liukun4515 commented on code in PR #3636:
URL: https://github.com/apache/arrow-datafusion/pull/3636#discussion_r981993529
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datafusion/optimizer/src/type_coercion.rs:
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@@ -50,56 +50,63 @@ impl OptimizerRule for TypeCoercion {
plan: &LogicalPlan,
optimizer_config: &mut OptimizerConfig,
) -> Result<LogicalPlan> {
- // optimize child plans first
- let new_inputs = plan
- .inputs()
- .iter()
- .map(|p| self.optimize(p, optimizer_config))
- .collect::<Result<Vec<_>>>()?;
-
- // get schema representing all available input fields. This is used
for data type
- // resolution only, so order does not matter here
- let schema = new_inputs.iter().map(|input| input.schema()).fold(
- DFSchema::empty(),
- |mut lhs, rhs| {
- lhs.merge(rhs);
- lhs
- },
- );
+ optimize_internal(plan, optimizer_config)
+ }
+}
- let mut expr_rewrite = TypeCoercionRewriter {
- schema: Arc::new(schema),
- };
+fn optimize_internal(
Review Comment:
just refactor the optimize and extract the function
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