Fix #50 executemany failed when insert a batch of data to a Hive table

[taogeYT]

[bkyryliuk]

please add unit tests as well

[codecov[bot]]

Codecov Report

Merging #331 (7cb9b8e) into master (ee86ab7) will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
+ Coverage   93.36%   93.44%   +0.07%     
==========================================
  Files          14       14              
  Lines        1553     1571      +18     
  Branches      167      169       +2     
==========================================
+ Hits         1450     1468      +18     
  Misses         75       75              
  Partials       28       28              

Impacted Files	Coverage Δ
pyhive/hive.py	87.96% <100.00%> (+0.56%)	:arrow_up:
pyhive/tests/test_hive.py	97.84% <100.00%> (+0.09%)	:arrow_up:

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