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fix(binder): multiple unions should retain the same cte_to_relation context #9007

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merged 3 commits into from
Apr 5, 2023
Merged

fix(binder): multiple unions should retain the same cte_to_relation context #9007

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205be55
fix(binder): multiple unions should retain the same cte_to_relation c…
lmatz Apr 5, 2023
53251dd
add e2e test
lmatz Apr 5, 2023
7a7687e
Merge branch 'main' into lz/fix_set_binder
lmatz Apr 5, 2023
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7 changes: 7 additions & 0 deletions e2e_test/batch/basic/cte.slt.part
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,13 @@ with c as (values(1)) select * from (with c as (values(2)) select * from c) foo
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query I rowsort
with table1 as ( select 1 as n), table2 as ( select 2 as n), table3 as ( select 3 as n) select * from table1 union select * from table2 union select * from table3;
----
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statement ok
drop table t1;

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3 changes: 2 additions & 1 deletion src/frontend/src/binder/set_expr.rs
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Expand Up @@ -127,7 +127,7 @@ impl Binder {
let left = Box::new(self.bind_set_expr(*left)?);
// Reset context for right side, but keep `cte_to_relation`.
let new_context = std::mem::take(&mut self.context);
self.context.cte_to_relation = new_context.cte_to_relation;
self.context.cte_to_relation = new_context.cte_to_relation.clone();
let right = Box::new(self.bind_set_expr(*right)?);

if left.schema().fields.len() != right.schema().fields.len() {
Expand Down Expand Up @@ -160,6 +160,7 @@ impl Binder {
// select a from t2 union all select b from t2 order by a+1; should throw an
// error.
self.context = BindContext::default();
self.context.cte_to_relation = new_context.cte_to_relation;
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since CTE can only be defined at the top level, I suppose I can just retain the cte_to_relation without concern?

Ok(BoundSetExpr::SetOperation {
op: BoundSetOperation::Union,
all,
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