[jira] [Created] (SPARK-17458) Alias specified for aggregates in a pivot are not honored

["Ravi Somepalli (JIRA)" <ji...@apache.org>]

Ravi Somepalli created SPARK-17458:
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             Summary: Alias specified for aggregates in a pivot are not honored
                 Key: SPARK-17458
                 URL: https://issues.apache.org/jira/browse/SPARK-17458
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Ravi Somepalli


When using pivot and multiple aggregations we need to alias to avoid special characters, but alias does not help because 

df.groupBy("C").pivot("A").agg(avg("D").as("COLD"), max("B").as("COLB")).show

||    C || bar_avg(`D`) AS `COLD` || bar_max(`B`) AS `COLB` || foo_avg(`D`) AS `COLD` || foo_max(`B`) AS `COLB` ||
|small|                   5.5|                   two|    2.3333333333333335|   two|
|large|                   5.5|                   two|                   2.0|                   one|

Expected Output
||    C || bar_COLD || bar_COLB || foo_COLD || foo_COLB ||
|small|                   5.5|                   two|    2.3333333333333335|   two|
|large|                   5.5|                   two|                   2.0|                   one|


One approach you can fix this issue is to change the class
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
 and change the outputName method in 
{code}
object ResolvePivot extends Rule[LogicalPlan] {
    def apply(plan: LogicalPlan): LogicalPlan = plan transform {
{code}

{code}
def outputName(value: Literal, aggregate: Expression): String = {
          val suffix = aggregate match {
             case n: NamedExpression => aggregate.asInstanceOf[NamedExpression].name
             case _ => aggregate.sql
           }
          if (singleAgg) value.toString else value + "_" + suffix
        }
{code}




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