@Override
    public void delete(ComplexEventChunk<StateEvent> deletingEventChunk, Object storeEvents) {
        deletingEventChunk.reset();
        while (deletingEventChunk.hasNext()) {
            StateEvent deletingEvent = deletingEventChunk.next();
            collectionExecutor.delete(deletingEvent, (IndexedEventHolder) storeEvents);
        }
    }
Operator which is related to non-indexed In-memory table operations.
modules/siddhi-core/src/main/java/io/siddhi/core/util/collection/operator/IndexOperator.java