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tamnd/firepanda

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A dataframe library for Mojo with the pandas API. Vectorized columnar engine, Arrow memory, zero Python in the hot path — and pip install firepanda for people who never touch a Mojo toolchain.

Is tamnd/firepanda beginner-friendly?

The maintainers of tamnd/firepanda usually reply to a pull request within 1 day. 1 beginner-friendly issue is open now.

Stars
1
Forks
0
Open beginner issues
1
Indexed issues
109
Avg merge
1h 17m
Merged PRs (30d)
980
Dominant language
Mojo
License
Apache-2.0
Last GitHub push
Sep 18, 2026
Latest indexed
Sep 16, 2026
Contributing guide
Code of conduct
Beginner labels
good first issue

How to contribute to tamnd/firepanda

  1. Read the contributing guide first: it says how the maintainers want changes proposed, tested and reviewed.
  2. Read its code of conduct: it covers issues and pull requests as well as chat.
  3. Your contributions will be published under the project's Apache-2.0 license.
  4. Pick the open beginner-friendly issue below and comment that you want to work on it before you start.
Beginner friendly Everything
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Issues somebody may already be working on are listed last. List everything by date

  • Soak run failing
    Open
    • Is something wrong?
    test

    Difficulty 3/5 1-2 days Newbie friendliness 65/100

    tamnd/firepanda#1005 · 7 comments ·

    Maintainers usually reply within 1 day

  • The SQL front end costs about two and a half milliseconds a statement before any work starts
    Open
    • Is something wrong?
    area/plan performance

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

    tamnd/firepanda#999 · 9 comments ·

    Maintainers usually reply within 1 day

  • A streaming group by on a text key hands out ordinals on one thread
    Open
    • Is something wrong?
    area/exec area/kernel performance

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

    tamnd/firepanda#997 · 3 comments ·

    Maintainers usually reply within 1 day

  • One encoding layer under the logical type, for the 303 MB and the 109 seconds
    Open
    • Is something wrong?
    area/arrow area/kernel area/string performance

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

    tamnd/firepanda#979 · 9 comments ·

    Maintainers usually reply within 1 day

  • CI wall clock: what is left after the compiler cache
    Open
    • Is something wrong?
    ci performance test

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

    tamnd/firepanda#968 · 6 comments ·

    Maintainers usually reply within 1 day

  • DuckDB grammar has moved
    Open
    • Is something wrong?
    area/sql dependencies upstream

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

    tamnd/firepanda#941 · 1 comment ·

    Maintainers usually reply within 1 day

  • A fourth word on Buffer costs half a megabyte of code
    Open
    • Is something wrong?
    area/kernel performance

    Difficulty 5/5 Over a week Newbie friendliness 48/100

    tamnd/firepanda#811 ·

    Maintainers usually reply within 1 day

  • A series name that can be absent rather than empty
    Open
    • Is something wrong?

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

    tamnd/firepanda#599 ·

    Maintainers usually reply within 1 day

  • M2b.1: Selection vectors, so a filter stops copying
    Open
    • Is something wrong?
    area/exec area/kernel enhancement milestone performance

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

    tamnd/firepanda#521 · 15 comments ·

    Maintainers usually reply within 1 day

  • A4. `DatetimeIndex`, 144 members, L3 90 percent
    Open
    • Is something wrong?

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

    tamnd/firepanda#495 ·

    Maintainers usually reply within 1 day

  • M6b: ClickBench readiness
    Open
    • Is something wrong?
    area/benchmark area/frame area/string milestone performance

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

    tamnd/firepanda#477 · 63 comments ·

    Maintainers usually reply within 1 day

  • A category column can only hold text, so astype("category") on numbers refuses
    Open
    • Is something wrong?

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

    tamnd/firepanda#450 ·

    Maintainers usually reply within 1 day

  • A series with no name reports an empty string where pandas reports None
    Open
    • Is something wrong?

