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https://issues.apache.org/jira/browse/SPARK-13680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970390#comment-15970390
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Yael Aharon commented on SPARK-13680:
-------------------------------------
This has been fixed in spark 1.6. It can probably be closed.
> Java UDAF with more than one intermediate argument returns wrong results
> ------------------------------------------------------------------------
>
> Key: SPARK-13680
> URL: https://issues.apache.org/jira/browse/SPARK-13680
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.0
> Environment: CDH 5.5.2
> Reporter: Yael Aharon
> Attachments: data.csv, setup.hql
>
>
> I am trying to incorporate the Java UDAF from
> https://github.com/apache/spark/blob/master/sql/hive/src/test/java/org/apache/spark/sql/hive/aggregate/MyDoubleAvg.java
> into an SQL query.
> I registered the UDAF like this:
> sqlContext.udf().register("myavg", new MyDoubleAvg());
> My SQL query is:
> SELECT AVG(seqi) AS `avg_seqi`, AVG(seqd) AS `avg_seqd`, AVG(ci) AS `avg_ci`,
> AVG(cd) AS `avg_cd`, AVG(stdevd) AS `avg_stdevd`, AVG(stdevi) AS
> `avg_stdevi`, MAX(seqi) AS `max_seqi`, MAX(seqd) AS `max_seqd`, MAX(ci) AS
> `max_ci`, MAX(cd) AS `max_cd`, MAX(stdevd) AS `max_stdevd`, MAX(stdevi) AS
> `max_stdevi`, MIN(seqi) AS `min_seqi`, MIN(seqd) AS `min_seqd`, MIN(ci) AS
> `min_ci`, MIN(cd) AS `min_cd`, MIN(stdevd) AS `min_stdevd`, MIN(stdevi) AS
> `min_stdevi`,SUM(seqi) AS `sum_seqi`, SUM(seqd) AS `sum_seqd`, SUM(ci) AS
> `sum_ci`, SUM(cd) AS `sum_cd`, SUM(stdevd) AS `sum_stdevd`, SUM(stdevi) AS
> `sum_stdevi`, myavg(seqd) as `myavg_seqd`, AVG(zero) AS `avg_zero`,
> AVG(nulli) AS `avg_nulli`,AVG(nulld) AS `avg_nulld`, SUM(zero) AS `sum_zero`,
> SUM(nulli) AS `sum_nulli`,SUM(nulld) AS `sum_nulld`,MAX(zero) AS `max_zero`,
> MAX(nulli) AS `max_nulli`,MAX(nulld) AS `max_nulld`,count( * ) AS
> `count_all`, count(nulli) AS `count_nulli` FROM mytable
> As soon as I add the UDAF myavg to the SQL, all the results become incorrect.
> When I remove the call to the UDAF, the results are correct.
> I was able to go around the issue by modifying bufferSchema of the UDAF to
> use an array and the corresponding update and merge methods.
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