Error 1089: Incorrect prefix key; the used key part isn't a string, the used length is longer than t

Error Code	SQLSTATE	Error	Description
1089	HY000	ER_WRONG_SUB_KEY	Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique prefix keys

Possible Causes and Solutions

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