apache/parquet-java

Apache Parquet Java

Stars: 3.1k
Forks: 1.6k
Open beginner issues: 9
Indexed issues: 582
Avg merge: 4d 3h
Merged PRs (30d): 32

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 20, 2026
Latest indexed: Sep 14, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

Preserve physical leaf identity for duplicate primitive root paths Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3795 · Opened Sep 16, 2026
AvroIndexedRecordConverter resolves aliases before the exact field name Open

Type: bug

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

apache/parquet-java#3792 · Opened Sep 14, 2026
Decouple parquet-hadoop module from hadoop-mapreduce-client-core Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 68/100

apache/parquet-java#3780 · Opened Sep 6, 2026
Bulk skip in RunLengthBitPackingHybridDecoder / DictionaryValuesReader Open

Type: enhancement

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

apache/parquet-java#3772 · Opened Sep 4, 2026
Make PageReader AutoCloseable Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

apache/parquet-java#3767 · Opened Sep 4, 2026
parquet-protobuf: recursion truncation breaks repeated and map fields — ClassCastException in specs-compliant mode, file corruption in the old style Open

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

apache/parquet-java#3751 · Opened Aug 26, 2026
Add batch/columnar write API for Arrow VectorSchemaRoot (Java parity with C++/Python) Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

apache/parquet-java#3733 · Opened Aug 20, 2026
Vectored Parquet reads can fall back unsafely after partial asynchronous reads and exceed allocation limits Open

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

apache/parquet-java#3719 · Opened Aug 14, 2026
[parquet-java] Intermittent out-of-bounds dictionary ID when reading dictionary-encoded Parquet pages Open

Type: bug

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

apache/parquet-java#3715 · Opened Aug 10, 2026
Page header uncompressed_page_size exceeds the actual decompressed payload by 2 bytes on ZSTD + dictionary-encoded ARRAY<ARRAY<BIGINT>> columns Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3712 · 6 comments · Opened Aug 7, 2026
ParquetFileWriter.end() flushes an incomplete file to storage when finalizing fails Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3706 · Opened Aug 4, 2026
Reuse hadoop file status and footer in ParquetRecordReader Open

Type: enhancement

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

apache/parquet-java#3697 · Opened Jul 30, 2026
Cache ParsedVersion in FileMetaData to eliminate redundant created_by parsing Open

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

apache/parquet-java#3696 · Opened Jul 29, 2026
Remove duplicate LICENSE and NOTICE files from benchmark JARs Open

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

apache/parquet-java#3695 · 1 comment · Opened Jul 29, 2026
Libraries 1.17.1 fails vulnerability scans Open

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

apache/parquet-java#3693 · 2 reactions · Opened Jul 27, 2026
Add `.rat-excludes` file Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3691 · 1 comment · Opened Jul 26, 2026
Audit third-party code bundled in published JARs Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3690 · 3 comments · 1 reaction · Opened Jul 26, 2026
Ensure all published JARs contain correct LICENSE and NOTICE files Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3687 · Opened Jul 26, 2026
Source-distribution builds leave `${buildNumber}` unresolved in version metadata Open

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

apache/parquet-java#3682 · Opened Jul 22, 2026
Isolate Avro usage in parquet-cli to commands that require Avro Open

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

apache/parquet-java#3672 · 1 comment · Opened Jul 17, 2026
Add integration tests for all `parquet-testing` files Open

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

apache/parquet-java#3670 · 4 comments · Opened Jul 17, 2026
When planning to release with Vulnerability Fix CVE-2026-54512 and CVE-2026-54513 Open

Type: bug

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

apache/parquet-java#3668 · 2 comments · Opened Jul 16, 2026
Close input readers when ParquetRewriter setup fails Open

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

apache/parquet-java#3667 · Opened Jul 16, 2026
Older `parquet-java` readers fail on files with unprojected VARIANT columns Open

