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e03bb5986e
The bug could be reproduced as follows: Define a table so that the first column of the clustered index is a VARCHAR or a UTF-8 CHAR in a collation where sequences of bytes of differing length are considered equivalent. Insert and delete a record. Before the delete-marked record is purged, insert another record whose first column is of different length but equivalent to the first record. Under certain conditions, the insertion can be incorrectly performed as update-in-place. Likewise, an operation that could be done as update-in-place can unnecessarily be performed as delete and insert, but that would not cause corruption but merely degraded performance.