codope opened a new pull request, #7527:
URL: https://github.com/apache/hudi/pull/7527
### Change Logs
Fetching virtual key involved reading from commit metadata or data file
(`TableSchemaResolver`) which is a costly operation. This is only needed for
schema projection in the case of MOR table (realtime splits). So, we can avoid
it in case of COW table.
### Impact
Improves performance of hive-compatible query engines that depend on input
format implementation in Hudi, e.g. trino-hive connector. Tested listing on a
TPC-DS table with 1824 partitions.
Without this change (1.5 minutes):
```
trino:default> select count(*) from store_sales;
_col0
---------
2750311
(1 row)
Query 20221221_054403_00003_t63mx, FINISHED, 1 node
Splits: 1,832 total, 1,832 done (100.00%)
1:29 [2.75M rows, 28.5MB] [30.8K rows/s, 327KB/s]
```
With this change (18 seconds):
```
trino:default> select count(*) from store_sales;
_col0
---------
2750311
(1 row)
Query 20221221_055625_00002_knx5g, FINISHED, 1 node
Splits: 1,832 total, 1,832 done (100.00%)
17.30 [2.75M rows, 28.5MB] [169K rows/s, 1.75MB/s]
```
### Risk level (write none, low medium or high below)
medium
### Documentation Update
_Describe any necessary documentation update if there is any new feature,
config, or user-facing change_
- _The config description must be updated if new configs are added or the
default value of the configs are changed_
- _Any new feature or user-facing change requires updating the Hudi website.
Please create a Jira ticket, attach the
ticket number here and follow the
[instruction](https://hudi.apache.org/contribute/developer-setup#website) to
make
changes to the website._
### Contributor's checklist
- [ ] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [ ] Change Logs and Impact were stated clearly
- [ ] Adequate tests were added if applicable
- [ ] CI passed
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