private String generateStreamVarName() {
        String name = "strVar" + this.streamVarCount;
        this.streamVarCount++;
        return name;
    }
Method for generating a temporary placeholder for stream variables.

@return a placeholder string of known format.
modules/siddhi-core/src/test/java/io/siddhi/core/query/table/util/TestStoreConditionVisitor.java