findepi commented on code in PR #12896:
URL: https://github.com/apache/datafusion/pull/12896#discussion_r1802046994


##########
datafusion/sql/tests/cases/plan_to_sql.rs:
##########
@@ -667,12 +667,95 @@ where
 }
 
 #[test]
-fn test_table_scan_pushdown() -> Result<()> {
+fn test_table_scan_alias() -> Result<()> {
     let schema = Schema::new(vec![
         Field::new("id", DataType::Utf8, false),
         Field::new("age", DataType::Utf8, false),
     ]);
 
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1) AS a"
+    );
+
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1) AS a"
+    );
+
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .filter(col("id").gt(lit(5)))?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+    println!("{}", plan.display_indent());

Review Comment:
   left over?



##########
datafusion/sql/tests/cases/plan_to_sql.rs:
##########
@@ -667,12 +667,95 @@ where
 }
 
 #[test]
-fn test_table_scan_pushdown() -> Result<()> {
+fn test_table_scan_alias() -> Result<()> {
     let schema = Schema::new(vec![
         Field::new("id", DataType::Utf8, false),
         Field::new("age", DataType::Utf8, false),
     ]);
 
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1) AS a"
+    );
+
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1) AS a"
+    );
+
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .filter(col("id").gt(lit(5)))?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+    println!("{}", plan.display_indent());
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1 WHERE (t1.id > 5)) AS a"
+    );
+
+    let table_scan_with_two_filter = table_scan_with_filters(
+        Some("t1"),
+        &schema,
+        None,
+        vec![col("id").gt(lit(1)), col("age").lt(lit(2))],
+    )?
+    .project(vec![col("id")])?
+    .alias("a")?
+    .build()?;
+    let table_scan_with_two_filter = plan_to_sql(&table_scan_with_two_filter)?;
+    assert_eq!(
+        format!("{}", table_scan_with_two_filter),

Review Comment:
   nit: `format!` is unnecessary, just use table_scan_with_two_filter (or 
table_scan_with_two_filter.to_string()) in assert
   
   (same in other places)



##########
datafusion/sql/tests/cases/plan_to_sql.rs:
##########
@@ -667,12 +667,95 @@ where
 }
 
 #[test]
-fn test_table_scan_pushdown() -> Result<()> {
+fn test_table_scan_alias() -> Result<()> {
     let schema = Schema::new(vec![
         Field::new("id", DataType::Utf8, false),
         Field::new("age", DataType::Utf8, false),
     ]);
 
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1) AS a"
+    );
+
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1) AS a"
+    );
+
+    let plan = table_scan(Some("t1"), &schema, None)?
+        .filter(col("id").gt(lit(5)))?
+        .project(vec![col("id")])?
+        .alias("a")?
+        .build()?;
+    println!("{}", plan.display_indent());
+    let sql = plan_to_sql(&plan)?;
+    assert_eq!(
+        format!("{}", sql),
+        "SELECT * FROM (SELECT t1.id FROM t1 WHERE (t1.id > 5)) AS a"
+    );
+
+    let table_scan_with_two_filter = table_scan_with_filters(
+        Some("t1"),
+        &schema,
+        None,
+        vec![col("id").gt(lit(1)), col("age").lt(lit(2))],
+    )?
+    .project(vec![col("id")])?
+    .alias("a")?
+    .build()?;

Review Comment:
   should this be indented? 



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