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MDEV-23999 Potential stack overflow in InnoDB fulltext search
fts_query_t::nested_sub_exp: Keep track of nested fts_ast_visit_sub_exp() calls. fts_ast_visit_sub_exp(): Return DB_OUT_OF_MEMORY if the maximum recursion depth is exceeded. This is motivated by a change in MySQL 5.6.50: mysql/mysql-server@e2a46b4 Bug #29929684 USING MANY NESTED ARGUMENTS WITH BOOLEAN FTS CAN LEAD TO TERMINATE SERVER
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