pub fn infer_schema(file_metadata: &FileMetadata) -> PolarsResult<ArrowSchema>Expand description
Infers a ArrowSchema from parquet’s FileMetadata.
This first looks for the metadata key "ARROW:schema"; if it does not exist, it converts the
Parquet types declared in the file’s Parquet schema to Arrow’s equivalent.
§Error
This function errors iff the key "ARROW:schema" exists but is not correctly encoded,
indicating that the file’s arrow metadata was incorrectly written.