union with two mapjoin will throw NPE

create table src (key string, value string);
create table src1 (key string, value string);

select count from (
select /+mapjoin(b)/ a.*
from src a
join
src1 b
on a.key=b.key
where a.key=48
union all
select /+mapjoin(bb)/ aa.*
from src aa
join
src1 bb
on aa.key=bb.key
where aa.key=100
) t;

FAILED: Hive Internal Error: java.lang.NullPointerException(null)
java.lang.NullPointerException
at org.apache.hadoop.hive.ql.optimizer.ppr.PartitionPruner.prune(PartitionPruner.java:156)
at org.apache.hadoop.hive.ql.optimizer.GenMapRedUtils.setTaskPlan(GenMapRedUtils.java:553)
at org.apache.hadoop.hive.ql.optimizer.GenMapRedUtils.setTaskPlan(GenMapRedUtils.java:514)
at org.apache.hadoop.hive.ql.optimizer.GenMapRedUtils.initPlan(GenMapRedUtils.java:125)
at org.apache.hadoop.hive.ql.optimizer.GenMRRedSink1.process(GenMRRedSink1.java:76)
at org.apache.hadoop.hive.ql.optimizer.GenMRRedSink3.process(GenMRRedSink3.java:64)
at org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:89)
at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:88)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:55)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.parse.GenMapRedWalker.walk(GenMapRedWalker.java:67)
at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:102)
at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genMapRedTasks(SemanticAnalyzer.java:6946)
at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:7247)
at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:240)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:431)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:337)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:904)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:279)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:228)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:417)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:350)
at org.apache.hadoop.hive.cli.CliDriver.processReader(CliDriver.java:451)
at org.apache.hadoop.hive.cli.CliDriver.processFile(CliDriver.java:461)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:675)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:585)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:186)