skipping unknown fields in json parsing (1.4x speedup)

arrowChanges to the arrow crateChanges to the arrow crate

performance

Status: Open (in progress).

apache/arrow-rsnumber 9097

#9097 In apache/arrow-rs;

· Weijun-H opened on Jan 5, 2026

perf: improve field indexing in JSON StructArrayDecoder (1.7x speed up)

arrowChanges to the arrow crateChanges to the arrow crate

performance

Status: Open (in progress).

apache/arrow-rsnumber 9086

#9086 In apache/arrow-rs;

· Weijun-H opened on Jan 2, 2026

perf: improve calculating length performance for view byte array in row conversion

arrowChanges to the arrow crateChanges to the arrow crate

performance

Status: Open (in progress).

apache/arrow-rsnumber 9080

#9080 In apache/arrow-rs;

· rluvaton opened on Dec 31, 2025

perf: improve calculating length performance for nested arrays in row conversion

arrowChanges to the arrow crateChanges to the arrow crate

performance

Status: Open (in progress).

apache/arrow-rsnumber 9079

#9079 In apache/arrow-rs;

· rluvaton opened on Dec 31, 2025

perf: improve calculating length performance for <code>GenericByteArray</code> in row conversion

arrowChanges to the arrow crateChanges to the arrow crate

performance

Status: Open (in progress).

apache/arrow-rsnumber 9078

#9078 In apache/arrow-rs;

· rluvaton opened on Dec 31, 2025

Avoid clones while creating Arrays from <code>ArrayData</code> (speed up reading from Parquet reader)

arrowChanges to the arrow crateChanges to the arrow crate

Status: Draft (not ready).

apache/arrow-rsnumber 9058

#9058 In apache/arrow-rs;

· alamb opened on Dec 28, 2025