Unexpected "fail to generate plan info" warning log

[ekexium]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Run simple SQLs for sysbench schema
Not running anything

2. What did you expect to see? (Required)

3. What did you see instead (Required)

[adapter.go:1864] ["fail to generate plan info"] [backtrace="github.com/pingcap/tidb/pkg/executor.(*ExecStmt).SummaryStmt.func1.1\n\t/home/fedora/eke/tidb/pkg/executor/adapter.go:1865\ngithub.phpd.cn/pingcap/tidb/pkg/executor.(*ExecStmt).SummaryStmt.func1\n\t/home/fedora/eke/tidb/pkg/executor/adapter.go:1869\ngithub.phpd.cn/pingcap/tidb/pkg/util/stmtsummary.newStmtSummaryByDigestElement\n\t/home/fedora/eke/tidb/pkg/util/stmtsummary/statement_summary.go:652\ngithub.phpd.cn/pingcap/tidb/pkg/util/stmtsummary.(*stmtSummaryByDigest).add.func1\n\t/home/fedora/eke/tidb/pkg/util/stmtsummary/statement_summary.go:604\ngithub.phpd.cn/pingcap/tidb/pkg/util/stmtsummary.(*stmtSummaryByDigest).add\n\t/home/fedora/eke/tidb/pkg/util/stmtsummary/statement_summary.go:618\ngithub.phpd.cn/pingcap/tidb/pkg/util/stmtsummary.(*stmtSummaryByDigestMap).AddStatement\n\t/home/fedora/eke/tidb/pkg/util/stmtsummary/statement_summary.go:358\ngithub.phpd.cn/pingcap/tidb/pkg/util/stmtsummary/v2.Add\n\t/home/fedora/eke/tidb/pkg/util/stmtsummary/v2/stmtsummary.go:541\ngithub.phpd.cn/pingcap/tidb/pkg/executor.(*ExecStmt).SummaryStmt\n\t/home/fedora/eke/tidb/pkg/executor/adapter.go:1975\ngithub.phpd.cn/pingcap/tidb/pkg/executor.(*ExecStmt).FinishExecuteStmt\n\t/home/fedora/eke/tidb/pkg/executor/adapter.go:1363\ngithub.phpd.cn/pingcap/tidb/pkg/executor.(*ExecStmt).CloseRecordSet\n\t/home/fedora/eke/tidb/pkg/executor/adapter.go:1471\ngithub.phpd.cn/pingcap/tidb/pkg/executor.(*recordSet).Close\n\t/home/fedora/eke/tidb/pkg/executor/adapter.go:210\ngithub.phpd.cn/pingcap/tidb/pkg/session.(*execStmtResult).Close\n\t/home/fedora/eke/tidb/pkg/session/session.go:2374\ngithub.phpd.cn/pingcap/tidb/pkg/parser/terror.Call\n\t/home/fedora/eke/tidb/pkg/parser/terror/terror.go:315\ngithub.phpd.cn/pingcap/tidb/pkg/server/internal/resultset.(*tidbResultSet).Close\n\t/home/fedora/eke/tidb/pkg/server/internal/resultset/resultset.go:78\ngithub.phpd.cn/pingcap/tidb/pkg/server.(*clientConn).handleStmt\n\t/home/fedora/eke/tidb/pkg/server/conn.go:2055\ngithub.phpd.cn/pingcap/tidb/pkg/server.(*clientConn).handleQuery\n\t/home/fedora/eke/tidb/pkg/server/conn.go:1774\ngithub.phpd.cn/pingcap/tidb/pkg/server.(*clientConn).dispatch\n\t/home/fedora/eke/tidb/pkg/server/conn.go:1348\ngithub.phpd.cn/pingcap/tidb/pkg/server.(*clientConn).Run\n\t/home/fedora/eke/tidb/pkg/server/conn.go:1114\ngithub.phpd.cn/pingcap/tidb/pkg/server.(*Server).onConn\n\t/home/fedora/eke/tidb/pkg/server/server.go:739"] [error=null]

4. What is your TiDB version? (Required)

master (76133dc)