public void setCollectionExpr(CompiledValue collectionExpr) {
    this.collectionExpr = collectionExpr;
  }
Evaluate just the collectionExpr

@param stopAtIter the RuntimeIterator associated with this iterator defn -- don't use this or
       any subsequent runtime iterators to evaluate.
geode-core/src/main/java/org/apache/geode/cache/query/internal/CompiledIteratorDef.java