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Changing columns WITH/WITHOUT SYSTEM VERSIONING doens't require to read data at all. Thus it should be an instant operation. Patch also fixes a bug when ALTER_COLUMN_UNVERSIONED wasn't passed to InnoDB to change its internal structures. change_field_versioning_try(): apply WITH/WITHOUT SYSTEM VERSIONING change in SYS_COLUMNS for one field. change_fields_versioning_try(): apply WITH/WITHOUT SYSTEM VERSIONING change in SYS_COLUMNS for every changed field in a table. change_fields_versioning_cache(): update cache for versioning property of columns. |
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