dirigent-block-parquet
The parquet block family: one codec, convert.arrow, trading parquet with the
three text spellings convert.std already trades between.
| From | To | What it does |
|---|---|---|
parquet |
json, ndjson, csv |
Each row becomes one record, every value in its JSON spelling. |
json, ndjson, csv |
parquet |
Each record becomes one row, under a schema inferred from the records. |
The record model is convert.std's: a sequence of flat records. What parquet adds is
types, and the codec is honest about them in both directions:
- Writing infers one type per column -- boolean, int64, float64, or string -- from the records. Integers and floats unify to a float column, because JSON calls both a number; any other mix is refused naming the column. A column every row leaves null is written as a nullable string column. A csv source carries no types, so csv to parquet writes string columns and nothing else.
- Reading gives every value its JSON spelling: timestamps, dates and times come back as ISO strings, decimals as strings, and a float that is NaN or infinite as null. A nested column, or one holding raw bytes, is refused naming it -- flattening is a reshape, and a reshape belongs to a jq step that knows what the flattening should mean.
A conversion is a storage-object operation, like storage.copy: it reads the object at
source and writes the one at target, and neither side is ever a value the step carries.
A run that means to look at the records reads them with storage.read.
The family ships separately because convert.std is deliberately on the standard library
and nothing else; this codec stands on pyarrow.
Nothing else in the workspace may depend on it.
1 maintainer
Metadata
1 maintainer
Release files for dirigent-block-parquet 0.23.1
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| dirigent_block_parquet-0.23.1.tar.gz | 6.6 kB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| dirigent_block_parquet-0.23.1-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 15.6 kB
Release files / dirigent_block_parquet-0.23.1.tar.gz
| Download URL | dirigent_block_parquet-0.23.1.tar.gz |
|---|---|
| Size | 6.6 kB |
| Tags | Source |
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| Download URL | dirigent_block_parquet-0.23.1-py3-none-any.whl |
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| Size | 9.0 kB |
| Tags | Python 3 |
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twine/7.0.0 CPython/3.13.14
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