SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function position (children 1)
     ExpressionList (children 3)
      Function concat (children 1)
       ExpressionList (children 2)
        Function NULLIF (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal UInt64_1
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal UInt64_3
      Literal \'ca\'
      Literal UInt64_2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier 03013_position_const_start_pos
 Identifier Null
