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PARQUET-322 Document ENUM as a logical type. #54

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PARQUET-322 Document ENUM as a logical type. #54

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13 changes: 12 additions & 1 deletion LogicalTypes.md
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Expand Up @@ -32,13 +32,24 @@ This file contains the specification for all logical types.
The parquet format's `ConvertedType` stores the type annotation. The annotation
may require additional metadata fields, as well as rules for those fields.

### UTF8 (Strings)
## String Types

### UTF8

`UTF8` may only be used to annotate the binary primitive type and indicates
that the byte array should be interpreted as a UTF-8 encoded character string.

The sort order used for `UTF8` strings is `UNSIGNED` byte-wise comparison.

### ENUM

`ENUM` annotates the binary primitive type and indicates that the value
was converted from an enumerated type in another data model (e.g. Thrift, Avro, Protobuf).
Applications using a data model lacking a native enum type should interpret `ENUM`
annotated field as a UTF-8 encoded string.

The sort order used for `ENUM`s is `UNSIGNED` byte-wise comparison.

## Numeric Types

### Signed Integers
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