suxiaogang223 opened a new pull request, #64472:
URL: https://github.com/apache/doris/pull/64472
### What problem does this PR solve?
Issue Number: None
Related PR: #64389
Problem Summary: Pick #64389 to branch-4.0. JDBC catalog initializes the
MySQL client as a plain MySQL-compatible target unless the remote
version_comment contains the word Doris. Doris-compatible deployments can
expose version comments such as SelectDB, VeloDB, or enterprise cloud strings,
so Doris-specific column type overrides are skipped. As a result, Doris complex
types reported through MySQL metadata can be mapped as scalar MySQL types and
fail during scan. This pick recognizes Doris-compatible version comments and
keeps using the existing SHOW FULL COLUMNS based type override path.
Note: branch-4.0 does not have the newer fe-connector-jdbc module from
master, so this manual pick keeps only the existing fe-core JDBC client and
unit test changes.
### Release note
Fix JDBC catalog type mapping for Doris-compatible MySQL endpoints whose
version_comment does not contain Doris.
### Check List (For Author)
- Test: Unit Test
- ./run-fe-ut.sh
org.apache.doris.datasource.jdbc.client.JdbcMySQLClientTest
- Behavior changed: Yes. JDBC MySQL catalog now treats SelectDB, VeloDB, and
enterprise cloud version comments as Doris-compatible for column type mapping.
- Does this need documentation: No
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