@Override
  public <R, C> R accept(final PlanVisitor<R, C> visitor, final C context) {
    return visitor.visitAlterLogicalView(this, context);
  }
A map from target path to source expression. Yht target path is the name of this logical view,
and the source expression is the data source of this view.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/metadata/write/view/AlterLogicalViewNode.java