SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function groupConcat (children 2)
     ExpressionList (children 1)
      Identifier p_string
     ExpressionList (children 1)
      Literal \'.\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_groupConcat
   Set
