Represents the type of the columns property.
It is an object that maps the known column names to a list of values.
If no data schema is given, it maps string to a list of values.
Type Parameters
TextendsDataSchema
Type of the data schema.
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Represents the type of the
columnsproperty. It is an object that maps the known column names to a list of values. If no data schema is given, it maps string to a list of values.