apache/arrow-java

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Official Java implementation of Apache Arrow

Stars: 95
Forks: 154
Open beginner issues: 8
Indexed issues: 432
Avg merge: 2d 16h
Merged PRs (30d): 9

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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431 open issues indexed

[CI] Drop x86_64 macOS from JNI builds Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow-java#1305 · Opened Sep 21, 2026
Add support for the arrow.json extension type Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 68/100

apache/arrow-java#1302 · Opened Sep 20, 2026
[C Data] Format.asString emits locale dependent digits in format strings Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/arrow-java#1300 · Opened Sep 19, 2026
[CI] Build Java and C Data artifacts once Open

Type: enhancement

apache/arrow-java#1283 · 1 comment · 1 assignee · Opened Sep 2, 2026
[JDBC] Honor DriverManager login timeout Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

apache/arrow-java#1268 · Opened Aug 28, 2026
[JDBC] Implement DataSource login timeout Open

Difficulty 4/5 3-5 days Newbie friendliness 66/100

apache/arrow-java#1267 · Opened Aug 28, 2026
DictionaryEncoder.decode accepts out-of-range dictionary indices Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

apache/arrow-java#1261 · Opened Aug 18, 2026
JNI local-reference accumulation in the string array helpers Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 75/100

apache/arrow-java#1256 · 1 comment · Opened Aug 7, 2026
[Java] Parquet DatasetFileWriter not completely emptying allocator after finishing a write Open

Type: usage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow-java#1255 · Opened Aug 3, 2026
Truly unchecked getters Open

Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

apache/arrow-java#1252 · Opened Jul 28, 2026
DecimalVector.setBigEndian writes oversized value before validating length Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow-java#1246 · Opened Jul 23, 2026
[java][Vector][Performance] PromotableWriter.setPosition resolving to itable dispatch on C2 compiled path. Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/arrow-java#1238 · Opened Jul 20, 2026
ArrowFlightJdbcArray.getArray(index, count) can read past the end of the array slice Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/arrow-java#1236 · Opened Jul 20, 2026
[Java] VectorUnloader has multiple memory leak issues Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 62/100

apache/arrow-java#1234 · 3 comments · Opened Jul 18, 2026
[Java][FlightSQL][JDBC] Driver drops TLS for endpoint locations advertised by the server Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow-java#1232 · Opened Jul 17, 2026
[Java][JDBC] ClobConsumer writes past VarCharVector data buffer for large CLOBs Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/arrow-java#1230 · Opened Jul 15, 2026
Support Format Spec 1.5 - Decimal32/64 Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 52/100

apache/arrow-java#1228 · Opened Jul 14, 2026
Out-of-bounds read for corrupt view offsets in BaseVariableWidthViewVector Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow-java#1217 · Opened Jul 6, 2026
Byte-array elements leak in `FromSchemaByteArray()` Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

apache/arrow-java#1205 · Opened Jul 4, 2026
[Java][FlightSQL] JDBC Driver fails when Looker formats the URL with ':direct=' instead of '://' Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

apache/arrow-java#1203 · 7 comments · Opened Jul 2, 2026
[Java][IPC] AbstractCompressionCodec.compress() writes prefix=0 for empty buffers, incompatible with C++/Python readers Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

apache/arrow-java#1196 · 1 comment · Opened Jun 29, 2026
Empty ListVector and LargeListVector can expose offset buffers with writerIndex greater than capacity Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow-java#1194 · 2 comments · Opened Jun 23, 2026
[Java] DictionaryEncoder doesn't crash when decoding index outside of Dictionary Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

apache/arrow-java#1158 · Opened May 19, 2026
[Java] Improve VectorSchemaRoot.getVector(String name) lookup performance Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 72/100

apache/arrow-java#1148 · Opened May 13, 2026
Managing ownership in VectorSchemaRoot#addVector, recent changes miss the main fault. Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/arrow-java#1142 · 4 comments · Opened May 10, 2026
Consume COLUMN_DEF in JDBC Flight Driver Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 52/100

