apache/datafusion

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Apache DataFusion SQL Query Engine

Stars: 9.3k
Forks: 2.4k
Open beginner issues: 0
Indexed issues: 1.8k
Avg merge: 3d 6h
Merged PRs (30d): 363

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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1,799 open issues indexed

Tweak optimal default batch size Open

enhancement performance

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

apache/datafusion#6916 · 1 comment · Opened Jul 11, 2023
Improve the hash join performance by replacing the RawTable to a hash table that supports prefetching Open

enhancement performance

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

apache/datafusion#6910 · 7 comments · Opened Jul 11, 2023
Write tests for streaming_merge Open

enhancement

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

apache/datafusion#6907 · 1 comment · Opened Jul 10, 2023
support: Date +/plus Int or date_add function Open

enhancement

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

apache/datafusion#6876 · 11 comments · Opened Jul 7, 2023
Substrait: Add SubqueryAlias support Open

enhancement substrait

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

apache/datafusion#6867 · 4 comments · Opened Jul 6, 2023
General ticket for Array/List data type Open

enhancement

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

apache/datafusion#6863 · 2 comments · 2 reactions · Opened Jul 6, 2023
to_string and from_string have different behavior for TableReference Open

bug

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

apache/datafusion#6853 · 3 comments · Opened Jul 5, 2023
Support array concat with different dimensions Open

enhancement

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

apache/datafusion#6849 · 1 comment · 1 reaction · Opened Jul 5, 2023
Use Specialization Instead of ScalarValue Binary Operations Open

enhancement

apache/datafusion#6842 · 2 comments · 3 reactions · 1 assignee · Opened Jul 4, 2023
Speed up hash partitioning Open

enhancement performance

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

apache/datafusion#6822 · 5 comments · Opened Jul 2, 2023
Сustomize behavior of NULLS in array functions Open

enhancement

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

apache/datafusion#6808 · Opened Jun 30, 2023
Array comparision Open

enhancement

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

apache/datafusion#6806 · Opened Jun 30, 2023
The `dict_id` was lost when constructing the logic plan. Open

bug

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

apache/datafusion#6784 · 7 comments · Opened Jun 28, 2023
Unable to determine return type for function `ArrayFill` Open

bug

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

apache/datafusion#6779 · Opened Jun 27, 2023
Improve default output column names Open

enhancement

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

apache/datafusion#6758 · Opened Jun 24, 2023
RFC: Rename OptimizerConfig to OptimizerProps Open

enhancement

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

apache/datafusion#6741 · 5 comments · Opened Jun 22, 2023
`FieldNotFound` but field is shown in `valid_fields` Open

bug

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

apache/datafusion#6699 · 2 comments · Opened Jun 16, 2023
[EPIC] Avoid sort for already sorted Parquet files that do not overlap values on condition Open

enhancement performance PROPOSAL EPIC question

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

apache/datafusion#6672 · 9 comments · Opened Jun 14, 2023
Support different types of Hash tables in Grouping/Aggregation Open

enhancement

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

apache/datafusion#6670 · 2 comments · 1 reaction · Opened Jun 14, 2023
Write `Signature` method for list datatypes. Open

enhancement

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

apache/datafusion#6559 · 1 comment · Opened Jun 6, 2023
Support columns having the same alias Open

bug

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

apache/datafusion#6543 · 24 comments · 1 reaction · Opened Jun 5, 2023
array_agg panics on large rows. Open

bug

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

apache/datafusion#6524 · 13 comments · Opened Jun 2, 2023
octet_length(char) doesn't behave as expected. Open

bug

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

apache/datafusion#6508 · 2 comments · Opened May 31, 2023
Consider providing an option for dynamic linking Open

enhancement

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

apache/datafusion#6470 · 5 comments · 1 reaction · Opened May 28, 2023
Inconsistent `IS NOT NULL` filters for joins Open

bug

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

apache/datafusion#6432 · 4 comments · Opened May 23, 2023
Sqllogictests doesn't cover cases if the column name is not expected. Open

enhancement

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

apache/datafusion#6349 · 3 comments · Opened May 14, 2023
Correct way to `register_listing_table` on specific catalog / schema? Open

question

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

apache/datafusion#6289 · 4 comments · Opened May 8, 2023
More intuitive CLI query parsing error reporting Open

enhancement

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

apache/datafusion#6267 · Opened May 6, 2023
RFC: Add `result type` for Expr Open

enhancement

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

apache/datafusion#6261 · 7 comments · Opened May 6, 2023
Support WITH clause in CREATE TABLE Statements Open

enhancement

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

apache/datafusion#6238 · 1 comment · 2 reactions · Opened May 4, 2023
What is the easiest way to turn statements into JSON? Open

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

apache/datafusion#6227 · 2 comments · Opened May 4, 2023
Implement expression simplification for filtering (vs generically) Open

enhancement

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

apache/datafusion#6179 · 6 comments · 1 reaction · Opened May 1, 2023
Add "first impression" benchmark to bench.sh Open

enhancement

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

apache/datafusion#6156 · 2 comments · Opened Apr 28, 2023
Add support for correlated subquery Open

enhancement

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

apache/datafusion#6140 · 7 comments · Opened Apr 27, 2023
Remove indices from GroupState Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 30/100

apache/datafusion#6104 · 1 comment · Opened Apr 24, 2023
Nested coalesce Open

enhancement

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

apache/datafusion#6074 · 3 comments · Opened Apr 20, 2023
Build join schema in a single place Open

enhancement

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

apache/datafusion#6046 · 3 comments · Opened Apr 18, 2023
Cross-schema/cross-catalog qualified column doesn't do ambiguity check Open

bug

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

apache/datafusion#6012 · 2 comments · Opened Apr 14, 2023
logical_plan optimize for MemTable will cost more time when collect dataframe Open

enhancement

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

apache/datafusion#6006 · 1 comment · Opened Apr 14, 2023
Include example codes in version update script Open

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

apache/datafusion#5983 · Opened Apr 13, 2023
Include the latest rustdocs (e.g. `cargo doc` output on https://arrow.apache.org/datafusion/) Open

documentation enhancement

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

apache/datafusion#5981 · 2 comments · Opened Apr 12, 2023
Allow providing Arrow schema when scanning Parquet files Open

enhancement

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

apache/datafusion#5950 · 3 comments · 1 reaction · Opened Apr 11, 2023
Type coercion should select cheapest cast. Open

bug

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

apache/datafusion#5928 · Opened Apr 9, 2023
[Epic] Enhance Type coercion Open

enhancement PROPOSAL EPIC

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

apache/datafusion#5927 · Opened Apr 9, 2023
Between Composition Open

enhancement

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

apache/datafusion#5925 · Opened Apr 8, 2023
Reordering of predicates Open

enhancement

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

apache/datafusion#5924 · 3 comments · 4 reactions · Opened Apr 8, 2023
[EPIC] More SQL optimizer optimizations for Datafusion Open

enhancement PROPOSAL EPIC

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

apache/datafusion#5923 · 3 comments · 2 reactions · Opened Apr 8, 2023
Predicate Move-Around Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 15/100

apache/datafusion#5922 · Opened Apr 8, 2023
Implement `with_timezone` function Open

enhancement

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

apache/datafusion#5905 · Opened Apr 7, 2023
Timestamps having different timezone cannot be represented in the same field of a schema Open

enhancement

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

apache/datafusion#5823 · 1 comment · 1 reaction · Opened Apr 1, 2023

apache/datafusion

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