jonahgao commented on code in PR #7581:
URL: https://github.com/apache/arrow-datafusion/pull/7581#discussion_r1446062679
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datafusion/expr/src/logical_plan/plan.rs:
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@@ -112,6 +112,8 @@ pub enum LogicalPlan {
/// produces 0 or 1 row. This is used to implement SQL `SELECT`
/// that has no values in the `FROM` clause.
EmptyRelation(EmptyRelation),
+ /// A named temporary relation with a schema.
+ NamedRelation(NamedRelation),
Review Comment:
I am considering whether the `NamedRelation` and `RecursiveQuery` could be
implemented as two `TableSource`s, one being `CTESelfRefTable` and the other
being `CTERecursiveTable`, and then use
[TableScan](https://github.com/apache/arrow-datafusion/blob/f5ca078f964b2a19db41e85640b1461508d4b8a6/datafusion/expr/src/logical_plan/plan.rs#L110)
to read them.
Use `CTESelfRefTable` within the recursive term and `CTERecursiveTable` in
the outer query.
But this idea is in its early stages and may be wrong.
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