    Difficulty 5/5 Over a week Newbie friendliness 45/100

    tamnd/firepanda#435 ·

    Maintainers usually reply within 1 day

  • A categorical has no type object, so there is no way to say the categories and the order at once
    Open
    • Is something wrong?

    Difficulty 5/5 Over a week Newbie friendliness 45/100

    tamnd/firepanda#433 · 2 comments ·

    Maintainers usually reply within 1 day

  • The Parquet read holds two copies of the table, and that is where the peak is
    Open
    • Is something wrong?
    area/arrow area/io performance

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

    tamnd/firepanda#427 · 6 comments ·

    Maintainers usually reply within 1 day

  • Six raises carry the wrong kind, so the except clause around them does not fire
    Open
    • Is something wrong?

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

    tamnd/firepanda#410 · 1 comment ·

    Maintainers usually reply within 1 day

  • Peak RSS is 2x polars and has not moved
    Open
    • Is something wrong?
    area/exec area/streaming performance

    Difficulty 5/5 Over a week Newbie friendliness 45/100

    tamnd/firepanda#405 · 6 comments ·

    Maintainers usually reply within 1 day

  • astype resolves longdouble differently from pandas on x86
    Open
    • Is something wrong?
    area/python bug

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

    tamnd/firepanda#403 ·

    Maintainers usually reply within 1 day

  • The extension segfaults on import into a free threaded interpreter
    Open
    • Is something wrong?
    area/python bug ci toolchain

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

    tamnd/firepanda#400 ·

    Maintainers usually reply within 1 day

  • M2c.5: The physical operators the plan needs and exec does not have
    Open
    • Is something wrong?
    area/exec area/plan milestone

    Difficulty 4/5 3-5 days Newbie friendliness 58/100

    tamnd/firepanda#380 ·

    Maintainers usually reply within 1 day

  • M2c.4: Join ordering, and the estimates we refuse to build
    Open
    • Is something wrong?
    area/plan milestone performance

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

    tamnd/firepanda#379 ·

    Maintainers usually reply within 1 day

  • M2c.3: Predicate transfer and runtime join filters
    Open
    • Is something wrong?
    area/hash area/plan milestone performance

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

    tamnd/firepanda#378 ·

    Maintainers usually reply within 1 day

  • M2c.2: The optimizer pass pipeline
    Open
    • Is something wrong?
    area/plan milestone performance

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

    tamnd/firepanda#377 · 10 comments ·

    Maintainers usually reply within 1 day

  • M2c.1: The plan layer, the IR and binding
    Open
    • Is something wrong?
    area/exec area/plan milestone

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

    tamnd/firepanda#376 · 3 comments ·

    Maintainers usually reply within 1 day

  • M2c.0: Stage zero, the decisions that need no plan
    Open
    • Is something wrong?
    area/frame area/hash milestone performance

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

    tamnd/firepanda#375 · 4 comments ·

    Maintainers usually reply within 1 day

  • M2c: The planner
    Open
    • Is something wrong?
    area/exec area/plan milestone performance

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

    tamnd/firepanda#372 · 5 comments ·

    Maintainers usually reply within 1 day

  • The Mojo 1.0 compiler hangs on a recursive expression transformer
    Open
    • Is something wrong?
    area/sql toolchain upstream

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

    tamnd/firepanda#369 ·

    Maintainers usually reply within 1 day

  • to_datetime answers a Series where pandas answers a DatetimeIndex
    Open
    • Is something wrong?

    Difficulty 1/5 Under an hour Newbie friendliness 68/100

    tamnd/firepanda#354 · 1 comment ·

    Maintainers usually reply within 1 day

  • to_datetime on a column that is neither text nor whole numbers
    Open
    • Is something wrong?

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

    tamnd/firepanda#353 ·

    Maintainers usually reply within 1 day

  • One dt accessor where pandas has two, and the error a caller sees for it
    Open
    • Is something wrong?

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

    tamnd/firepanda#350 ·

    Maintainers usually reply within 1 day

  • The dt arguments that are declared and refused, and the zone database behind half of them
    Open
    • Is something wrong?

