public void handle(Values values) {
      if (ASTConverter.this.select == null) {
        ASTConverter.this.select = values;
      } else {
        ASTConverter.this.from = values;
      }
    }
Add PK-FK join information to the AST as a query hint
@param ast
@param join
@param swapSides whether the left and right input of the join is swapped
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/translator/ASTConverter.java