Alexey Kudinkin created HUDI-3979:
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Summary: 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
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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