HappenLee opened a new pull request, #68377:
URL: https://github.com/apache/doris/pull/68377
### What problem does this PR solve?
Issue Number: None
Related PR: #68374, #63389, #65263
Problem Summary:
On branch-4.1, sessions currently default to `min_scanners_concurrency = 1`
and `enable_expr_zonemap_filter = false`. Set these defaults to `4` and `true`,
respectively, and update the English and Chinese session-variable descriptions.
This enables the existing expression ZoneMap filtering path by default and
raises the minimum scanner concurrency under the existing scanner-count,
concurrency and memory limits. Serial scans continue to use one scanner. Both
variables remain configurable through the existing session/global settings and
are already forwarded to BE.
### Release note
Enable expression ZoneMap filtering by default and increase the default
`min_scanners_concurrency` from `1` to `4`.
### Check List (For Author)
- Test: FE unit tests and Checkstyle passed.
- `MAVEN_ARGS='-T 48' bash run-fe-ut.sh --run
org.apache.doris.qe.SessionVariablesTest,org.apache.doris.qe.VariableMgrTest`:
29 tests, 0 failures/errors/skips.
- `mvn -T 48 checkstyle:check -pl fe-core` (from `fe/`): 0 violations.
- `git diff --check`: passed.
- Behavior changed: Yes. The two session defaults change as described above.
- Does this need documentation: No. Both session-variable descriptions are
updated.
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