Version 0.6.0 Panic error during SQL execution

Describe the bug
Panic error occurs when executing Join SQL. Refer to the attached jupyter execution result.

Exception: Arrow error: External error: Arrow error: External error: Execution error: Join Error: task 57 panicked
thread 'tokio-runtime-worker' panicked at 'range end index 83 out of range for slice of length 72'.

Additional context
In version 0.5.2, No problem with the same SQL.

Additional Information

Column (company) value is UTF-8 Japanese string.
In company value is alpha-numeric string, there is no problem with the same SQL.

Solved!

After modifying the SQL as below, it was OK. Help. Do you know why this modified SQL is OK?
Before　 GROUP BY company
After　　 GROUP BY company, stock_code

sql = '''
SELECT mas.company, SUM(CAST(trading_volume AS INTEGER)/10000000) AS sum_trading_volume FROM ( 
  SELECT stock_code, company FROM stock_master) AS mas 
    INNER JOIN stock_trading_info 
    USING (stock_code) 
  GROUP BY company, stock_code
  ORDER BY sum_trading_volume DESC 
  LIMIT 10
  '''
df = ctx.sql(sql)

[comphead]

@ike560 it is valid sql. You can group by company, stock_code but still have only company in select. That doesn't make much sense, but it is still valid