SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Literal \'parallel_hash\' (alias alg)
    Function count (alias cnt) (children 1)
     ExpressionList
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier l
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier r
     TableJoin (children 1)
      Function and (children 1)
       ExpressionList (children 2)
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier l.k
          Identifier r.k
        Function greater (children 1)
         ExpressionList (children 2)
          Identifier l.v
          Identifier r.v
