OptionalcolumnName of the source column whose target PostgreSQL type should be overridden.
OptionalpgPostgreSQL-specific target type to use for the column.
OptionalsizeSize parameter for the target type. Required when pg_type is PG_SPECIFIC_TYPE_VECTOR (specifies the vector dimension, e.g., 1024).
Overrides the default Delta-to-PostgreSQL type mapping for a single column.