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

    tamnd/firepanda#349 ·

    Maintainers usually reply within 1 day

  • The five dt names that are absent because the column type is
    Open
    • Is something wrong?

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

    tamnd/firepanda#347 ·

    Maintainers usually reply within 1 day

  • The groupby surface has sixteen callables with proven behaviour and no Python door
    Open
    • Is something wrong?

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

    tamnd/firepanda#341 ·

    Maintainers usually reply within 1 day

  • inplace and ignore_index, decided once for the whole surface
    Open
    • Is something wrong?

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

    tamnd/firepanda#340 ·

    Maintainers usually reply within 1 day

  • The six transformation arguments that need something the core does not have
    Open
    • Is something wrong?

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

    tamnd/firepanda#339 ·

    Maintainers usually reply within 1 day

  • skipna=False and numeric_only on the cumulative scans
    Open
    • Is something wrong?

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

    tamnd/firepanda#338 ·

    Maintainers usually reply within 1 day

  • A frame transformation over axis=1
    Open
    • Is something wrong?

    Difficulty 5/5 Over a week Newbie friendliness 45/100

    tamnd/firepanda#337 ·

    Maintainers usually reply within 1 day

  • The transformation family, which is the same door problem as the reductions
    Open
    • Is something wrong?

    Difficulty 5/5 Over a week Newbie friendliness 45/100

    tamnd/firepanda#334 · 3 comments ·

    Maintainers usually reply within 1 day

  • The five reductions pandas has and AggKind does not
    Open
    • Is something wrong?

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

    tamnd/firepanda#333 ·

    Maintainers usually reply within 1 day

  • The reduction arguments that are declared and refused
    Open
    • Is something wrong?

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

    tamnd/firepanda#332 ·

    Maintainers usually reply within 1 day

  • Series.corr and Series.cov need a second column and index alignment
    Open
    • Is something wrong?

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

    tamnd/firepanda#331 ·

    Maintainers usually reply within 1 day

  • Five keyword arguments the Python binding does not take
    Open
    • Is something wrong?

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

    tamnd/firepanda#329 ·

    Maintainers usually reply within 1 day

  • S8. Memory, spilling and ADBC
    Open
    • Is something wrong?
    area/arrow area/sql area/streaming performance

    Difficulty 5/5 Over a week Newbie friendliness 18/100

    tamnd/firepanda#313 ·

    Maintainers usually reply within 1 day

  • S7. The front doors
    Open
    • Is something wrong?
    area/python area/sql enhancement security

    Difficulty 5/5 Over a week Newbie friendliness 18/100

    tamnd/firepanda#312 ·

    Maintainers usually reply within 1 day

  • S6. The optimizer
    Open
    • Is something wrong?
    area/plan area/sql performance

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

    tamnd/firepanda#311 ·

    Maintainers usually reply within 1 day

  • S5. The full SELECT surface, and the first conformance number
    Open
    • Is something wrong?
    area/exec area/plan area/sql enhancement test

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

    tamnd/firepanda#310 ·

    Maintainers usually reply within 1 day

  • S4. The logical plan and the first executions
    Open
    • Is something wrong?
    area/exec area/plan area/sql enhancement

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

    tamnd/firepanda#309 · 84 comments ·

    Maintainers usually reply within 1 day

  • S3. The binder, the catalog, the types and the tier one functions
    Open
    • Is something wrong?
    area/dtype area/sql enhancement test

    Difficulty 5/5 Over a week Newbie friendliness 18/100

    tamnd/firepanda#308 · 5 comments ·

    Maintainers usually reply within 1 day

  • S2. The AST, the transformer and the refusal table
    Open
    • Is something wrong?
    area/sql enhancement

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

    tamnd/firepanda#307 · 6 comments ·

    Maintainers usually reply within 1 day

  • S1. The tokenizer and the PEG matcher
    Open
    • Is something wrong?
    area/sql enhancement performance test

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

    tamnd/firepanda#306 ·

    Maintainers usually reply within 1 day

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