pl-row-encode
A Polars plugin for row-level, type-preserving encode/decode.
encode(*cols) packs a set of columns into a single Binary column where each value is an
opaque, self-describing token: the polars-row encoding of
the row, prefixed with an embedded schema header. decode_series(...) reverses it back into a
Struct, recovering the original dtypes without needing any external schema.
DataFrame
-> encode(*cols)
-> opaque bytes
-> decode(...) # (row bytes -> Struct -> original typed columns)
-> DataFrame
The type information rides with the token and can be decoded on the spot at some later date.
Token layout
Each Binary value is:
[ u32 header_len (LE) ][ header bytes ][ row bytes ]
header is a bincode-serialized Vec<Field> (logical schema); row bytes is the
unordered polars-row encoding of that single row. Embedding the header per value makes
every token independently decodable.
Usage
import polars as pl
from pl_row_encode import encode, decode_series
df = pl.DataFrame({"id": [1, 2], "name": ["alice", "bob"]})
tokens = df.select(tok=encode("id", "name"))["tok"] # dtype: Binary
# ... hand `tokens` to a vendor, get them back ...
decoded = decode_series(tokens).struct.unnest() # back to id / name with dtypes
For the lazy engine, the output Struct dtype must be known up front, so pass a token's
header explicitly:
from pl_row_encode import decode
header = ... # the [u32 len][header] prefix of any token
lf.select(decode("tok", schema_header=header)).collect()
Development
make develop # build the Rust extension into the venv (uv run maturin develop)
make test # build + run pytest
make lint # ruff + ty
The first make develop compiles the full Polars Rust workspace and takes a few minutes;
subsequent builds are incremental and fast.
Notes / limitations
- Built on
polars-row, the same machinery Polars uses internally for sort/group-by row encoding — lossless for primitive, string, boolean, temporal, and nested types. decode_seriesinfers the schema from the first non-null token, so an all-null/empty Series needs the explicitdecode(schema_header=...)form.
1 maintainer
Metadata
1 maintainer
Release files for pl-row-encode 0.3.1
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