ddl: Exchange part schema load fix (#46126) #46193
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This is an automated cherry-pick of #46126
What problem does this PR solve?
Issue Number: ref #46125 close #45791
Problem Summary:
What is changed and how it works?
Check List
Tests
Manual test:
Build this PR and use it for starting a cluster
tiup playground --db.binpath ./bin/tidb-server
and then run tiflash test
sh run-test.sh fullstack-test2/ddl/alter_exchange_partition.test
which no longer failsAlso check the tidb.log that there are no failures loading new schema diffs, so no full schema reloads are needed.
Side effects
Documentation
Release note
Please refer to Release Notes Language Style Guide to write a quality release note.
(Unless 7.4 get released without this fix).