Add processing of nested group by clauses

[lunaticusgreen]

fix #742
fix #762
fix #739

[github-actions]

Pull Request Test Coverage Report for Build 14561088677

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 467 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-15.6%) to 55.824%

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Files with Coverage Reduction	New Missed Lines	%
pkg/main.go	5	0.0%
pkg/eval/eval_query.go	27	78.0%
pkg/query.go	54	0.0%
pkg/datasource.go	78	0.0%
pkg/client.go	83	0.0%
pkg/parser.go	87	0.0%
pkg/response.go	133	0.0%

Totals
Change from base Build 14477069531:	-15.6%
Covered Lines:	1433
Relevant Lines:	2567

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💛 - Coveralls