[jira] [Created] (HIVE-23886) Filter Query on External table produce no result if hive.metastore.expression.proxy set to MsckPartitionExpressionProxy

["Rajkumar Singh (Jira)" <ji...@apache.org>]

Rajkumar Singh created HIVE-23886:
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             Summary: 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


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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