table/tables: fix load partition when upgrade from an old TiDB (#17971) #17983
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cherry-pick #17971 to release-4.0
What problem does this PR solve?
Issue Number: close #17952
Problem Summary:
In the old version TiDB, partition definition store the less than XXX as raw expression.
It should be integer, the new version TiDB assert XXX is an integer.
What is changed and how it works?
What's Changed:
Add some code to handle compatibility.
How it Works:
If the less than expression is not an integer, try to parser it as expression and calculate the integer.
Related changes
Check List
Tests
I have manually test the binary with issue #17952 and it works.
Side effects
Ugly code
Release note