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package org.apache.hadoop.hive.ql.plan;
unionDesc is a empty class currently. However, union has more than one input (as compared with forward), and therefore, we need a separate class.
@Explain(displayName = "Union")
public class UnionDesc implements Serializable {
  private static final long serialVersionUID = 1L;
  private transient int numInputs;
  public UnionDesc() {
     = 2;


the numInputs
  public int getNumInputs() {
    return ;


numInputs the numInputs to set
  public void setNumInputs(int numInputs) {
    this. = numInputs;
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