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https://issues.apache.org/jira/browse/SPARK-24401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16493118#comment-16493118
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Jorge Machado commented on SPARK-24401:
---------------------------------------
Yes, I just tried my code and it works on spark 2.3.0
> Aggreate on Decimal Types does not work
> ---------------------------------------
>
> Key: SPARK-24401
> URL: https://issues.apache.org/jira/browse/SPARK-24401
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Jorge Machado
> Priority: Major
> Fix For: 2.3.0
>
> Attachments: testDF.parquet
>
>
> Hi,
> I think I found a really ugly bug in spark when performing aggregations with
> Decimals
> To reproduce:
>
> {code:java}
> val df = spark.read.parquet("attached file")
> val first_agg = fact_df.groupBy("id1", "id2",
> "start_date").agg(mean("projection_factor").alias("projection_factor"))
> first_agg.show
> val second_agg =
> first_agg.groupBy("id1","id2").agg(max("projection_factor").alias("maxf"),
> min("projection_factor").alias("minf"))
> second_agg.show
> {code}
> First aggregation works fine the second aggregation seems to be summing
> instead of max value. I tried with spark 2.2.0 and 2.3.0 same problem.
> The dataset as circa 800 Rows and the projection_factor has values from 0
> until 100. the result should not be bigger that 5 but with get
> 265820543091454.... as result back.
>
>
> As Code not 100% the same but I think there is really a bug there:
>
> {code:java}
> BigDecimal [] objects = new BigDecimal[]{
> new BigDecimal(3.5714285714D),
> new BigDecimal(3.5714285714D),
> new BigDecimal(3.5714285714D),
> new BigDecimal(3.5714285714D)};
> Row dataRow = new GenericRow(objects);
> Row dataRow2 = new GenericRow(objects);
> StructType structType = new StructType()
> .add("id1", DataTypes.createDecimalType(38,10), true)
> .add("id2", DataTypes.createDecimalType(38,10), true)
> .add("id3", DataTypes.createDecimalType(38,10), true)
> .add("id4", DataTypes.createDecimalType(38,10), true);
> final Dataset<Row> dataFrame =
> sparkSession.createDataFrame(Arrays.asList(dataRow,dataRow2), structType);
> System.out.println(dataFrame.schema());
> dataFrame.show();
> final Dataset<Row> df1 = dataFrame.groupBy("id1","id2")
> .agg( mean("id3").alias("projection_factor"));
> df1.show();
> final Dataset<Row> df2 = df1
> .groupBy("id1")
> .agg(max("projection_factor"));
> df2.show();
> {code}
>
> The df2 should have:
> {code:java}
> +------------+----------------------+
> | id1|max(projection_factor)|
> +------------+----------------------+
> |3.5714285714| 3.5714285714|
> +------------+----------------------+
> {code}
> instead it returns:
> {code:java}
> +------------+----------------------+
> | id1|max(projection_factor)|
> +------------+----------------------+
> |3.5714285714| 0.00035714285714|
> +------------+----------------------+
> {code}
>
>
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