Fix bugs

[goodwanghan]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (81276ef) 100.00% compared to head (6e44fe5) 100.00%.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #508   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          128       128           
  Lines        12039     12064   +25     
=========================================
+ Hits         12039     12064   +25     

Files Changed	Coverage Δ
fugue/dataframe/pandas_dataframe.py	100.00% <100.00%> (ø)
fugue_dask/execution_engine.py	100.00% <100.00%> (ø)
fugue_spark/_utils/convert.py	100.00% <100.00%> (ø)
fugue_spark/execution_engine.py	100.00% <100.00%> (ø)
fugue_test/execution_suite.py	100.00% <100.00%> (ø)

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