function toDialectString(IDialect $dialect) { $compiledSlices = array(); $compiledSlices[] = '('; $compiledSlices[] = $this->subject->toDialectString($dialect); $compiledSlices[] = ')'; $compiledSlices[] = $this->operator->toDialectString($dialect); $compiledString = join(' ', $compiledSlices); return $compiledString; }