InsertQuery   (children 2)
 Identifier lc_nullable
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 15)
     Identifier n (alias order_key)
     Identifier n (alias i8)
     Identifier n (alias i16)
     Identifier n (alias i32)
     Identifier n (alias i64)
     Identifier n (alias u8)
     Identifier n (alias u16)
     Identifier n (alias u32)
     Identifier n (alias u64)
     Identifier n (alias f32)
     Identifier n (alias f64)
     Identifier n (alias date)
     Identifier n (alias date_time)
     Identifier n (alias str)
     Identifier n (alias fixed_string)
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal Array_[NULL] (alias n)