Aman Sinha created DRILL-536:
--------------------------------
Summary: HashAggregate encounters NPE when no aggregate functions
are present
Key: DRILL-536
URL: https://issues.apache.org/jira/browse/DRILL-536
Project: Apache Drill
Issue Type: Bug
Reporter: Aman Sinha
Assignee: Aman Sinha
For a plan that contains only group-by keys and no aggregate functions, we
encounter a NPE, which is coming during code generation. See below. The
physical plan to reproduce is also given below.
{
head : {
version : 1,
generator : {
type : "optiq",
info : "na"
},
type : "APACHE_DRILL_PHYSICAL"
},
graph : [ {
"pop" : "parquet-scan",
"@id" : 1,
"entries" : [ {
"path" : "tpch/nation.parquet"
} ],
"storage" : {
"type" : "file",
"connection" : "classpath:///"
},
"format" : {
"type" : "parquet"
}
}, {
pop : "project",
@id : 2,
exprs : [ {
ref : "output.$f0",
expr : "N_REGIONKEY"
}, {
ref : "output.$f1",
expr : "N_NATIONKEY"
}, {
ref : "output.$f2",
expr : "N_NAME"
} ],
child : 1
}, {
pop : "hash-aggregate",
@id : 3,
child : 2,
keys : [ {
ref : "$f0",
expr : "$f0"
}, {
ref : "$f1",
expr : "$f1"
}, {
ref : "$f2",
expr : "$f2 "
} ]
}, {
pop : "screen",
@id : 4,
child : 3
} ]
}
java.lang.NullPointerException
org.apache.drill.exec.physical.impl.aggregate.HashAggBatch.createAggregatorInternal(HashAggBatch.java:184)
~[classes/:na]
org.apache.drill.exec.physical.impl.aggregate.HashAggBatch.createAggregator(HashAggBatch.java:165)
~[classes/:na]
org.apache.drill.exec.physical.impl.aggregate.HashAggBatch.next(HashAggBatch.java:112)
~[classes/:na]
org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next(IteratorValidatorBatchIterator.java:107)
~[classes/:na]
org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.next(ScreenCreator.java:85)
~[classes/:na]
org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:83)
~[classes/:na]
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