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MDEV-18041 Database corruption after renaming a prefix-indexed column
This is a regression after MDEV-13671. The bug is related to key part prefix lengths wich are stored in SYS_FIELDS. Storage format is not obvious and was handled incorrectly which led to data dictionary corruption. SYS_FIELDS.POS actually contains prefix length too in case if any key part has prefix length. innobase_rename_column_try(): fixed prefixes handling Tests for prefixed indexes added too. Closes #1063
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