Rewrite time interval tests #340
Description
Pg time interval tests are using the keyword ago. Rewrite them without it.
- test_text_columns_are_limitless_the_upper_limit_is_one_GB
- test_data_type_of_oid_types
- test_update_oid
- test_data_type_of_time_types
- test_oid_values
- test_time_values
- test_update_large_time_in_seconds