} else {
filter = new EqualityFilter(expr, this.equalityMap);
this.add(this.tripleConsumer, BuildOperatorGraphRuleVisitor.keyEquality, filter);
}
this.booleanIndex.addSucceedingOperator(filter);
filter.addPrecedingOperator(this.booleanIndex);
if(arg!=null){
filter.setSucceedingOperator((OperatorIDTuple) arg);
((OperatorIDTuple) arg).getOperator().addPrecedingOperator(filter);
}
return filter;