@Override
    protected IrRowPattern visitIrQuantified(IrQuantified node, Void context) {
      IrRowPattern child = process(node.getPattern());

      return new IrQuantified(child, node.getQuantifier());
    }
Remove empty pattern from pattern alternation and replace it with quantification of a
neighbouring term.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/rowpattern/IrPatternAlternationOptimizer.java