The MAPJOIN hint rises an error with ORDER BY and LIMIT clauses
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Key: HIVE-1217
URL: https://issues.apache.org/jira/browse/HIVE-1217
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.5.0, 0.4.1
Reporter: Ruslan Salyakhov
Priority: Minor
the simple test-case:
hive> CREATE TABLE t1 (id INT, name STRING) ROW FORMAT DELIMITED FIELDS
TERMINATED BY '\t' STORED AS TEXTFILE;
hive> CREATE TABLE t2 (id INT, name STRING) ROW FORMAT DELIMITED FIELDS
TERMINATED BY '\t' STORED AS TEXTFILE;
hive> CREATE TABLE t3 (id INT, t1_id INT, t2_id INT) ROW FORMAT DELIMITED
FIELDS TERMINATED BY '\t' STORED AS TEXTFILE;
$ for x in `seq 0 9`; do echo -e "$x\tt1_$x"; done > t1_data
$ for x in `seq 0 9`; do echo -e "$x\tt2_$x"; done > t2_data
$ for x in `seq 0 99`; do echo -e "$x\t$(($RANDOM%10))\t$(($RANDOM%10))"; done
> t3_data
$ hadoop fs -mkdir /test-hive/data/
$ hadoop fs -copyFromLocal t?_data /test-hive/data/
hive> load data inpath '/test-hive/data/t1_data' into table t1;
hive> load data inpath '/test-hive/data/t2_data' into table t2;
hive> load data inpath '/test-hive/data/t3_data' into table t3;
hive> select t3.id, t1.name, t2.name from t3 join t1 on (t3.t1_id = t1.id) join
t2 on (t3.t2_id = t2.id) order by t3.id limit 10;
works fine
hive> select /*+ MAPJOIN(t2,t3) */ t3.id, t1.name, t2.name from t3 join t1 on
(t3.t1_id = t1.id) join t2 on (t3.t2_id = t2.id) limit 10;
works fine
hive> select /*+ MAPJOIN(t2,t3) */ t3.id, t1.name, t2.name from t3 join t1 on
(t3.t1_id = t1.id) join t2 on (t3.t2_id = t2.id) order by t3.id limit 10;
FAILED: Execution Error, return code 2 from
org.apache.hadoop.hive.ql.exec.ExecDriver
taskdetails, Errors:
{code}
java.lang.RuntimeException
at org.apache.hadoop.hive.ql.exec.ExecMapper.map(ExecMapper.java:188)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.hive.ql.exec.MapJoinOperator.processOp(MapJoinOperator.java:218)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:386)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:598)
at
org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:81)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:386)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:598)
at
org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:347)
at org.apache.hadoop.hive.ql.exec.ExecMapper.map(ExecMapper.java:171)
... 4 more
{code}
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