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From "Thomas D'Silva (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-5087) Inner Join Cursor Query fails with NullPointerException - JoinCompiler.java:187
Date Thu, 03 Jan 2019 22:02:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-5087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16733563#comment-16733563
] 

Thomas D'Silva commented on PHOENIX-5087:
-----------------------------------------

[~swaroopa] any chance you can look into this?

> Inner Join Cursor Query fails with NullPointerException - JoinCompiler.java:187
> -------------------------------------------------------------------------------
>
>                 Key: PHOENIX-5087
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-5087
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.14.1
>            Reporter: Jack Steenkamp
>            Priority: Major
>         Attachments: PhoenixInnerJoinCursorTest.java
>
>
> I have come across an inner join query in my application that fails with the NullPointerException
if executed as part of a Cursor, but executes fine if done without it. 
>  
> To reproduce this issue, you can run the attached program (assuming you update the JDBC_URL
to point to an instance you have running) or you can follow the steps below:
>  
> Create the Table:
>  
> CREATE TABLE IF NOT EXISTS MY_STATS
> ( 
>    ID                   VARCHAR    NOT NULL,
>    ENTRY_NAME                     VARCHAR    ,
>    ENTRY_VALUE           DOUBLE     ,
>    TRANSACTION_TIME               TIMESTAMP  ,
>    CONSTRAINT pk PRIMARY KEY(ID)
> ) 
> IMMUTABLE_STORAGE_SCHEME=ONE_CELL_PER_COLUMN,
> UPDATE_CACHE_FREQUENCY=900000,
> COLUMN_ENCODED_BYTES=NONE,
> IMMUTABLE_ROWS=true
>  
> Execute a normal query (this works fine):
>  
> SELECT * FROM MY_STATS
>    INNER JOIN 
>    (
>     SELECT ENTRY_NAME, MAX(TRANSACTION_TIME) AS TRANSACTION_TIME 
>   FROM MY_STATS 
>      GROUP BY ENTRY_NAME
>    ) sub
>    ON MY_STATS.ENTRY_NAME = sub.ENTRY_NAME AND MY_STATS.TRANSACTION_TIME = sub.TRANSACTION_TIME 
> ORDER BY MY_STATS.TRANSACTION_TIME DESC 
>  
> Now if you execute the same query, but with the cursor declaration at the top - 
>  
> DECLARE MyCursor CURSOR FOR 
>  
> It produces the following exception:
>  
> Exception in thread "main" java.lang.NullPointerException
>  at org.apache.phoenix.compile.JoinCompiler$JoinTableConstructor.resolveTable(JoinCompiler.java:187)
>  at org.apache.phoenix.compile.JoinCompiler$JoinTableConstructor.visit(JoinCompiler.java:224)
>  at org.apache.phoenix.compile.JoinCompiler$JoinTableConstructor.visit(JoinCompiler.java:181)
>  at org.apache.phoenix.parse.DerivedTableNode.accept(DerivedTableNode.java:49)
>  at org.apache.phoenix.compile.JoinCompiler$JoinTableConstructor.visit(JoinCompiler.java:201)
>  at org.apache.phoenix.compile.JoinCompiler$JoinTableConstructor.visit(JoinCompiler.java:181)
>  at org.apache.phoenix.parse.JoinTableNode.accept(JoinTableNode.java:81)
>  at org.apache.phoenix.compile.JoinCompiler.compile(JoinCompiler.java:138)
>  at org.apache.phoenix.compile.QueryCompiler.compileSelect(QueryCompiler.java:190)
>  at org.apache.phoenix.compile.QueryCompiler.compile(QueryCompiler.java:153)
>  at org.apache.phoenix.jdbc.PhoenixStatement$ExecutableSelectStatement.compilePlan(PhoenixStatement.java:490)
>  at org.apache.phoenix.jdbc.PhoenixStatement$ExecutableDeclareCursorStatement.compilePlan(PhoenixStatement.java:950)
>  at org.apache.phoenix.jdbc.PhoenixStatement$ExecutableDeclareCursorStatement.compilePlan(PhoenixStatement.java:941)
>  at org.apache.phoenix.jdbc.PhoenixStatement$2.call(PhoenixStatement.java:401)
>  at org.apache.phoenix.jdbc.PhoenixStatement$2.call(PhoenixStatement.java:391)
>  at org.apache.phoenix.call.CallRunner.run(CallRunner.java:53)
>  at org.apache.phoenix.jdbc.PhoenixStatement.executeMutation(PhoenixStatement.java:390)
>  at org.apache.phoenix.jdbc.PhoenixStatement.executeMutation(PhoenixStatement.java:378)
>  at org.apache.phoenix.jdbc.PhoenixStatement.execute(PhoenixStatement.java:1825)
>  at com.jsteenkamp.phoenix.PhoenixInnerJoinCursorTest.testCursorQuery(PhoenixInnerJoinCursorTest.java:68)
>  at com.jsteenkamp.phoenix.PhoenixInnerJoinCursorTest.main(PhoenixInnerJoinCursorTest.java:20)



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