@Override
    protected StateFactory init(ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader,
                                SiddhiQueryContext siddhiQueryContext) {
        return null;
    }
Executor class for Siddhi that extracts events.
modules/siddhi-core/src/main/java/io/siddhi/core/executor/EventVariableFunctionExecutor.java