76a39f2295
Commit 29b64d1d mishandled skipping over truncated high key attributes during row comparisons. The row comparison key matching loop would loop forever when a truncated attribute was encountered for a row compare subkey. Fix by following the example of other code in the loop: advance the current subkey, or break out of the loop when the last subkey is reached. Add test coverage for the relevant _bt_check_rowcompare() code path. The new test case is somewhat tied to nbtree implementation details, which isn't ideal, but seems unavoidable.
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