feat: Support Nested for joining queries.

[hardy4yooz]

Support Nested for joining queries.

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2 out of 4 committers have signed the CLA.

:white_check_mark: hardy4yooz
:white_check_mark: oranmoshai
:x: Hardy
:x: cchamplin

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[Shegl]

Guys, this is actually somewhat should be merged. Nested queries is very popular.