Improve support utf8mb4 by adding intermediate varchar 191 type #411
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The strange length of 191 puzzled me. I appreciate that the reason was described here. |
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InnoDB has a maximum index length of 767 bytes, so with utf8mb4 you can only store 191 characters. This means that when you subsequently add an index to the column you get a (not-so-obvious) MySQL-error.
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