AdamGS commented on code in PR #24258:
URL: https://github.com/apache/datafusion/pull/24258#discussion_r3915286140
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datafusion/optimizer/src/simplify_expressions/expr_simplifier.rs:
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@@ -2304,6 +2332,39 @@ fn inlist_except(mut l1: InList, l2: &InList) ->
Result<Expr> {
Ok(Expr::InList(l1))
}
+/// Set algebra on `IN` lists is only sound if nullable list items are not
+/// discarded. When the tested expression is nullable, preserve the NULL branch
+/// of an otherwise constant result explicitly.
+fn simplify_inlist_set_operation(
+ info: &SimplifyContext,
+ left: &InList,
+ right: &InList,
+ result: Expr,
+) -> Option<Expr> {
+ let list_items_are_non_nullable = left
+ .list
+ .iter()
+ .chain(&right.list)
+ .all(|item| matches!(info.nullable(item), Ok(false)));
+
+ if !list_items_are_non_nullable {
+ return None;
+ }
+
+ if !is_true(&result) && !is_false(&result) {
Review Comment:
nit - is this `!is_bool_lit(&result)`?
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