AdamGS commented on code in PR #24258:
URL: https://github.com/apache/datafusion/pull/24258#discussion_r3915309468
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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(
Review Comment:
How hard is it to make this function return `Result<Option<Expr>>`?
discarding the error cases seems weird to me.
If its acceptable, might be worth documenting why.
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