ColumnDataType
ColumnDataType: DataType | DataTypeClass
Categories: projection, string
The data type a ColumnDefinition gives a captured column.
Either a data type from tabsdatak.tableframe.datatypes used as a type
(Int64) or an instance of one where the type is parameterized
(Datetime("us")).
Examples
ColumnDefinition("year", Int64)
ColumnDefinition("seen_at", Datetime("us"))