apache/arrow-java#1134 · Opened May 4, 2026
[FlightSQL] Statement.execute(String) can leak server prepared-statement handles when reused Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

apache/arrow-java#1129 · Opened Apr 27, 2026
`UnionListReader.setPosition` throws IOOBE on a post-IPC empty List Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 67/100

apache/arrow-java#1125 · Opened Apr 21, 2026
[IPC][ZSTD] Compressed buffer prefix can be written as 0 while ZSTD frame has non-zero content size Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

apache/arrow-java#1116 · 1 comment · Opened Apr 15, 2026
[Vector][ExtensionType] ComplexCopier requires that extension types' holder readers implement getField Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/arrow-java#1109 · Opened Apr 10, 2026
Java 21 breaks access to netty-buffer class Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

apache/arrow-java#1106 · 1 comment · Opened Apr 6, 2026
[Flight SQL] Derby dependency (test scope) flagged as vulnerable to CVE-2022-46337 with no available Maven patch Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

apache/arrow-java#1102 · 1 comment · Opened Apr 2, 2026
Expose Arrow `Struct` columns as JDBC `STRUCT` metadata in the Flight SQL JDBC driver. Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

apache/arrow-java#1100 · Opened Mar 31, 2026
[Java][FlightRPC] Flight SQL JDBC driver does not expose per-batch app_metadata from FlightStream Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 75/100

apache/arrow-java#1089 · Opened Mar 24, 2026
[Flight client] Allow disabling the creation of a child allocator Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 55/100

apache/arrow-java#1051 · 1 reaction · Opened Mar 6, 2026
Support message level custom_metadata on DictionaryBatch (IPC Message field) Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

apache/arrow-java#1043 · 1 comment · Opened Feb 27, 2026
Implement snappy compression Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/arrow-java#1041 · Opened Feb 26, 2026
Use default chunk size as 4 MB than than 16Mb in arrow's rolling policy Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

apache/arrow-java#1040 · Opened Feb 26, 2026
Java compression codecs do not release compressed ArrowBuf in decompress, causing allocator leaks Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

apache/arrow-java#1037 · Opened Feb 25, 2026
Support per-batch custom_metadata on RecordBatch (IPC Message field) Open

Type: enhancement

apache/arrow-java#1035 · 1 comment · 1 assignee · Opened Feb 24, 2026
NoSuchMethodError with gRPC Java 1.79.0 Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/arrow-java#1024 · 1 comment · Opened Feb 17, 2026
Update vcpkg revision for Linux JNI build Open

Type: enhancement

apache/arrow-java#1020 · 1 assignee · Opened Feb 16, 2026
Add documentation of Flight SQL Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/arrow-java#979 · 1 comment · Opened Jan 24, 2026
java.lang.NoSuchMethodError: java.nio.ByteBuffer.position(I)Ljava/nio/ByteBuffer Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow-java#966 · 2 comments · Opened Jan 16, 2026
Root Allocator doesn't release memory when its closed Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/arrow-java#950 · 6 comments · Opened Jan 8, 2026
[FlightRPC] Remove sketchy gRPC reflection code Open

help wanted Type: bug

apache/arrow-java#939 · 4 comments · 1 reaction · 1 assignee · Opened Dec 29, 2025
flight-sql-jdbc-driver: add option to rely on Arrow Flight SQL Bulk Ingestion for batched inserts Open

Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

apache/arrow-java#931 · 2 comments · Opened Dec 11, 2025
JDBC driver does not support compressed IPC streams (ZSTD, LZ4) [FlightSQL] Open

help wanted Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

apache/arrow-java#926 · 2 comments · Opened Dec 2, 2025
Calling `retain` on a closed ArrowBuf revives it, into an undefined state Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

apache/arrow-java#906 · 8 comments · Opened Nov 5, 2025
[CI] JNI jobs fail to install archery due to old Python version on images Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

apache/arrow-java#875 · Opened Oct 7, 2025

apache/arrow-java

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