Added test case to illustrate query case sensitivity.
Added test to validate correct mapping of case sensitive columns:
Updated test case to further illustrate case sensitivty.
Merged master and updated test case with select to validate.
Merge remote-tracking branch 'phillip/casing_error' into casing_error
Added tag to provide hint when dealing with ambiguous column names
Merge pull request #3 from relops/casing_error

Eagerly down casing column names incorrectly overrides explicit column hint