public Builder withConfOverlay(Map<String, String> confOverlay) {
      this.confOverlay = confOverlay;
      return this;
    }
Set this if there are specific configuration values which should be added to the original
config. If at least one value is set, then the configuration will be detached from the
original one.
@param confOverlay The query specific parameters
@return The builder
ql/src/java/org/apache/hadoop/hive/ql/QueryState.java