public void setHavingConditionExecutor(ConditionExpressionExecutor havingConditionExecutor, boolean
            containsAggregator) {
        this.havingConditionExecutor = havingConditionExecutor;
        this.containsAggregator = this.containsAggregator || containsAggregator;
    }
Processor implementation representing selector portion of the Siddhi query.
modules/siddhi-core/src/main/java/io/siddhi/core/query/selector/QuerySelector.java