Amruth S created HIVE-19225:
-------------------------------
Summary: Class cast exception while running certain queries with
UDAF like rank on internal struct columns
Key: HIVE-19225
URL: https://issues.apache.org/jira/browse/HIVE-19225
Project: Hive
Issue Type: Bug
Components: Hive
Affects Versions: 2.3.2
Reporter: Amruth S
Certain queries with rank function is causing class cast exception.
{noformat}
Caused by: java.lang.ClassCastException:
org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryStruct cannot be cast to
org.apache.hadoop.hive.serde2.io.TimestampWritable
at
org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableTimestampObjectInspector.getPrimitiveJavaObject(WritableTimestampObjectInspector.java:39)
at
org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableTimestampObjectInspector.getPrimitiveJavaObject(WritableTimestampObjectInspector.java:25)
at
org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.copyToStandardObject(ObjectInspectorUtils.java:412)
at
org.apache.hadoop.hive.ql.udf.generic.GenericUDAFRank.copyToStandardObject(GenericUDAFRank.java:219)
at
org.apache.hadoop.hive.ql.udf.generic.GenericUDAFRank$GenericUDAFAbstractRankEvaluator.iterate(GenericUDAFRank.java:153)
at
org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.aggregate(GenericUDAFEvaluator.java:192)
at
org.apache.hadoop.hive.ql.udf.ptf.WindowingTableFunction.processRow(WindowingTableFunction.java:407)
at
org.apache.hadoop.hive.ql.exec.PTFOperator$PTFInvocation.processRow(PTFOperator.java:325)
at
org.apache.hadoop.hive.ql.exec.PTFOperator.process(PTFOperator.java:139)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:897)
at
org.apache.hadoop.hive.ql.exec.SelectOperator.process(SelectOperator.java:95)
at
org.apache.hadoop.hive.ql.exec.mr.ExecReducer.reduce(ExecReducer.java:236)
... 7 more
2018-03-29 09:28:43,432 INFO [main] org.apache.hadoop.mapred.Task: Runnning
cleanup for the task
{noformat}
The following changes fixes this.
The evaluator seem to skip the case where the primary obj emitted is struct.
Modified the code to find the field inside struct
{code:java}
diff --git
a/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/StandardStructObjectInspector.java
b/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/StandardStructObjectInspector.java
index 36a500790a..e7731e99d7 100644
---
a/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/StandardStructObjectInspector.java
+++
b/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/StandardStructObjectInspector.java
@@ -22,6 +22,7 @@
import java.util.Arrays;
import java.util.List;
+import org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryStruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -171,6 +172,10 @@ public Object getStructFieldData(Object data, StructField
fieldRef) {
// so we have to do differently.
boolean isArray = data.getClass().isArray();
if (!isArray && !(data instanceof List)) {
+ if (data instanceof LazyBinaryStruct
+ && fieldRef.getFieldObjectInspector().getCategory() == Category.PRIMITIVE) {
+ return ((LazyBinaryStruct) data).getField(((MyField) fieldRef).fieldID);
+ }
if (!warned) {
LOG.warn("Invalid type for struct " + data.getClass());
LOG.warn("ignoring similar errors.");
{code}
Let me know your thoughts
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