public PdxString getSavedPdxString() {
    if (_pdxString == null) {
      _pdxString = new PdxString((String) _obj);
    }
    return _pdxString;
  }
creates new PdxString from String and caches it
geode-core/src/main/java/org/apache/geode/cache/query/internal/CompiledLiteral.java