peter-toth commented on code in PR #11265:
URL: https://github.com/apache/datafusion/pull/11265#discussion_r1667004909
##########
datafusion/optimizer/src/common_subexpr_eliminate.rs:
##########
@@ -1838,4 +1851,53 @@ mod test {
Ok(())
}
+
+ #[test]
+ fn test_volatile() -> Result<()> {
+ let table_scan = test_table_scan()?;
+
+ let extracted_child = col("a") + col("b");
+ let rand =
Expr::ScalarFunction(ScalarFunction::new_udf(math::random(), vec![]));
+ let not_extracted_volatile = extracted_child + rand;
+ let plan = LogicalPlanBuilder::from(table_scan.clone())
+ .project(vec![
+ not_extracted_volatile.clone().alias("c1"),
+ not_extracted_volatile.alias("c2"),
+ ])?
+ .build()?;
+
+ let expected = "Projection: __common_expr_1 + random() AS c1,
__common_expr_1 + random() 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_volatile_short_circuits() -> Result<()> {
+ let table_scan = test_table_scan()?;
+
+ let rand =
Expr::ScalarFunction(ScalarFunction::new_udf(math::random(), vec![]));
+ let not_extracted_volatile_short_circuit_2 =
+ rand.clone().eq(lit(0)).or(col("b").eq(lit(0)));
+ let not_extracted_volatile_short_circuit_1 =
+ col("a").eq(lit(0)).or(rand.eq(lit(0)));
+ let plan = LogicalPlanBuilder::from(table_scan.clone())
+ .project(vec![
+ not_extracted_volatile_short_circuit_1.clone().alias("c1"),
+ not_extracted_volatile_short_circuit_1.alias("c2"),
Review Comment:
This question is similar to
https://github.com/apache/datafusion/pull/11197#discussion_r1662618797. We can
extract the surely evaluated expressions (1st legs) from those short circuiting
`Or`, `And` and `CaseWhen` expressions, but we are not there yet with this PR.
My 3rd PR in the https://github.com/apache/datafusion/issues/11194 epic will
implement that logic, but I want to add the improvements gradually.
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