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HIVE-27991: Utilise FanoutWriters when inserting records in an Iceberg table when the records are unsorted - #4988
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…g table when the records are unsorted
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…g table when the records are unsorted (apache#4988) (Sourabh Badhya reviewed by Butao Zhang)
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…g table when the records are unsorted (apache#4988) (Sourabh Badhya reviewed by Butao Zhang)
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What changes were proposed in this pull request?
Utilise FanoutWriters when inserting records in an Iceberg table when the records are unsorted
Why are the changes needed?
FanoutWriter is a writer in Iceberg which can be used to write records in a table. This writer keeps all the file handles open, until the write is finished. FanoutWriters is used as the writer when the incoming records are unsorted. We can by default have some mechanism to switch to using FanoutWriters instead of ClusteredWriters when custom sort expressions are not present for the given table/query.
Similar stuff is already implemented in Spark - apache/iceberg#8621
Does this PR introduce any user-facing change?
No
Is the change a dependency upgrade?
No
How was this patch tested?
QTests