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https://issues.apache.org/jira/browse/HIVE-28311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17856729#comment-17856729
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Stamatis Zampetakis commented on HIVE-28311:
--------------------------------------------
[~wechar] Can you please add more details around the actual use case/setup that
leads to this ClassCastException. It would be nice if we can ensure that
changes are backward compatible but we should be mindful not generate
correctness problems in doing so.
> Backward compatibility of java.sql.Date and java.sql.Timestamp in hive-serde
> ----------------------------------------------------------------------------
>
> Key: HIVE-28311
> URL: https://issues.apache.org/jira/browse/HIVE-28311
> Project: Hive
> Issue Type: Bug
> Reporter: Wechar
> Assignee: Wechar
> Priority: Major
> Labels: pull-request-available
>
> HIVE-20007 introduced {{org.apache.hadoop.hive.common.type.Date}} and
> {{org.apache.hadoop.hive.common.type.Timestamp}} to replace {{java.sql.Date}}
> and {{{}java.sql.Timestamp{}}}.
> It's a huge improvements but it also produce incompatibility issues for
> clients without this update.
> {code:bash}
> Caused by: java.lang.ClassCastException: java.sql.Timestamp cannot be cast to
> org.apache.hadoop.hive.common.type.Timestamp
> at
> org.apache.hadoop.hive.serde2.objectinspector.primitive.JavaTimestampObjectInspector.getPrimitiveWritableObject(JavaTimestampObjectInspector.java:33)
> at
> org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils.getTimestamp(PrimitiveObjectInspectorUtils.java:1232)
> at
> org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorConverter$TimestampConverter.convert(PrimitiveObjectInspectorConverter.java:291)
> at
> org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.getConstantObjectInspector(ObjectInspectorUtils.java:1397)
> at
> org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc.getWritableObjectInspector(ExprNodeConstantDesc.java:93)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeConstantEvaluator.<init>(ExprNodeConstantEvaluator.java:41)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeEvaluatorFactory.get(ExprNodeEvaluatorFactory.java:49)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator.<init>(ExprNodeGenericFuncEvaluator.java:101)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeEvaluatorFactory.get(ExprNodeEvaluatorFactory.java:58)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeEvaluatorFactory.get(ExprNodeEvaluatorFactory.java:43)
> at
> org.apache.hadoop.hive.ql.optimizer.ppr.PartExprEvalUtils.prepareExpr(PartExprEvalUtils.java:118)
> at
> org.apache.hadoop.hive.ql.optimizer.ppr.PartitionPruner.prunePartitionNames(PartitionPruner.java:551)
> at
> org.apache.hadoop.hive.ql.optimizer.ppr.PartitionExpressionForMetastore.filterPartitionsByExpr(PartitionExpressionForMetastore.java:73)
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getPartitionNamesPrunedByExprNoTxn(ObjectStore.java:3606)
> at
> org.apache.hadoop.hive.metastore.ObjectStore.access$1000(ObjectStore.java:241)
> at
> org.apache.hadoop.hive.metastore.ObjectStore$16.getJdoResult(ObjectStore.java:4157)
> at
> org.apache.hadoop.hive.metastore.ObjectStore$16.getJdoResult(ObjectStore.java:4124)
> at
> org.apache.hadoop.hive.metastore.ObjectStore$GetHelper.run(ObjectStore.java:3913)
> ... 30 more
> {code}
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