## Summary
<!--Explain briefly what goes wrong and explain why you believe this is a bug and not the intended behavior of SQLite (if it is not a crash).-->**No review yet**

## Minimized query

```sql
BEGIN IMMEDIATE TRANSACTION;
.limit
CREATE TABLE T1 (
  a INTEGER,
  b TEXT
);
CREATE TABLE T2 (
  a INTEGER,
  b TEXT
);
INSERT INTO T1 VALUES (1,'a'),(2,'b');
INSERT INTO T2 VALUES (1,'c'),(1,'d');
SELECT T1.b,
(
  SELECT GROUP_CONCAT(b,',')
  FROM T2
  WHERE T2.a=T1.a
) AS c
FROM T1;
ROLLBACK;
```

## Actual output

```sql
length 1000000000
          sql_length 1000000000
              column 2000
          expr_depth 1000
     compound_select 500
             vdbe_op 250000000
        function_arg 127
            attached 10
 like_pattern_length 50000
     variable_number 32766
       trigger_depth 1000
      worker_threads 0
a|c,d
b|
```

## Expectation

```sql
length 1000000000
          sql_length 1000000000
              column 2000
          expr_depth 1000
     compound_select 500
             vdbe_op 250000000
        function_arg 1000
            attached 10
 like_pattern_length 50000
     variable_number 32766
       trigger_depth 1000
      worker_threads 0
a|c,d
b|
```

## Flag

```

```