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Minor: add runtime asserts to `RowGroup`
Which issue does this PR close?
Follow on to https://github.com/apache/datafusion/pull/10607/
Rationale for this change
@advancedxy noted https://github.com/apache/datafusion/pull/10607/files#r1611810009 that there was an assumption that was not programatically validated
What changes are included in this PR?
Add assert to ensure the assumption is correct