fix concat_op

Signed-off-by: Runji Wang <[email protected]>
risingwavelabs · Sep 8, 2023 · db92f82 · db92f82
1 parent c2de14a
commit db92f82
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/frontend/src/expr/type_inference/func.rs b/src/frontend/src/expr/type_inference/func.rs
@@ -334,6 +334,14 @@ fn infer_type_for_special(
                 .try_collect()?;
             Ok(Some(DataType::Varchar))
         }
+        ExprType::ConcatOp => {
+            let inputs_owned = std::mem::take(inputs);
+            *inputs = inputs_owned
+                .into_iter()
+                .map(|input| input.cast_explicit(DataType::Varchar))
+                .try_collect()?;
+            Ok(Some(DataType::Varchar))
+        }
         ExprType::Format => {
             ensure_arity!("format", 1 <= | inputs |);
             let inputs_owned = std::mem::take(inputs);