QQueryBuilder::AddJoinCustomSqlItem PHP Method

    public function AddJoinCustomSqlItem($strSql)
    {
        $this->strJoinArray[$strSql] = $strSql;
    }

 public function UpdateQueryBuilder(QQueryBuilder $objBuilder)
 {
     $strJoinSql = sprintf('LEFT JOIN %s%s%s AS %s%s%s ON %s', $objBuilder->EscapeIdentifierBegin, $this->strTableName, $objBuilder->EscapeIdentifierEnd, $objBuilder->EscapeIdentifierBegin, $this->strTableAlias, $objBuilder->EscapeIdentifierEnd, $this->strJoinConditionSql);
     $objBuilder->AddJoinCustomSqlItem($strJoinSql);
 }