bug: explain update sql panic

[b41sh]

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• I had searched in the issues and found no similar issues.

Version

main

What's Wrong?

explain update sql panic
this bug is found by Tidb test

panicked at src/query/sql/src/executor/physical_plans/physical_mutation_source.rs:103:60:
called `Option::unwrap()` on a `None` value

How to Reproduce?

root@0.0.0.0:48000/default> EXPLAIN ANALYZE UPDATE t SET a = 2 WHERE a = 1;
error: APIError: QueryFailed: [1104]called `Option::unwrap()` on a `None` value

root@0.0.0.0:48000/default> EXPLAIN UPDATE t SET a = 2;
error: APIError: QueryFailed: [1104]called `Option::unwrap()` on a `None` value

Are you willing to submit PR?

• Yes I am willing to submit a PR!