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https://issues.apache.org/jira/browse/HIVE-10296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16632673#comment-16632673
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Sergey Shelukhin commented on HIVE-10296:
-----------------------------------------
+1
> Cast exception observed when hive runs a multi join query on metastore
> (postgres), since postgres pushes the filter into the join, and ignores the
> condition before applying cast
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-10296
> URL: https://issues.apache.org/jira/browse/HIVE-10296
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.13.1
> Reporter: Yash Datta
> Assignee: Karthik Manamcheri
> Priority: Major
> Attachments: HIVE-10296.1.patch
>
>
> Try to drop a partition from hive:
> ALTER TABLE f___edr_bin_source___900_sub_id DROP IF EXISTS PARTITION (
> exporttimestamp=1427824800, timestamp=1427824800)
> This triggers a query on the metastore like this :
> "select "PARTITIONS"."PART_ID" from "PARTITIONS" inner join "TBLS" on
> "PARTITIONS"."TBL_ID" = "TBLS"."TBL_ID" and "TBLS"."TBL_NAME" = ? inner join
> "DBS" on "TBLS"."DB_ID" = "DBS"."DB_ID" and "DBS"."NAME" = ? inner join
> "PARTITION_KEY_VALS" "FILTER0" on "FILTER0"."PART_ID" =
> "PARTITIONS"."PART_ID" and "FILTER0"."INTEGER_IDX" = 0 inner join
> "PARTITION_KEY_VALS" "FILTER1" on "FILTER1"."PART_ID" =
> "PARTITIONS"."PART_ID" and "FILTER1"."INTEGER_IDX" = 1 where ( (((case when
> "TBLS"."TBL_NAME" = ? and "DBS"."NAME" = ? then cast("FILTER0"."PART_KEY_VAL"
> as decimal(21,0)) else null end) = ?) and ((case when "TBLS"."TBL_NAME" = ?
> and "DBS"."NAME" = ? then cast("FILTER1"."PART_KEY_VAL" as decimal(21,0))
> else null end) = ?)) )"
> In some cases, when the internal tables in postgres (metastore) have some
> amount of data, the query plan pushes the condition down into the join.
> Now because of DERBY-6358 , case when clause is used before the cast, but in
> this case , cast is evaluated before condition being evaluated. So in case we
> have different tables partitioned on string and integer columns, cast
> exception is observed!
> 15/04/06 08:41:20 ERROR metastore.ObjectStore: Direct SQL failed, falling
> back to ORM
> javax.jdo.JDODataStoreException: Error executing SQL query "select
> "PARTITIONS"."PART_ID" from "PARTITIONS" inner join "TBLS" on
> "PARTITIONS"."TBL_ID" = "TBLS"."TBL_ID" and "TBLS"."TBL_NAME" = ? inner join
> "DBS" on "TBLS"."DB_ID" = "DBS"."DB_ID" and "DBS"."NAME" = ? inner join
> "PARTITION_KEY_VALS" "FILTER0" on "FILTER0"."PART_ID" =
> "PARTITIONS"."PART_ID" and "FILTER0"."INTEGER_IDX" = 0 inner join
> "PARTITION_KEY_VALS" "FILTER1" on "FILTER1"."PART_ID" =
> "PARTITIONS"."PART_ID" and "FILTER1"."INTEGER_IDX" = 1 where ( (((case when
> "TBLS"."TBL_NAME" = ? and "DBS"."NAME" = ? then cast("FILTER0"."PART_KEY_VAL"
> as decimal(21,0)) else null end) = ?) and ((case when "TBLS"."TBL_NAME" = ?
> and "DBS"."NAME" = ? then cast("FILTER1"."PART_KEY_VAL" as decimal(21,0))
> else null end) = ?)) )".
> at
> org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:451)
>
> at
> org.datanucleus.api.jdo.JDOQuery.executeWithArray(JDOQuery.java:321)
> at
> org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getPartitionsViaSqlFilterInternal(MetaStoreDirectSql.java:300)
>
> at
> org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getPartitionsViaSqlFilter(MetaStoreDirectSql.java:211)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore$3.getSqlResult(ObjectStore.java:1915)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore$3.getSqlResult(ObjectStore.java:1909)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore$GetHelper.run(ObjectStore.java:2208)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsByExprInternal(ObjectStore.java:1909)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsByExpr(ObjectStore.java:1882)
>
> org.postgresql.util.PSQLException: ERROR: invalid input syntax for type
> numeric: "__DEFAULT_BINSRC__"
> 15/04/06 08:41:20 INFO metastore.ObjectStore: JDO filter pushdown cannot be
> used: Filtering is supported only on partition keys of type string
> 15/04/06 08:41:20 ERROR metastore.ObjectStore:
> javax.jdo.JDOException: Exception thrown when executing query
> at
> org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:596)
>
> at org.datanucleus.api.jdo.JDOQuery.execute(JDOQuery.java:275)
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getPartitionNamesNoTxn(ObjectStore.java:1700)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getPartitionNamesPrunedByExprNoTxn(ObjectStore.java:2003)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore.access$400(ObjectStore.java:146)
> at
> org.apache.hadoop.hive.metastore.ObjectStore$3.getJdoResult(ObjectStore.java:1937)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore$3.getJdoResult(ObjectStore.java:1909)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore$GetHelper.run(ObjectStore.java:2214)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsByExprInternal(ObjectStore.java:1909)
>
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsByExpr(ObjectStore.java:1882)
>
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