src/Web2All/Table/MultiValueOperator.class.php
public function setOperator($operator)
  {
    $this->checkParams($this->operation,$operator);
    $this->operator=$operator;
  }
public function setOperator($operator)
  {
    $this->checkParams($this->operation,$operator);
    $this->operator=$operator;
  }
Set the operator that has to be used when this SQLOperation
is used in the WHERE part of a query.

@param string $operator  sql comparison operator (IN,BETWEEN)