peter-toth commented on code in PR #11683:
URL: https://github.com/apache/datafusion/pull/11683#discussion_r1693953710
##########
datafusion/optimizer/src/common_subexpr_eliminate.rs:
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@@ -1963,6 +1944,52 @@ mod test {
Ok(())
}
+ #[test]
+ fn test_non_top_level_common_expression() -> Result<()> {
+ let table_scan = test_table_scan()?;
+
+ let common_expr = col("a") + col("b");
+ let plan = LogicalPlanBuilder::from(table_scan)
+ .project(vec![
+ common_expr.clone().alias("c1"),
+ common_expr.alias("c2"),
+ ])?
+ .project(vec![col("c1"), col("c2")])?
+ .build()?;
+
+ let expected = "Projection: c1, c2\
+ \n Projection: __common_expr_1 AS c1, __common_expr_1 AS c2\
+ \n Projection: test.a + test.b AS __common_expr_1, test.a, test.b,
test.c\
+ \n TableScan: test";
+
+ assert_optimized_plan_eq(expected, plan, None);
+
+ Ok(())
+ }
+
+ #[test]
+ fn test_nested_common_expression() -> Result<()> {
Review Comment:
New test for the top-down improvement (2.).
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