Lordworms commented on issue #14958:
URL: https://github.com/apache/datafusion/issues/14958#issuecomment-2777223899
Like what duckdb did
## 1. Detect Correlated Columns
- Walk subquery expressions and collect all outer (correlated) column
references.
- Represent them as `Expr::OuterReference(Column)` to preserve through
planning.
## 2. Implement LogicalPlan for Delim Join
- Add a new `LogicalPlan::DelimJoin` node (or extend `Join`) with:
- `left`, `right`, `correlated_columns`, `join_type`
- This plan node records the correlation without rewriting or flattening the
subquery.
- Acts as a placeholder that defers correlation handling to execution.
## 3. Implement PhysicalPlan for Delim Join
- Add `DelimJoinExec`, a new `ExecutionPlan` that:
- For each row in `left`, extracts correlated column values
- Binds them as parameters and executes `right` subplan with substituted
values
- Joins results per the requested join type (e.g., INNER, LEFT)
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