gluesql / gluesql / 31076816134

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Evolve query plans into a typed execution pipeline (#1937)

Replace the AST-shaped query plan and SELECT execution path with a concrete, typed execution pipeline.
This completes the query pipeline conversion for SELECT and VALUES.

The intended SELECT execution order is:

```text
Source
  -> Join
  -> Filter
  -> Aggregate
  -> Project
  -> Order By
  -> Distinct
  -> Offset
  -> Limit
```

VALUES follows its own typed path:

```text
Values
  -> Order By
  -> Offset
  -> Limit
```

Each plan state accepts only its valid preceding states.
The query builder mirrors the same relationships at compile time,
and the executor evaluates the resulting nodes from the inner input outward.

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