alamb commented on code in PR #3717:
URL: https://github.com/apache/arrow-datafusion/pull/3717#discussion_r988368205
##########
datafusion/sql/src/planner.rs:
##########
@@ -5046,6 +5058,67 @@ mod tests {
quick_test(sql, expected)
}
+ #[test]
+ fn cte_with_no_column_names() {
+ let sql = "WITH \
+ numbers AS ( \
+ SELECT 1 as a, 2 as b, 3 as c \
+ ) \
+ SELECT * FROM numbers;";
+
+ let expected = "Projection: numbers.a, numbers.b, numbers.c\
+ \n Projection: Int64(1) AS a, Int64(2) AS b, Int64(3) AS c,
alias=numbers\
+ \n EmptyRelation";
+
+ quick_test(sql, expected)
+ }
+
+ #[test]
+ fn cte_with_column_names() {
+ let sql = "WITH \
+ numbers(a, b, c) AS ( \
+ SELECT 1, 2, 3 \
+ ) \
+ SELECT * FROM numbers;";
+
+ let expected = "Projection: numbers.a, numbers.b, numbers.c\
+ \n Projection: numbers.Int64(1) AS a, numbers.Int64(2) AS b,
numbers.Int64(3) AS c, alias=numbers\
+ \n Projection: Int64(1), Int64(2), Int64(3), alias=numbers\
+ \n EmptyRelation";
+
+ quick_test(sql, expected)
+ }
+
+ #[test]
+ fn cte_with_column_aliases_precedence() {
+ // The end result should always be what CTE specification says
+ let sql = "WITH \
+ numbers(a, b, c) AS ( \
+ SELECT 1 as x, 2 as y, 3 as z \
+ ) \
+ SELECT * FROM numbers;";
+
+ let expected = "Projection: numbers.a, numbers.b, numbers.c\
Review Comment:
👍
##########
datafusion/sql/src/planner.rs:
##########
@@ -785,33 +790,40 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
}
};
if let Some(alias) = alias {
- let columns_alias = alias.clone().columns;
- if columns_alias.is_empty() {
- // sqlparser-rs encodes AS t as an empty list of column alias
- Ok(plan)
- } else if columns_alias.len() != plan.schema().fields().len() {
- Err(DataFusionError::Plan(format!(
- "Source table contains {} columns but only {} names given
as column alias",
- plan.schema().fields().len(),
- columns_alias.len(),
- )))
- } else {
- Ok(LogicalPlanBuilder::from(plan.clone())
- .project_with_alias(
-
plan.schema().fields().iter().zip(columns_alias.iter()).map(
- |(field, ident)| {
-
col(field.name()).alias(&normalize_ident(ident))
- },
- ),
- Some(normalize_ident(&alias.name)),
- )?
- .build()?)
- }
+ self.apply_table_alias(plan, alias)
} else {
Ok(plan)
}
}
+ /// Apply the given TableAlias to the top-level projection.
+ fn apply_table_alias(
Review Comment:
👌
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