Clean up at indexing to support multi-index.

[ueshin]

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[softagram-bot]

Softagram Impact Report for pull/1049 (head commit: b074422)

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[codecov-io]

Codecov Report

Merging #1049 into master will decrease coverage by 1.41%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##           master    #1049      +/-   ##
==========================================
- Coverage   95.12%   93.71%   -1.42%     
==========================================
  Files          34       34              
  Lines        6770     6777       +7     
==========================================
- Hits         6440     6351      -89     
- Misses        330      426      +96

Impacted Files	Coverage Δ
databricks/koalas/internal.py	96.42% <100%> (ø)	⬆️
databricks/koalas/indexing.py	94.89% <96.96%> (+0.5%)	⬆️
databricks/koalas/usage_logging/__init__.py	24.54% <0%> (-72.73%)	⬇️
databricks/koalas/usage_logging/usage_logger.py	50% <0%> (-50%)	⬇️
databricks/koalas/__init__.py	80.85% <0%> (-6.39%)	⬇️
databricks/conftest.py	94% <0%> (-4%)	⬇️

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