rust-data-processing 0.3.0

Schema-first ingestion (CSV, JSON, Parquet, Excel) into an in-memory DataSet, plus Polars-backed pipelines, SQL, profiling, validation, and map/reduce-style processing.
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{
  "fields": [
    { "name": "id", "data_type": "Int64" },
    { "name": "name", "data_type": "Utf8" }
  ]
}