tp: let semantic analysis see CTEs

[LalitMaganti]

Semantic analysis skipped the definitions of a WITH clause, so a query reading a CTE could not be described, and a pipeline could not read SQL which uses one:

FROM (
  WITH nodes AS (SELECT id, parent_id, self FROM tree)
  SELECT * FROM nodes
)
|> TREE ACCUMULATE UP SUM(self) AS total

Now each CTE is in scope for the rest of its WITH clause and the query it belongs to, hiding any relation of the same name there, as in SQLite:

• a CTE's list of column names renames its columns, as a view's does;
• a view still sees only what its names meant where it was defined;
• a recursive CTE reads itself as a relation of unknown shape.

What is analyzed is also read where it is in its statement: AnalyzeQuery(query) and AnalyzeRelation(at, name) see the CTEs in scope at that node. The analyzer finds them by following its own walk down to the node (statements, WITH clauses, compound selects, FROM clauses and pipeline sources), defining only the CTEs it passes. So once pipelines can be subqueries, the SQL they read can name a CTE of the statement they are written in:

WITH t AS (SELECT id, parent_id, self FROM tree)
SELECT * FROM (FROM t |> TREE ACCUMULATE UP SUM(self) AS total)

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