ddl: fix double/float data not being truncated for column modification operations when the number of decimal places is reduced. (#41555) #41593
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This is an automated cherry-pick of #41555
What problem does this PR solve?
Issue Number: close #41281
Problem Summary:
For operations that modify columns, double and float data should be truncated when the length is the same and the number of decimal places is reduced. But the old logic doesn't do it.
What is changed and how it works?
When the length is the same and the number of decimal places is reduced, we need reorg the data.
Check List
Tests
Side effects
Documentation
Release note
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