TOTALS and BY combinators

[perst20]

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Add support for TOTALS and BY combinators for aggregate functions. They allow to compute aggregations with rollups without using window functions or grouping sets.

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[clickhouse-ci[bot]]

This is an automatic comment. The PR descriptions does not match the template.

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The error is: Changelog entry required for category 'New Feature'

[perst20]

Not working yet

[robot-clickhouse-ci-1]

This is an automated comment for commit a5da17b8f920174489258a60f00c13a3dccf3888 with description of existing statuses. It's updated for the latest CI running

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[perst20]

There are a couple of flaws here that I'm going to fix soon:

• Extra space before TOTALS and BY when using EXPLAIN SYNTAX
• Incorrect column names in the query result

Otherwise it's ready for review

[perst20]

Ready for review