unknownplan in execution plan for insert query

[shaoxiqian]

Bug Report

1. Minimal reproduce step (Required)

workload:web3bench

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

correct execution plan

4. What is your TiDB version? (Required)

v7.5.0

[YangKeao]

I don't think it's a bug of TiDB itself. If a plan (with foreign key check) is decoded on a TiDB with lower version, it may produce UnknownPlanID. Let me check how it happens and whether it's reproducible.

[YangKeao]

Close it because it cannot be produced for now. If anyone has a detailed procedure on how to reproduce it feel free to re-open this issue.