apache/gluten

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Gluten is a middle layer responsible for offloading JVM-based SQL engines' execution to native engines.

Stars: 1.6k
Forks: 661
Open beginner issues: 5
Indexed issues: 901
Avg merge: 4d 9h
Merged PRs (30d): 74

Dominant language: Scala
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

893 open issues indexed

[VL] madvise(WILLNEED) call fails in MmapFileStream because of wrong calculation of fetching length Open

bug triage

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

apache/gluten#13062 · Opened Sep 20, 2026
[VL] Spark 4.2: Add new UTs — SQL DataSource V2 connector suites Open

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

apache/gluten#13049 · Opened Sep 17, 2026
[VL] Spark 4.2: Add newly introduced Spark 4.2 unit tests to Gluten Open

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

apache/gluten#13048 · 2 comments · Opened Sep 17, 2026
[CORE] Fix spurious OOM in DynamicOffHeapSizingMemoryTarget caused by using committed heap instead of actual used heap Open

bug triage

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

apache/gluten#13044 · Opened Sep 17, 2026
[CI] Extract temporary Delta test patches from setup script Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

apache/gluten#13037 · Opened Sep 16, 2026
[CI] MinIO binary download from dl.min.io returns HTTP 410 Open

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

apache/gluten#13011 · Opened Sep 14, 2026
[CORE] Remaining Spark 3.3 cleanup after #12902 Open

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

apache/gluten#13003 · Opened Sep 12, 2026
[BOLT] backends-bolt is not covered by CI and has drifted from the shared APIs Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

apache/gluten#12998 · 1 comment · Opened Sep 11, 2026
[CORE] Drop the now-constant ">= 3.4" test gates Open

good first issue

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

apache/gluten#12992 · Opened Sep 10, 2026
[CORE] Remove the leftover PromotePrecision shim and its decimal rescale path Open

apache/gluten#12991 · 4 comments · 1 assignee · Opened Sep 10, 2026
[CH] Thirteen ClickHouse test cases are permanently ignored after the Spark 3.3 removal Open

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

apache/gluten#12988 · Opened Sep 9, 2026
[VL] Native Parquet writer ignores the parquet.compression table property Open

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

apache/gluten#12987 · Opened Sep 9, 2026
VeloxRssSortShuffleReaderDeserializer: infinite loop on EOS mid-page and corrupted deserialization on multi-window Presto pages Open

bug triage

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

apache/gluten#12985 · 1 comment · 1 assignee · Opened Sep 9, 2026
[CORE] Further SparkShims dedup left out of the Spark 3.3 shim cleanup Open

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

apache/gluten#12953 · Opened Sep 2, 2026
[CH] Decide the fate of the ClickHouse Iceberg Java tests, which no build compiles today Open

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

apache/gluten#12934 · 1 comment · Opened Aug 31, 2026
[BUILD] `iceberg` and `iceberg-test` profiles collide on one build-helper execution id, silently dropping `src-iceberg/test` sources Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

apache/gluten#12933 · Opened Aug 31, 2026
[VL] Defer literal node construction for InSet to reduce memory Open

enhancement

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

apache/gluten#12924 · Opened Aug 28, 2026
[VL] Support full outer BroadcastNestedLoopJoin with plan rewrite Open

enhancement

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

apache/gluten#12921 · Opened Aug 28, 2026
TableScan meets the issue pools_.size() != 0 (1 vs 0) Open

bug triage

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

apache/gluten#12911 · 13 comments · Opened Aug 27, 2026
Is the ubuntu22-m2-cache docker image still used by anything? Open

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

apache/gluten#12904 · 1 comment · Opened Aug 26, 2026
[VL][TEST] gluten-ut/spark34 matches the SQL query test list with contains, 3.5+ with equals Open

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

apache/gluten#12897 · Opened Aug 25, 2026
[VL] No ANSI-on cast coverage on Spark 3.4/3.5, and velox_backend_ansi.yml has no jobs for them Open

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

apache/gluten#12892 · Opened Aug 25, 2026
[CH] Six ClickHouse suites run only on gluten-ut/spark33 and will stop running when it is removed Open

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

apache/gluten#12891 · Opened Aug 25, 2026
[CH] Record the real fallbackSummary node counts on ClickHouse so GlutenImplicitsTest can stop skipping three cases Open

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

apache/gluten#12862 · Opened Aug 22, 2026
gluten-ut: GlutenCachedTableSuite silently loses spark.sql.shuffle.partitions=5 Open

