xudong963 commented on a change in pull request #1067:
URL: https://github.com/apache/arrow-datafusion/pull/1067#discussion_r724698342
##########
File path: datafusion/src/sql/planner.rs
##########
@@ -528,21 +528,43 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
name
))),
}?,
- columns_alias,
+ alias,
)
}
TableFactor::Derived {
subquery, alias, ..
- } => (
- self.query_to_plan_with_alias(
+ } => {
+ // if alias is None, return Err
+ if alias.is_none() {
+ return Err(DataFusionError::Plan(
+ "subquery in FROM must have an alias".to_string(),
+ ));
+ }
+ let logical_plan = self.query_to_plan_with_alias(
subquery,
alias.as_ref().map(|a| a.name.value.to_string()),
ctes,
- )?,
- alias.clone().map(|x| x.columns),
- ),
+ )?;
+ let schema = logical_plan.schema();
+ let mut df_fields_with_alias = Vec::new();
+ for df_field in schema.fields().iter() {
+ let df_field_with_alias = DFField::from_qualified(
+ &alias.as_ref().unwrap().name.value,
+ df_field.field().clone(),
+ );
+ df_fields_with_alias.push(df_field_with_alias);
+ }
Review comment:
good sight!
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