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executor: fix forget to release session (#56299) #59481

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merged 1 commit into from
Feb 13, 2025
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executor: fix forget to release session (#56299) #59481

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14 changes: 2 additions & 12 deletions executor/simple.go
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Original file line number Diff line number Diff line change
Expand Up @@ -142,16 +142,6 @@ func (e *baseExecutor) releaseSysSession(ctx context.Context, sctx sessionctx.Co
sysSessionPool.Put(sctx.(pools.Resource))
}

// clearSysSession close the session does not return the session.
// Since the environment variables in the session are changed, the session object is not returned.
func clearSysSession(ctx context.Context, sctx sessionctx.Context) {
if sctx == nil {
return
}
_, _ = sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, "rollback")
sctx.(pools.Resource).Close()
}

// Next implements the Executor Next interface.
func (e *SimpleExec) Next(ctx context.Context, req *chunk.Chunk) (err error) {
if e.done {
Expand Down Expand Up @@ -1692,10 +1682,10 @@ func (e *SimpleExec) executeAlterUser(ctx context.Context, s *ast.AlterUserStmt)
}

sysSession, err := e.getSysSession()
defer clearSysSession(ctx, sysSession)
if err != nil {
return err
}
defer e.releaseSysSession(ctx, sysSession)
sqlExecutor := sysSession.(sqlexec.SQLExecutor)
// session isolation level changed to READ-COMMITTED.
// When tidb is at the RR isolation level, executing `begin` will obtain a consistent state.
Expand Down Expand Up @@ -2389,10 +2379,10 @@ func userExistsInternal(ctx context.Context, sqlExecutor sqlexec.SQLExecutor, na
func (e *SimpleExec) executeSetPwd(ctx context.Context, s *ast.SetPwdStmt) error {
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnPrivilege)
sysSession, err := e.getSysSession()
defer clearSysSession(ctx, sysSession)
if err != nil {
return err
}
defer e.releaseSysSession(ctx, sysSession)

sqlExecutor := sysSession.(sqlexec.SQLExecutor)
// session isolation level changed to READ-COMMITTED.
Expand Down