Add support of parsing map literal and query parameter

[git-hulk]

This closes #92

[coveralls]

Pull Request Test Coverage Report for Build 10556180352

Details

• 102 of 147 (69.39%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 59.29%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
parser/parser_table.go	4	6	66.67%
parser/ast_visitor.go	6	10	60.0%
parser/ast.go	41	55	74.55%
parser/parser_column.go	51	76	67.11%

Totals
Change from base Build 10522129953:	0.1%
Covered Lines:	6130
Relevant Lines:	10339

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💛 - Coveralls

[jsommr]

Not only did you resolve my issue (had not expected that) but wow - you did it within 24 hours. Really impressive! And super grateful for your work.