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https://issues.apache.org/jira/browse/HUDI-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raymond Xu updated HUDI-3979:
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Epic Link: HUDI-3249 (was: HUDI-1297)
> Make sure Hudi Relations are only fetching strictly required columns
> --------------------------------------------------------------------
>
> Key: HUDI-3979
> URL: https://issues.apache.org/jira/browse/HUDI-3979
> Project: Apache Hudi
> Issue Type: Bug
> Reporter: Alexey Kudinkin
> Assignee: Alexey Kudinkin
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 0.12.0
>
>
> In 0.11 we were able to considerably optimize data throughput for MOR tables
> in XXX: previously MOR table would read the whole table (full row with all
> columns) even for a simple `df.count()` query.
>
> This has been optimized to just fetch the _required_ columns for each
> table-type (COW/MOR). However, we can optimize this even further:
> # COW tables do not require _any columns at all_
> # MOR tables do required primary-key and pre-combine-key columns only when
> actual merging w/ updated records (from delta-log files) is performed.
> Otherwise, they could avoid reading even these cols.
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