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From "Jack Steenkamp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-5087) Inner Join Cursor Query fails with NullPointerException - JoinCompiler.java:187
Date Wed, 02 Jan 2019 21:16:00 GMT
Jack Steenkamp created PHOENIX-5087:
---------------------------------------

             Summary: 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
         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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