starocean999 opened a new pull request, #64363:
URL: https://github.com/apache/doris/pull/64363
Problem Summary:
In a multi-FE environment, when a CREATE TABLE AS SELECT with recursive CTE
is forwarded from a follower FE to the master FE, the execution fails with
"fragment has no children".
Root Cause:
In the proxy flow (ConnectProcessor.proxyExecute() →
StmtExecutor(ConnectContext, OriginStatement, boolean)), the StatementContext
is created fresh without a parsedStatement. When parseByNereids() later parses
the SQL, it only sets this.parsedStmt on the StmtExecutor but did not propagate
it to the ConnectContext's StatementContext.
This caused SessionVariable.canUseNereidsDistributePlanner() to return false
(because statementContext.getParsedStatement() instanceof LogicalPlanAdapter
checked against null), which led to two consequences:
NereidsPlanner.distribute() skipped generating Nereids distributed plans
EnvFactory.createCoordinator() created a legacy Coordinator instead of
NereidsCoordinator
The legacy Coordinator cannot handle Nereids-planned fragments without
distributed plans, resulting in "fragment has no children" at
Coordinator.findMaxParallelFragmentIndex().
Fix:
In StmtExecutor.parseByNereids(), after parsing the SQL, propagate the
parsed statement to the ConnectContext's StatementContext via
this.context.getStatementContext().setParsedStatement(parsedStmt). This ensures
consistency with what downstream code (canUseNereidsDistributePlanner) reads.
### 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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