public void setValidate(String validate) {
    this.validate = validate;
  }
PrimaryKeyInfo is a metadata structure containing the primary key associated with a table.
The fields include the table name, database name, constraint name, 
mapping of the position of the primary key column to the column name.
The position is one-based index.
ql/src/java/org/apache/hadoop/hive/ql/metadata/PrimaryKeyInfo.java