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The first iteration on WITH CTE support. Only simple CTEs are supported.
Properties:
1. Redefinition is forbidden.
2. Shadowing is supported.
3. Nested WITH CTEs are supported.
Following features are not yet implemented:
1. Column names specification. There is an assertion failure at core because
of an absent column order when translating it like for the `PgSelect`.
2. `RECURSIVE` is postponed. There a more sophisticated translation with
`YqlSelf` callable is required.
Also there was a potential defect because of an empty `Id` result not expected.
commit_hash:759676d8a9d369f7eedd9b87f79455b2f8a9fcff
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