morningman opened a new pull request, #61050:
URL: https://github.com/apache/doris/pull/61050
### What problem does this PR solve?
Issue Number: close #60634
Problem Summary:
When using MySQL Connector/J 9.5.0+ with useServerPrepStmts=true, queries
return empty result sets. This is caused by a behavior change in the driver's
BinaryResultsetReader that no longer consumes the intermediate EOF packet after
column definitions when no cursor exists.
The fix properly implements the CLIENT_DEPRECATE_EOF capability:
1. Advertise CLIENT_DEPRECATE_EOF in server handshake capability flags
(MysqlCapability.java), so the driver negotiates it and uses the
isEOFDeprecated()=true code path, bypassing the buggy 9.5.0 logic.
2. Skip intermediate EOF packets after column definitions when
CLIENT_DEPRECATE_EOF is negotiated (StmtExecutor.sendMetaData, sendFields,
sendStmtPrepareOK).
3. Send a 'ResultSet OK' packet (0xFE header, payload > 5 bytes) as the
final end-of-result-set marker instead of the traditional EOF packet, so the
driver's isResultSetOKPacket() correctly identifies it
(MysqlResultSetEndPacket.java, ConnectProcessor.getResultPacket).
4. Always write the info field in MysqlOkPacket (even when empty) to prevent
ArrayIndexOutOfBoundsException when the driver parses OK packets via
OkPacket.parse() which unconditionally reads STRING_LENENC.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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