Module datatypes 

Lance data types, Schema and Field

Structs

Dictionary

Field

Lance Schema Field

LogicalType

LogicalType is a string presentation of arrow type. to be serialized into protobuf.

Projection

A projection is a selection of fields in a schema

Schema

Lance Schema.

SchemaCompareOptions

Enums

BlobHandling

Specifies how to handle blob columns when projecting

BlobKind

Physical storage mode for blob v2 descriptors (one byte, stored in the packed struct column).

BlobVersion

Blob column format version.

Encoding

Encoding enum.

FieldRef

Reference to a field in a schema, either by ID or by path.

NullabilityComparison

OnMissing

What to do when a column is missing in the schema

OnTypeMismatch

What to do on a merge operation if the types of the fields don’t match

Constants

BLOB_LOGICAL_TYPE

LANCE_UNENFORCED_PRIMARY_KEY_POSITION

Use this config key in Arrow field metadata to specify the position of a primary key column. The value is a 1-based integer indicating the order within the composite primary key. When specified, primary key fields are ordered by this position value. When not specified, primary key fields are ordered by their schema field id.

Statics

BLOB_DESC_FIELD

BLOB_DESC_FIELDS

BLOB_DESC_LANCE_FIELD

BLOB_DESC_TYPE

BLOB_V2_DESC_FIELD

BLOB_V2_DESC_FIELDS

BLOB_V2_DESC_LANCE_FIELD

BLOB_V2_DESC_TYPE

Traits

Projectable

A trait for something that we can project fields from.

Functions

escape_field_path_for_project

Escape a field path for project

format_field_path

Format a field path, quoting field names that require escaping.

parse_field_path

Parse a field path that may contain quoted field names.