Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12067#issuecomment-206755637
generated code snippet in whole stage codegen for
`val ds = Seq(("a", 10)).toDS().groupByKey(_._1).agg(typed.sum(_._2))`:
```
/* 095 */ // evaluate aggregate function
/* 096 */ /*
org.apache.spark.sql.execution.aggregate.TypedSumDouble@25ffdd4a.reduce */
/* 097 */ /*
org.apache.spark.sql.execution.aggregate.TypedSumDouble@25ffdd4a */
/* 098 */ /* expression:
org.apache.spark.sql.execution.aggregate.TypedSumDouble@25ffdd4a */
/* 099 */ Object agg_obj = ((Expression) references[1]).eval(null);
/* 100 */ org.apache.spark.sql.expressions.Aggregator agg_value4 =
(org.apache.spark.sql.expressions.Aggregator) agg_obj;
/* 101 */ /* input[0, double] */
/* 102 */ double agg_value5 = agg_aggBuffer.getDouble(0);
/* 103 */ /* newInstance(class scala.Tuple2) */
/* 104 */ /* input[1, string].toString */
/* 105 */ java.lang.String agg_value7 = inputadapter_isNull ? null :
(java.lang.String) inputadapter_value.toString();
/* 106 */ boolean agg_isNull7 = agg_value7 == null;
/* 107 */
/* 108 */ final scala.Tuple2 agg_value6 = new
scala.Tuple2(agg_value7, inputadapter_value1);
/* 109 */ final boolean agg_isNull6 = false;
/* 110 */ double agg_value3 = false ? -1.0 : (double)
((java.lang.Double)agg_value4.reduce(agg_value5, agg_value6)).doubleValue();
/* 111 */ // update aggregate buffer
/* 112 */ if (!false) {
/* 113 */ agg_aggBuffer.setDouble(0, agg_value3);
/* 114 */ } else {
/* 115 */ agg_aggBuffer.setNullAt(0);
/* 116 */ }
```
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