Partial Implementation of aliasing functionality. #1930
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TODO: fix error in modules/relexp.js: the types attribute inside the function convertExpr() retains a list of the pre-aliased tables and column names. If a column in the format of alias.coulmn_name is projected to, the application would throw an error along the lines of "Table alias not found", since the types variable that contains the pre-aliased table names would get referenced (See relexp.js: 204).