LucaCappelletti94 commented on code in PR #2621:
URL:
https://github.com/apache/datafusion-sqlparser-rs/pull/2621#discussion_r4250649474
##########
src/parser/mod.rs:
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@@ -15326,6 +15326,11 @@ impl<'a> Parser<'a> {
mut expr: SetExpr,
precedence: u8,
) -> Result<Box<SetExpr>, ParserError> {
+ // A flat chain of set operations parses iteratively, but each folded
+ // operator still nests the AST one level deeper. Reserve one level of
+ // recursion budget per fold so downstream recursive consumers (derived
+ // `Clone`, visitors, planners) are bounded exactly as for nesting.
+ let mut fold_guards = Vec::new();
Review Comment:
You should remove `fold_guards` and its comment along with the guard.
```suggestion
```
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