Module arrow2::io::parquet::read::schema

APIs to handle Parquet <-> Arrow schemas.

Structs

• FileMetaData
  Metadata for a Parquet file.
• KeyValue
  Wrapper struct to store key values
• SchemaDescriptor
  A schema descriptor. This encapsulates the top-level schemas for all the columns, as well as all descriptors for all the primitive columns.

Enums

• ParquetType
  Representation of a Parquet type describing primitive and nested fields, including the top-level schema of the parquet file.

Functions

• infer_schema
  Infers a Schema 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.
• parquet_to_arrow_schema
  Converts ParquetTypes to a Field, ignoring parquet fields that do not contain any physical column.
• read_schema_from_metadata
  Reads an arrow schema from Parquet’s file metadata. Returns None if no schema was found.