Class ColumnSchema (3.14.0)

ColumnSchema(mapping=None, *, ignore_unknown_fields=False, **kwargs)

A column within a schema. Columns can be nested inside other columns.

.. _oneof:


column str
Required. Name of the column. Must be a UTF-8 string without dots (.). The maximum size is 64 bytes.
type_ str
Required. Type of the column. Must be a UTF-8 string with the maximum size of 128 bytes.
description str
Optional. Description of the column. Default value is an empty string. The description must be a UTF-8 string with the maximum size of 2000 bytes.
mode str
Optional. A column's mode indicates whether values in this column are required, nullable, or repeated. Only NULLABLE, REQUIRED, and REPEATED values are supported. Default mode is NULLABLE.
default_value str
Optional. Default value for the column.
ordinal_position int
Optional. Ordinal position
Optional. Most important inclusion of this column.
subcolumns MutableSequence[]
Optional. Schema of sub-columns. A column can have zero or more sub-columns.
Looker specific column info of this column. This field is a member of oneof_ system_spec.
gc_rule str
Optional. Garbage collection policy for the column or column family. Applies to systems like Cloud Bigtable.




Specifies inclusion of the column in an index

Values: INDEXING_TYPE_UNSPECIFIED (0): Unspecified. INDEXING_TYPE_NONE (1): Column not a part of an index. INDEXING_TYPE_NON_UNIQUE (2): Column Part of non unique index. INDEXING_TYPE_UNIQUE (3): Column part of unique index. INDEXING_TYPE_PRIMARY_KEY (4): Column part of the primary key.


LookerColumnSpec(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Column info specific to Looker System.