jackwener commented on code in PR #5963:
URL: https://github.com/apache/arrow-datafusion/pull/5963#discussion_r1164098426
##########
datafusion-examples/examples/rewrite_expr.rs:
##########
@@ -66,11 +75,61 @@ fn observe(plan: &LogicalPlan, rule: &dyn OptimizerRule) {
)
}
-struct MyRule {}
+/// An example analyzer rule that changes Int64 literals to UInt64
+struct MyAnalyzerRule {}
+
+impl AnalyzerRule for MyAnalyzerRule {
+ fn analyze(&self, plan: LogicalPlan, _config: &ConfigOptions) ->
Result<LogicalPlan> {
+ Self::analyze_internal(&plan)
+ }
+
+ fn name(&self) -> &str {
+ "my_analyzer_rule"
+ }
+}
+
+impl MyAnalyzerRule {
+ fn analyze_internal(plan: &LogicalPlan) -> Result<LogicalPlan> {
+ // optimize child plans first
+ let mut new_inputs = plan
+ .inputs()
+ .iter()
+ .map(|p| Self::analyze_internal(p))
+ .collect::<Result<Vec<_>>>()?;
Review Comment:
we can use `transform_up`
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