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https://issues.apache.org/jira/browse/HIVE-23886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17162485#comment-17162485
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Syed Shameerur Rahman commented on HIVE-23886:
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[~Rajkumar Singh] Any specific reason for setting
hive.metastore.expression.proxy to MsckPartitionExpressionProxy ?
> Filter Query on External table produce no result if
> hive.metastore.expression.proxy set to MsckPartitionExpressionProxy
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-23886
> URL: https://issues.apache.org/jira/browse/HIVE-23886
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 3.1.0
> Reporter: Rajkumar Singh
> Priority: Major
>
> query such as "select count(1) from tpcds_10_parquet.store_returns where
> sr_returned_date_sk=2452802" return row count as 0 even though partition has
> enough rows in it.
> upon investigation, I found that partition list passed during the
> StatsUtils.getNumRows is of zero size.
> https://github.com/apache/hive/blob/ccaf783a198e142b408cb57415c4262d27b45831/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/RelOptHiveTable.java#L438-L439
> it seems partitionlist is retrieved during PartitionPruner
> https://github.com/apache/hive/blob/36bf7f00731e3b95af3e5eeaa4ce39b375974a74/ql/src/java/org/apache/hadoop/hive/ql/optimizer/ppr/PartitionPruner.java#L439
> Hive serialized this filter expression using Kryo before passing to HMS
> https://github.com/apache/hive/blob/36bf7f00731e3b95af3e5eeaa4ce39b375974a74/ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java#L3931
> on the server-side if the hive.metastore.expression.proxy set to
> MsckPartitionExpressionProxy it tries to convert this expression into the
> string
> https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MsckPartitionExpressionProxy.java#L50
> https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MsckPartitionExpressionProxy.java#L56
> because of this bad filter expression hive did not retrieve any partitions, I
> think to make it work hive should try to deserialize it similar to
> PartitionExpressionForMetastore.
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