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[C++] Support type promotion in basic evolution strategy #32988
Description
Most of the pieces are in place for this. If a fragment has int32 and the dataset schema is int64 for example then the basic evolution strategy should be able to safely cast.
We might even consider supporting unsafe casts like int64 -> int32 if we can detect overflow and raise an error.
Reporter: Weston Pace / @westonpace
Note: This issue was originally created as ARROW-17757. Please see the migration documentation for further details.
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thisisnic commentedon Sep 23, 2026
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