[teiid-issues] [JBoss JIRA] (TEIID-2219) NullPointer Exception when doing count aggregations on two individual columns from separate databases

[Ivan Chan (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-2219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723829#comment-12723829 ] 

Ivan Chan commented on TEIID-2219:
----------------------------------

Actually, it seems to work now.  Sorry about the confusion.  Let me do more testing.  Thanks.
                
> NullPointer Exception when doing count aggregations on two individual columns from separate databases
> -----------------------------------------------------------------------------------------------------
>
>                 Key: TEIID-2219
>                 URL: https://issues.jboss.org/browse/TEIID-2219
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 8.1
>         Environment: Running embedded mode
>            Reporter: Ivan Chan
>            Assignee: Steven Hawkins
>
> I have issues doing Count aggregations in 2 different databases.  2 out of 3 following cases fail...  (But distinct count seems ok)
>  
> <----------- CASE 1 ---------->   SUM first, then COUNT => OK
>  
> SUM(DB_2.field_1), COUNT(DB_1.field_1)
>  
> select sum("FoodmartDataSourceJNDI_public_expense_fact"."amount") as "FoodmartDataSourceJNDI_public_expense_fact_amount_Sum",
> count("FoodmartDataSource_public_employee"."full_name") as "FoodmartDataSource_public_employee_full_name_Count"
> from "FoodmartDataSource_public"."employee" "FoodmartDataSource_public_employee"
> inner join "FoodmartDataSourceJNDI_public"."expense_fact" "FoodmartDataSourceJNDI_public_expense_fact" on ("FoodmartDataSource_public_employee"."store_id" = "FoodmartDataSourceJNDI_public_expense_fact"."store_id")
>  
>  
> SELECT g_0."store_id" AS c_0, g_0."full_name" AS c_1 FROM "public"."employee" AS g_0 ORDER BY c_0
>  
>  
> SELECT g_0."store_id" AS c_0, SUM(g_0."amount") AS c_1 FROM "public"."expense_fact" AS g_0 GROUP BY g_0."store_id" ORDER BY c_0
>  
> <-----------CASE 2 --------------->  COUNT first, then SUM  =>  ERROR
>  
> COUNT(DB_1.field_1), SUM(DB_2.field_1)
>  
>  
> select count("FoodmartDataSourceJNDI_public_expense_fact"."category_id") as "FoodmartDataSourceJNDI_public_expense_fact_category_id_Count",
> sum("FoodmartDataSource_public_employee"."salary") as "FoodmartDataSource_public_employee_salary_Sum"
> from "FoodmartDataSource_public"."employee" "FoodmartDataSource_public_employee"
> inner join "FoodmartDataSourceJNDI_public"."expense_fact" "FoodmartDataSourceJNDI_public_expense_fact" on ("FoodmartDataSource_public_employee"."store_id" = "FoodmartDataSourceJNDI_public_expense_fact"."store_id")
>  
> Caused by: java.lang.NullPointerException
>           at org.teiid.query.processor.relational.GroupingNode.initialize(GroupingNode.java:184)
>           at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:108)
>           at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:113)
>           at org.teiid.query.processor.relational.RelationalPlan.initialize(RelationalPlan.java:103)
>           at org.teiid.query.processor.QueryProcessor.init(QueryProcessor.java:194)
>           at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:130)
>           at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:109)
>           at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:153)
>           at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:382)
>           at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:291)
>           ... 123 more
>  
> <-----------CASE 3 --------------->  COUNT on DB1.COL1 and COUNT on DB2.COL2 =>  ERROR
>  
> COUNT(DB_1.field_1), COUNT(DB_2.field_1)
>  
> select count("FoodmartDataSourceJNDI_public_expense_fact"."category_id") as "FoodmartDataSourceJNDI_public_expense_fact_category_id_Count",
> count("FoodmartDataSource_public_employee"."first_name") as "FoodmartDataSource_public_employee_first_name_Count"
> from "FoodmartDataSource_public"."employee" "FoodmartDataSource_public_employee"
> inner join "FoodmartDataSourceJNDI_public"."expense_fact" "FoodmartDataSourceJNDI_public_expense_fact" on ("FoodmartDataSource_public_employee"."store_id" = "FoodmartDataSourceJNDI_public_expense_fact"."store_id")
>  
> Caused by: java.lang.NullPointerException
>           at org.teiid.query.processor.relational.GroupingNode.initialize(GroupingNode.java:184)
>           at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:108)
>           at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:113)
>           at org.teiid.query.processor.relational.RelationalPlan.initialize(RelationalPlan.java:103)
>           at org.teiid.query.processor.QueryProcessor.init(QueryProcessor.java:194)
>           at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:130)
>           at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:109)
>           at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:153)
>           at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:382)
>           at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:291)
>           ... 123 more

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