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https://issues.apache.org/jira/browse/KYLIN-3967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16829174#comment-16829174
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Shaofeng SHI commented on KYLIN-3967:
-------------------------------------
Hi hejian, "derived_column" is a "virtual" dimension which depends on the
hosting dimension (the foreign key); Filterings on derived dimension can not be
pushed down to storage engine, so there is some limitation for its use. In this
case, please make "drived_dimension" as a normal dimension.
> sum along with case expression does not work in query
> -----------------------------------------------------
>
> Key: KYLIN-3967
> URL: https://issues.apache.org/jira/browse/KYLIN-3967
> Project: Kylin
> Issue Type: Bug
> Components: Query Engine
> Reporter: Gladson Vas
> Priority: Blocker
> Attachments: notworkingcase.jpg, workingcase.jpg
>
>
> When i try to run a query with a sum case expression combination,
> eg: select sum(case when col1<0 then 0 else col1 end ) from table
> i get the following error:
> No realization found for OLAPContext, CUBE_UNMATCHED_AGGREGATION[FunctionDesc
> [expression=SUM, parameter=CASE(<($8, 0), 0, $8), returnType=null]],
> rel#36838:OLAPTableScan.OLAP.[](table=[DEFAULT, table],ctx=,fields=[0, 1, 2,
> 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
> 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
> 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
> 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80,
> 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99,
> 100, 101, 102, 103, 104, 105, 106]) while executing SQL: "select sum (case
> when col1 <0 then 0 else col1 end ) from table LIMIT 50000"
>
> is there any way to support this sum case expression in the query engine?
> Also I get the same error when the sum operation is done on a column derived
> from a case expression in a subquery.
> eg: select sum(a.col1) from (select case when col1<0 then 0 else col1 end as
> col1 from table) a
> Thanks,
> Gladson
>
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