#469 Support Complex type -- part 1 #471
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Partial fix for #469.
Server since v12.0.2 will send complex types (ARRAY, ROW, MAP, SET) OIDs to the client, which can be retrieved by the ' type_code' of
Cursor.description.Cursor.descriptionis a list of Column objects, there is a new Column.child_columns that returns a list of child Column objects for nested complex types (e.g. ARRAY[ARRAY[INT]], ROW(NUMERIC, ARRAY[VARCHAR])). This type hierarchy will be used to parse complex types data.