private void setMetaComplexEvent(MetaComplexEvent metaComplexEvent) {
        outputStreamDefinition = metaComplexEvent.getOutputStreamDefinition();
        this.metaComplexEvent = metaComplexEvent;
    }
Query Runtime represent holder object for a single Siddhi query and holds all runtime objects related to that query.
modules/siddhi-core/src/main/java/io/siddhi/core/query/QueryRuntimeImpl.java