[jira] [Created] (HUDI-3979) Make sure Hudi Relations are only fetching strictly required columns

["Alexey Kudinkin (Jira)" <ji...@apache.org>]

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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