SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function uniqExact (children 1)
     ExpressionList (children 1)
      Identifier u
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_sparse_full
   Function notEquals (children 1)
    ExpressionList (children 2)
     Identifier s
     Literal \'\'