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MariaDB inherits the MySQL limitation that ALGORITHM=INPLACE cannot create more than one FULLTEXT INDEX at a time. As part of the MDEV-11369 Instant ADD COLUMN refactoring, MariaDB 10.3.2 accidentally stopped enforcing the restriction. Actually, it is a bug in MySQL 5.6 and MariaDB 10.0 that an ALTER TABLE statement with multiple ADD FULLTEXT INDEX but without explicit ALGORITHM=INPLACE would return in an error message, rather than executing the operation with ALGORITHM=COPY. ha_innobase::check_if_supported_inplace_alter(): Enforce the restriction on multiple FULLTEXT INDEX. prepare_inplace_alter_table_dict(): Replace some code with debug assertions. A "goto error_handled" at this point would result in another error, because the reference count of ctx->new_table would be 0. |
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