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

apache/parquet-java#3633 · 1 comment · Opened Jun 27, 2026
Introduce AssertJ for testing Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 62/100

apache/parquet-java#3615 · Opened Jun 19, 2026
Add new sort order for int96 timestamps Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3609 · Opened Jun 11, 2026
Setting parquet.thrift.string.size.limit = -1 incorrectly throws Open

Type: bug

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

apache/parquet-java#3587 · Opened May 26, 2026
null_count is omitted for large columns in parquet files Open

Type: bug

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

apache/parquet-java#3574 · 1 comment · Opened May 22, 2026
Harden variant decoding Open

Type: enhancement

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

apache/parquet-java#3561 · Opened May 14, 2026
Properly close buffers Open

Type: enhancement

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

apache/parquet-java#3558 · Opened May 13, 2026
Automate the Release Process Open

Type: enhancement

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

apache/parquet-java#3547 · 4 comments · 2 reactions · Opened May 6, 2026
Apache Parquet Java Performance Improvements Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

apache/parquet-java#3530 · 5 comments · 7 reactions · Opened Apr 28, 2026
Variant getFieldByKey() on large objects silently fails if variant metadata is unsorted Open

Type: bug

apache/parquet-java#3529 · 4 comments · 1 assignee · Opened Apr 27, 2026
Breaking change in Avro 1.12.1 affects parquet-avro users: logical types now deserialize to different Java types Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3515 · 1 comment · Opened Apr 21, 2026
Reduce allocation overhead of no-op `GeospatialStatistics.Builder` Open

Type: enhancement

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

apache/parquet-java#3507 · Opened Apr 19, 2026
Avoid per-write virtual dispatch in `DictionaryValuesWriter.shouldFallBack()` by caching the size-exceeded check Open

Type: enhancement

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

apache/parquet-java#3501 · Opened Apr 19, 2026
`RequiresFallback.isCompressionSatisfying` is too aggressive with current default page size Open

Type: enhancement

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

apache/parquet-java#3479 · 1 comment · 1 reaction · Opened Apr 14, 2026
AvroSchemaConverter silently drops typed_value when converting shredded variant schemas Open

Type: bug

apache/parquet-java#3477 · 6 comments · 1 assignee · Opened Apr 14, 2026
Error which block the compilation Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 20/100

apache/parquet-java#3468 · Opened Apr 7, 2026
Improve `RunLengthBitPackingHybridDecoder.readNext` to avoid per-call buffer allocation and `DataInputStream` wrapping Open

Type: enhancement

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

apache/parquet-java#3466 · Opened Apr 6, 2026
Support stale PR workflow for inactive pull requests Open

Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3408 · Opened Mar 1, 2026
Add support for Parquet Input Stream optimisations. Open

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

apache/parquet-java#3386 · 4 comments · Opened Jan 7, 2026
[parquet-cli] Illegal character in column name Open

Type: bug

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

apache/parquet-java#3364 · Opened Dec 2, 2025
TestParquetReader fails with hadoop 3.4.2 Open

Type: bug

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

apache/parquet-java#3356 · 4 comments · Opened Nov 13, 2025
The error message "is not a Parquet file" doesn't show the Parquet path anymore Open

Type: bug

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

apache/parquet-java#3354 · 1 comment · Opened Nov 7, 2025
Why no bulk Arrow→Parquet write API in Java? How to avoid row-by-row RecordConsumer + optimize? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3353 · 1 comment · 1 reaction · Opened Nov 6, 2025
parquet-cli cannot display data containing int96 type Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

apache/parquet-java#3345 · 1 reaction · Opened Oct 10, 2025
Make compression adaptive with V2 data pages Open

Good first issue Type: enhancement

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

apache/parquet-java#3344 · 3 comments · Opened Oct 8, 2025
Throw typed exception for Parquet footer error Open

Type: enhancement

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

apache/parquet-java#3342 · Opened Oct 2, 2025
Hadoop parquet reader (and parquet-CLI) fails on some files from parquet-testing Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3336 · 4 comments · Opened Sep 26, 2025

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