mattsu2020 opened a new pull request, #25954: URL: https://github.com/apache/datafusion/pull/25954
## Which issue does this PR close? - Closes #10628. ## Rationale for this change Users need concrete examples of inspecting and rewriting `LogicalPlan` trees with the `TreeNode` APIs, including subqueries embedded in expressions. ## What changes are included in this PR? - Extend the `LogicalPlan` rustdoc example to collect table names with `TreeNode::apply`. - Add a tested `TreeNode::rewrite` example that removes Filter nodes, explaining traversal order and the change in query semantics. - Add the `query_planning -- plan_walk` example demonstrating plan inspection, stateful rewriting, subquery traversal, and collecting predicates from both Filter nodes and TableScan filters. - Register the example in the query planning runner and update the generated examples README. ## What is the testing strategy for this PR? The rustdoc examples and assertions in the executable example verify the collected table names, rewritten plan, subquery traversal, and filter predicates. - `cargo test --profile ci -p datafusion-expr --doc logical_plan::plan::LogicalPlan` (8 passed) - `cargo run --profile ci -p datafusion-examples --example query_planning -- plan_walk` - `cargo fmt --all` - `cargo clippy --all-targets --all-features -- -D warnings` - `./ci/scripts/doc_prettier_check.sh --write --allow-dirty` - `./dev/rust_lint.sh` (run via `uv run --package datafusion-dev --with PyYAML`) ## Are there any user-facing changes? The API documentation now includes additional plan walking and rewriting examples and links to an executable walkthrough. There are no changes to query execution or public APIs. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
