suxiaogang223 opened a new pull request, #68321:
URL: https://github.com/apache/doris/pull/68321
### What problem does this PR solve?
JDBC Catalog currently decides whether a MySQL-compatible endpoint is Doris
by parsing `version_comment`. That value is display text and may change with
product branding or packaging. When the expected marker is absent, the endpoint
is treated as MySQL and Doris-specific types can be mapped incorrectly.
This change exposes a stable, read-only `doris_server_identity` session
variable with the value `apache_doris`. Both JDBC client implementations probe
this variable first and use exact identity matching. If the remote endpoint
does not expose the variable, they fall back to the existing `version_comment`
detection so older endpoints remain compatible.
The compatibility adjustment for existing enterprise version comments
remains a separate commit, allowing it to be reviewed or applied independently.
### Release note
Use a stable server identity when detecting Doris JDBC endpoints, with
backward-compatible fallback for older endpoints.
### Check List (For Author)
- Test: Unit Test
- `./run-fe-ut.sh --run
org.apache.doris.datasource.jdbc.client.JdbcMySQLClientTest,org.apache.doris.connector.jdbc.client.JdbcMySQLConnectorClientTest`
- Both test classes passed: 4 tests total, 0 failures, 0 errors, 0
skipped
- FE build, checkstyle, and metadata funnel checks passed as part of the
test command
- Behavior changed: Yes. JDBC Catalog prefers the stable server identity and
falls back to the existing version comment probe when the identity variable is
unavailable.
- Does this need documentation: No
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