RuntimeIterator findRuntimeIterator(CompiledValue expr) {
    // Check if expr is itself RuntimeIterator
    if (expr instanceof RuntimeIterator) {
      return (RuntimeIterator) expr;
    }
    // Try to find RuntimeIterator
    return (RuntimeIterator) findIterator(expr);
  }
Tries to find for RuntimeIterator associated with specified expression
geode-core/src/main/java/org/apache/geode/cache/query/internal/ExecutionContext.java