difin commented on code in PR #5792:
URL: https://github.com/apache/hive/pull/5792#discussion_r2082259745
##########
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/compaction/IcebergQueryCompactor.java:
##########
@@ -96,16 +106,46 @@ public boolean run(CompactorContext context) throws
IOException, HiveException,
throw new HiveException(ErrorMsg.COMPACTION_NO_PARTITION);
}
} else {
- long partitionHash = IcebergTableUtil.getPartitionHash(icebergTable,
partSpec);
+ Pair<Integer, StructProjection> partSpecPair =
+ IcebergTableUtil.getPartitionSpecIdAndStruct(icebergTable, partSpec);
Review Comment:
> why can't we do this directly on FILES table?
Because we need to know the values that need to be used in the
`named_struct`, but IcebergQueryCompactor gets partition name in the human
readable format and partition values needs to be retrieved and converted.
An example from existing Iceberg compaction q-test:
- we compact a table with partition spec:`spec(truncate(3, event_src),
month(event_time))`.
- IcebergQueryCompactor gets `ci.partName` =
`event_src_trunc=BBB/event_time_month=2024-08`.
- The query on the `files` table needs to be `select FILE_PATH from
default.ice_orc.files where `partition` =
named_struct("event_src_trunc","AAA",event_time_month,655);`
event_time_month value `2024-08` is a human readable format it cannot be
used as is in the query on files metadata table, it needs to be converted to
`655`.
To do that I am listing `partitions` table to find the` spec id` and
partition struct for the given `ci.partName` and applying conversions to get
the values that can be used in the condition on `partition` field from `files`
metatable.
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