googlerobot commented on issue #4271: Error inserting table_columns for SQL Server table due to too long "type" value URL: https://github.com/apache/incubator-superset/issues/4271#issuecomment-362172805 I have the same error under mysql with config `default-character-set = utf8mb4`, and I found the error reason is try to insert into table `table_columns` with type value `VARCHAR(255) COLLATE UTF8MB4_UNICODE_CI` , but type field seems max length is 32, I modify the column fixed this error.
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