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

apache/gluten#12861 · Opened Aug 22, 2026
gluten-ut: checkConsistencyBetweenInterpretedAndCodegen never reaches the backend Open

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

apache/gluten#12860 · Opened Aug 22, 2026
gluten-ut: two commented-out null assertions in the unhex case already pass on Velox Open

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

apache/gluten#12859 · Opened Aug 22, 2026
gluten-ut: the flatten function case caches three DataFrames and never unpersists them Open

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

apache/gluten#12858 · Opened Aug 22, 2026
[VL] DPP V1 DisableScan/DisableProject suites extend the V2 base class, so the V1 path is never covered Open

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

apache/gluten#12857 · Opened Aug 22, 2026
[VL] GlutenHiveSQLQuerySuite leaks Hive tables on failure: cleanup sits outside withTable/finally Open

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

apache/gluten#12856 · 1 comment · Opened Aug 22, 2026
[CH] findTopLevelSortMergeJoinTransform never matches on ClickHouse, so the migrated SPARK-37652 skew-join case is ignored on 3.4+ Open

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

apache/gluten#12845 · Opened Aug 21, 2026
[CH] ReadFromGlutenStorageKafka stores column_names as a dangling const Names& reference Open

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

apache/gluten#12843 · Opened Aug 20, 2026
[CH] Discriminate MergeTree/Range ExtensionTable reads by type_url, not isMergeTree=/isRange= marker strings Open

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

apache/gluten#12842 · Opened Aug 20, 2026
[VL] unix_timestamp reject non-ASCII (Unicode Nd) digits Open

bug triage

Difficulty 3/5 1-2 days Newbie friendliness 58/100

apache/gluten#12825 · 1 comment · Opened Aug 19, 2026
[VL] Deprecate Spark-33 support Open

enhancement good first issue

apache/gluten#12807 · 4 comments · 2 reactions · 1 assignee · Opened Aug 18, 2026
[FLINK][VL] Stateful key hash collision: hash value used as key identity causes data corruption Open

bug triage

apache/gluten#12805 · 3 comments · 1 reaction · 1 assignee · Opened Aug 18, 2026
Native-handled PushedFilters are not marked with `*` in file-source scan plans Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

apache/gluten#12753 · Opened Aug 11, 2026
[Umbrella] Delta-on-Gluten: follow-ups after the Delta Spark UT pipeline Open

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

apache/gluten#12743 · 3 comments · Opened Aug 10, 2026
[VL] IcebergScanTransformer.getRootPathsInternal always returns Seq.empty, silently skipping native filesystem scheme validation Open

bug triage

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

apache/gluten#12712 · 1 reaction · Opened Aug 6, 2026
[VL] Document CA bundle path fix for S3 hang on non-RHEL runtime images (root cause of #10670) Open

enhancement

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

apache/gluten#12711 · 2 comments · 1 reaction · Opened Aug 6, 2026
[VL] Iceberg REST-catalog vended credentials (Polaris etc.) never reach the native S3 reader — native scans 403 while vanilla Spark reads fine Open

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

apache/gluten#12701 · 1 comment · Opened Aug 5, 2026
[CORE][VL] No Iceberg-specific switch to enable/disable Iceberg read and write offload Open

enhancement

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

apache/gluten#12698 · 1 reaction · Opened Aug 5, 2026
[CORE] Native conf passing is decided by hard-coded string key lists Open

enhancement

apache/gluten#12694 · 1 assignee · Opened Aug 5, 2026
[VL] Align standalone Arrow native and Java versions Open

enhancement velox backend

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

apache/gluten#12673 · Opened Aug 1, 2026
[VL] Velox memCache is invisible to Spark's memory manager Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 42/100

apache/gluten#12671 · Opened Aug 1, 2026
[FLINK] Support common stateless scalar expressions Open

enhancement

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

apache/gluten#12665 · Opened Jul 31, 2026
Gluten consumes much higher memory and created much larger bloomfilter subquery datasize than Spark Open

bug triage

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

apache/gluten#12659 · 2 comments · Opened Jul 30, 2026
[VL] Flaky test from Spark-40 and Spark-41 Open

bug triage

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

apache/gluten#12649 · 1 comment · Opened Jul 29, 2026
[VL] Support Iceberg V3 deletion vectors in Velox Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

apache/gluten#12628 · Opened Jul 26, 2026
[VL] Result of cast(double/double AS DECIMAL (18,2) ) is inconsistent with vanilla spark Open

bug triage

apache/gluten#12607 · 2 comments · 1 assignee · Opened Jul 23, 2026

apache/gluten

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