lehug commented on issue #15316:
URL: https://github.com/apache/superset/issues/15316#issuecomment-869401216
```
2021-06-28 06:33:06,052:WARNING:superset.connectors.sqla.models:Query SELECT
DATE(page_visit_at) AS __timestamp,
count(DISTINCT session_id) AS `COUNT_DISTINCT(session_id)`
FROM `ray-tool-test`.user_behavior_record
WHERE page_visit_at >= '2021-06-08 00:00:00.000000'
AND page_visit_at < '2021-06-23 00:00:00.000000'
AND ((code_project = '中文'))
GROUP BY DATE(page_visit_at)
LIMIT 500 on schema ray-tool-test failed
Traceback (most recent call last):
File "/app/superset/connectors/sqla/models.py", line 1508, in query
df = self.database.get_df(sql, self.schema, mutator=assign_column_label)
File "/app/superset/models/core.py", line 411, in get_df
self.db_engine_spec.execute(cursor, sqls[-1])
File "/app/superset/db_engine_specs/base.py", line 1085, in execute
raise cls.get_dbapi_mapped_exception(ex)
File "/app/superset/db_engine_specs/base.py", line 1083, in execute
cursor.execute(query)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/cursors.py", line
188, in execute
query = query.encode(db.encoding)
File "/usr/local/lib/python3.7/encodings/cp1252.py", line 12, in encode
return codecs.charmap_encode(input,errors,encoding_table)
UnicodeEncodeError: 'charmap' codec can't encode characters in position
278-279: character maps to <undefined>
```
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