alamb commented on a change in pull request #2012:
URL: https://github.com/apache/arrow-datafusion/pull/2012#discussion_r832681202
##########
File path: datafusion-expr/src/expr.rs
##########
@@ -228,6 +228,8 @@ pub enum Expr {
},
/// Represents a reference to all fields in a schema.
Wildcard,
+ /// Represents a reference to all fields in a specific schema.
Review comment:
I personally have a slight preference for a single `Expr::Wildcard` with
optional qualifier
```rust
Wildcard { qualifier: Option<String>}
```
but that is a personal preference and there is nothing wrong with this
approach
##########
File path: datafusion/tests/sql/wildcard.rs
##########
@@ -0,0 +1,149 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+use super::*;
+
+#[tokio::test]
+async fn select_qualified_wildcard() -> Result<()> {
+ let mut ctx = SessionContext::new();
+ register_aggregate_simple_csv(&mut ctx).await?;
+
+ let sql = "SELECT agg.* FROM aggregate_simple as agg order by c1";
+ let results = execute_to_batches(&ctx, sql).await;
+
+ let expected = vec![
+ "+---------+----------------+-------+",
+ "| c1 | c2 | c3 |",
+ "+---------+----------------+-------+",
+ "| 0.00001 | 0.000000000001 | true |",
+ "| 0.00002 | 0.000000000002 | false |",
+ "| 0.00002 | 0.000000000002 | false |",
+ "| 0.00003 | 0.000000000003 | true |",
+ "| 0.00003 | 0.000000000003 | true |",
+ "| 0.00003 | 0.000000000003 | true |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "+---------+----------------+-------+",
+ ];
+
+ assert_batches_eq!(expected, &results);
+
+ Ok(())
+}
+
+#[tokio::test]
+async fn select_non_alias_qualified_wildcard() -> Result<()> {
+ let mut ctx = SessionContext::new();
+ register_aggregate_simple_csv(&mut ctx).await?;
+
+ let sql = "SELECT aggregate_simple.* FROM aggregate_simple order by c1";
+ let results = execute_to_batches(&ctx, sql).await;
+
+ let expected = vec![
+ "+---------+----------------+-------+",
+ "| c1 | c2 | c3 |",
+ "+---------+----------------+-------+",
+ "| 0.00001 | 0.000000000001 | true |",
+ "| 0.00002 | 0.000000000002 | false |",
+ "| 0.00002 | 0.000000000002 | false |",
+ "| 0.00003 | 0.000000000003 | true |",
+ "| 0.00003 | 0.000000000003 | true |",
+ "| 0.00003 | 0.000000000003 | true |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00004 | 0.000000000004 | false |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "| 0.00005 | 0.000000000005 | true |",
+ "+---------+----------------+-------+",
+ ];
+
+ assert_batches_eq!(expected, &results);
+
+ Ok(())
+}
+
+#[tokio::test]
+async fn select_qualified_wildcard_join() -> Result<()> {
+ let ctx = create_join_context("t1_id", "t2_id")?;
+ let sql =
+ "SELECT tb1.*, tb2.* FROM t1 tb1 JOIN t2 tb2 ON t2_id = t1_id ORDER BY
t1_id";
+ let expected = vec![
+ "+-------+---------+-------+---------+",
+ "| t1_id | t1_name | t2_id | t2_name |",
+ "+-------+---------+-------+---------+",
+ "| 11 | a | 11 | z |",
+ "| 22 | b | 22 | y |",
+ "| 44 | d | 44 | x |",
+ "+-------+---------+-------+---------+",
+ ];
+
+ let results = execute_to_batches(&ctx, sql).await;
+
+ assert_batches_eq!(expected, &results);
+
+ Ok(())
+}
+
+#[tokio::test]
+async fn select_non_alias_qualified_wildcard_join() -> Result<()> {
+ let ctx = create_join_context("t1_id", "t2_id")?;
+ let sql = "SELECT t1.*, tb2.* FROM t1 JOIN t2 tb2 ON t2_id = t1_id ORDER
BY t1_id";
+ let expected = vec![
+ "+-------+---------+-------+---------+",
+ "| t1_id | t1_name | t2_id | t2_name |",
+ "+-------+---------+-------+---------+",
+ "| 11 | a | 11 | z |",
+ "| 22 | b | 22 | y |",
+ "| 44 | d | 44 | x |",
+ "+-------+---------+-------+---------+",
+ ];
+
+ let results = execute_to_batches(&ctx, sql).await;
+
+ assert_batches_eq!(expected, &results);
+
+ Ok(())
+}
+
+#[tokio::test]
+async fn select_wrong_qualified_wildcard() -> Result<()> {
+ let mut ctx = SessionContext::new();
+ register_aggregate_simple_csv(&mut ctx).await?;
+
+ let sql = "SELECT agg.* FROM aggregate_simple order by c1";
+ let result = ctx.create_logical_plan(sql);
+ match result {
+ Ok(_) => panic!("unexpected OK"),
+ Err(err) => assert_eq!(
+ err.to_string(),
+ "Error during planning: Invalid qualifier agg"
Review comment:
👍
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