Also experiencing this on Python 3.5 and a MySQL table. POSTGRES logs:
```
postgres_1 | 2018-09-07 00:43:54.264 UTC [2047] ERROR: value too long for
type character varying(32)
postgres_1 | 2018-09-07 00:43:54.264 UTC [2047] STATEMENT: INSERT INTO
table_columns (created_on, changed_on, column_name, verbose_name, is_active,
type, groupby, count_distinct, sum, avg, max, min, filterable, description,
table_id, is_dttm, expression, python_date_format, database_expression,
created_by_fk, changed_by_fk) VALUES ('2018-09-07T00:43:54.264204'::timestamp,
'2018-09-07T00:43:54.264209'::timestamp, 'uuid', NULL, true, 'VARCHAR(255)
COLLATE UTF8_UNICODE_CI', true, false, false, false, false, false, true, NULL,
17, false, '', NULL, NULL, 1, 1) RETURNING table_columns.id
```
How did you modify the column? Mysql or the superset table?
[ Full content available at:
https://github.com/apache/incubator-superset/issues/4271 ]
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