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 20, 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

Spurious cast to Uint8 inserted when coalesce is used in a context of a join Open

bug

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

apache/datafusion#5694 · 1 comment · Opened Mar 22, 2023
Logical Expr serde should be stack safe Open

enhancement

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

apache/datafusion#5693 · 3 comments · Opened Mar 22, 2023
Document protobuf Open

enhancement

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

apache/datafusion#5678 · Opened Mar 22, 2023
Group by duplicate GROUPING SETS returns wrong result Open

bug

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

apache/datafusion#5672 · 1 comment · 1 reaction · Opened Mar 21, 2023
Quote column only if has special characters in `TableReference ` Open

enhancement

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

apache/datafusion#5666 · Opened Mar 21, 2023
Count() and Count(Distinct )should accept multiple exprs Open

enhancement

apache/datafusion#5619 · 2 comments · 1 assignee · Opened Mar 16, 2023
`Statistics::is_exact` semantics Open

bug

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

apache/datafusion#5613 · 5 comments · Opened Mar 15, 2023
[DISCUSS] Use semantic PR titles to help with change log generation? Open

development-process

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

apache/datafusion#5601 · 5 comments · Opened Mar 14, 2023
Push Down Offset to TableScan Open

enhancement

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

apache/datafusion#5562 · Opened Mar 12, 2023
Support casting from UTF8 --> FixedSizeBinary, Binary --> FixedSizedBinary Open

enhancement

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

apache/datafusion#5530 · 1 comment · Opened Mar 9, 2023
Support multiple namespaces within catalogs Open

enhancement

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

apache/datafusion#5528 · Opened Mar 9, 2023
`all_schema()` will skip ExtensionPlan's own schema and fetches schemas from children plans Open

bug

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

apache/datafusion#5513 · 2 reactions · Opened Mar 8, 2023
Run DataFusion benchmarks regularly and track performance history over time Open

enhancement help wanted performance

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

apache/datafusion#5504 · 46 comments · 4 reactions · Opened Mar 7, 2023
Add support for JSONPath functions Open

enhancement

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

apache/datafusion#5493 · 1 comment · 3 reactions · Opened Mar 7, 2023
General framework to decorrelate the subqueries Open

enhancement

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

apache/datafusion#5492 · 37 comments · Opened Mar 7, 2023
Additional ideas for optimizing subqueries Open

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

apache/datafusion#5484 · 2 comments · Opened Mar 5, 2023
[EPIC] More Subquery support Open

enhancement PROPOSAL EPIC

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

apache/datafusion#5483 · 7 comments · Opened Mar 5, 2023
Writing to CSV create multiple partition file but other files are empty except partition Zero Open

bug

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

apache/datafusion#5467 · 1 comment · Opened Mar 3, 2023
Rework `ParquetExec::metadata_size_hint` Open

enhancement

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

apache/datafusion#5466 · 3 comments · Opened Mar 3, 2023
`rpad` function causes OOM Open

bug

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

apache/datafusion#5415 · 5 comments · Opened Feb 27, 2023
VARCHAR and INT comparison in query Open

bug

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

apache/datafusion#5414 · 1 comment · Opened Feb 27, 2023
Eliminate SubqueryAlias Open

enhancement help wanted

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

apache/datafusion#5407 · 5 comments · Opened Feb 26, 2023
split out configuration (SessionState, ConfigOptions, etc) into datafusion-execution Open

apache/datafusion#5405 · 1 assignee · Opened Feb 26, 2023
Support rewrite multiple COUNT(DISTINCT expr) Open

enhancement

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

apache/datafusion#5360 · 4 comments · 1 reaction · Opened Feb 22, 2023
Add Backtraces to DataFusionError Open

enhancement

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

apache/datafusion#5283 · 2 comments · 1 reaction · Opened Feb 14, 2023
Enrich errors with table name for format or parsing errors Open

