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From "Mich Talebzadeh" <m...@peridale.co.uk>
Subject RE: NPE from simple nested ANSI Join
Date Fri, 05 Feb 2016 09:17:30 GMT
Hi Dave,

 

Your schema looks like this

 

NATION --< CUSTOMER --< ORDERS

 

I have a similar schema with the following relationship

 

COUNTRIES --< CUSTOMERS --< SALES

 

I tried this one and it works both in Hive 1.2.1 and Spark getting total sales for each country

 

SELECT c.country_name AS nation,

       sum (amount_sold) AS salesamount

FROM  countries c

INNER JOIN customers cs

ON c.country_id = cs.country_id

INNER JOIN sales s

ON cs.cust_id = s.cust_id

GROUP BY country_name

ORDER BY country_name

 

It works OK

 

HTH

 

Dr Mich Talebzadeh

 

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Author of the books "A Practitioner’s Guide to Upgrading to Sybase ASE 15", ISBN 978-0-9563693-0-7.


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From: Dave Nicodemus [mailto:dave.nicodemus@gmail.com] 
Sent: 04 February 2016 19:29
To: user@hive.apache.org
Subject: NPE from simple nested ANSI Join

 

Using hive 1.2.1.2.3  Connecting using JDBC, issuing the following query : 

 

SELECT COUNT(*) 

FROM nation n 

    INNER JOIN (customer c

                         INNER JOIN orders o ON c.c_custkey = o.o_custkey)

     ON n.n_nationkey = c.c_nationkey;

 

Generates the NPE and stack below. Fields are integer data type

 

Does anyone know if this is a known issue  and whether it's fixed someplace ?

 

Thanks,

Dave

 

Stack

--------

Caused by: java.lang.NullPointerExcEeption: Remote java.lang.NullPointerException: null

        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.isPresent(SemanticAnalyzer.java:2046)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.parseJoinCondPopulateAlias(SemanticAnalyzer.java:2109)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.parseJoinCondPopulateAlias(SemanticAnalyzer.java:2185)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.parseJoinCondition(SemanticAnalyzer.java:2445)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.parseJoinCondition(SemanticAnalyzer.java:2386)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genJoinTree(SemanticAnalyzer.java:8192)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genJoinTree(SemanticAnalyzer.java:8131)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:9709)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genPlan(SemanticAnalyzer.java:9636)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genOPTree(SemanticAnalyzer.java:10109)
        at org.apache.hadoop.hive.ql.parse.CalcitePlanner.genOPTree(CalcitePlanner.java:329)
        at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:10120)
        at org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:211)
        at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:227)
        at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:454)
        at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:314)
        at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1164)
        at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:1158)
        at org.apache.hive.service.cli.operation.SQLOperation.prepare(SQLOperation.java:110)

 

 

 


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