Query: Avoid pushdown on top level during split query

[smitpatel]

Resolves #24745

[ghost]

Hello @smitpatel!

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[smitpatel]

@roji - for your eyes only!

[ghost]

Apologies, while this PR appears ready to be merged, I've been configured to only merge when all checks have explicitly passed. The following integrations have not reported any progress on their checks and are blocking auto-merge:

1. Azure Pipelines

These integrations are possibly never going to report a check, and unblocking auto-merge likely requires a human being to update my configuration to exempt these integrations from requiring a passing check.

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[roji]

Awesome 🎉

Is #17622 a dup?

[smitpatel]

#17622 is not a dupe. This is just about not pushing down top level when split query. #17622 requires to lift multiple tables from right side of join to top level on left. Some other day.