False positive for incompatible schema change on non-ff merge when indexes on overlapping columns exist
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Description
This happens on any non-fast-forward merge when there is more than one index defined on the same column. Repro here:
https://github.com/dolthub/dolt/pull/8821
MySQL considers `UNIQUE` constraints distinct from indexes and allows you to create an index and a unique key on the same column, so we have to support this kind of schema.
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