enhancement

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

apache/datafusion#5266 · Opened Feb 13, 2023
Use `_dyn` and `_scalar_dyn` for operations `like`, `ilike`, `nlike`, and `nilike` to support Dictionary and LargeStringArray Open

enhancement

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

apache/datafusion#5222 · Opened Feb 9, 2023
CLI query result header for cast expressions with literals is confusing Open

bug

apache/datafusion#5221 · 7 comments · 1 reaction · 1 assignee · Opened Feb 8, 2023
FileStream: Buffer more than one `FileOpenFuture` Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 32/100

apache/datafusion#5209 · 1 comment · Opened Feb 7, 2023
Add ability to process CSV files containing invalid UTF-8 characters Open

enhancement

apache/datafusion#5204 · 7 comments · 1 assignee · Opened Feb 6, 2023
write blog post about Substrait donation Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

apache/datafusion#5201 · Opened Feb 6, 2023
Invalid partition scheme in sort if intermediate projection has dropped a partition column Open

bug

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

apache/datafusion#5184 · 2 comments · Opened Feb 5, 2023
Add extra configuration to `ParquetExec` to support saveModes Open

enhancement

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

apache/datafusion#5119 · Opened Jan 31, 2023
Automatically call ListingTableConfig.infer() Open

enhancement

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

apache/datafusion#5112 · 1 reaction · Opened Jan 30, 2023
Conditional expressions should only evaluate "else" predicate if "if" predicate is false Open

bug

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

apache/datafusion#5093 · 3 comments · Opened Jan 27, 2023
"corrupt deflate stream" when inferring schema from CSV file during CREATE EXTERNAL TABLE Open

bug

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

apache/datafusion#5041 · 1 comment · Opened Jan 24, 2023
[DISCUSS] publishing nightly / non-official releases to crates.io (even more frequent releases) Open

enhancement

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

apache/datafusion#5023 · 9 comments · Opened Jan 22, 2023
DataFrame write api should accept Overwrite option when the file already exist Open

enhancement

apache/datafusion#4986 · 2 comments · 1 reaction · 1 assignee · Opened Jan 19, 2023
Changelog generator not working for patch releases Open

bug development-process

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

apache/datafusion#4985 · Opened Jan 19, 2023
Sometimes Filters are not repartitioned when they could be Open

bug optimizer

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

apache/datafusion#4967 · 1 reaction · Opened Jan 18, 2023
Read DataFrame from URL Open

enhancement

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

apache/datafusion#4965 · 3 comments · Opened Jan 18, 2023
Incorrect Schema Adaption for CSV Open

bug

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

apache/datafusion#4918 · 6 comments · Opened Jan 15, 2023
Add `ApplyOrder::Recursive` to replace `None: Option<ApplyOrder>` and remove nested pattern matching. Open

enhancement

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

apache/datafusion#4917 · 4 comments · 1 reaction · Opened Jan 15, 2023
Improved performance of RANGE window functions using Segment Trees Open

enhancement

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

apache/datafusion#4904 · 4 comments · Opened Jan 14, 2023
Consider making the DataFrame API less verbose by imitating Polars Open

enhancement

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

apache/datafusion#4890 · 1 comment · Opened Jan 13, 2023
SQL on DataFrames Open

enhancement

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

apache/datafusion#4889 · 1 comment · 1 reaction · Opened Jan 13, 2023
[Question] About UUID support and data types widening Open

enhancement

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

apache/datafusion#4827 · 1 comment · Opened Jan 5, 2023
Support Gap Filling on Time Series Data Open

enhancement

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

apache/datafusion#4809 · 22 comments · 5 reactions · Opened Jan 3, 2023
test cases in the UT level for page filter Open

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

apache/datafusion#4791 · Opened Jan 2, 2023
[EPIC] Support TPC-DS benchmarks Open

enhancement PROPOSAL EPIC

apache/datafusion#4763 · 9 comments · 3 reactions · 1 assignee · Opened Dec 28, 2022

apache/datafusion

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