alamb commented on code in PR #11197:
URL: https://github.com/apache/datafusion/pull/11197#discussion_r1662520975
##########
datafusion/optimizer/src/common_subexpr_eliminate.rs:
##########
@@ -1012,19 +1013,22 @@ impl TreeNodeRewriter for CommonSubexprRewriter<'_, '_>
{
self.alias_counter += 1;
}
- // The `CommonSubexprRewriter` relies on `ExprIdentifierVisitor` to
generate
- // the `id_array`, which records the expr's identifier used to rewrite
expr. So if we
+ // The `CommonSubexprRewriter` relies on `ExprIdentifierVisitor` to
generate the
+ // `id_array`, which records the expr's identifier used to rewrite
expr. So if we
// skip an expr in `ExprIdentifierVisitor`, we should skip it here,
too.
- if expr.short_circuits() {
- return Ok(Transformed::new(expr, false, TreeNodeRecursion::Jump));
- }
+ let is_tree = expr.short_circuits();
+ let tnr = if is_tree {
+ TreeNodeRecursion::Jump
Review Comment:
I don't understand the meaning of `is_tree` here.
Maybe we could add a comment explaining that `Jump` will skip children but
continue with siblings
##########
datafusion/optimizer/src/common_subexpr_eliminate.rs:
##########
@@ -1799,4 +1803,34 @@ mod test {
assert!(result.len() == 1);
Ok(())
}
+
+ #[test]
+ fn test_short_circuits() -> Result<()> {
+ let table_scan = test_table_scan()?;
+
+ let extracted_short_circuit =
col("a").eq(lit(0)).or(col("b").eq(lit(0)));
+ let not_extracted_short_circuit_leg = (col("a") + col("b")).eq(lit(0));
+ let plan = LogicalPlanBuilder::from(table_scan.clone())
Review Comment:
I think this test covers the negative case too.
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