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8d50ec772c
expr_lst: expr_lst sub_expr wrapped the expression list parsed so far in a newly created FTS_AST_LIST for every sub-expression, so a query such as '(word)' repeated N times built N nested lists. fts_ast_visit() recurses once per FTS_AST_LIST and overflowed the thread stack; the default thread_stack was exhausted at about 2300 repetitions. Append the sub-expression to the list that is already being built, and create a list only when there is none yet, the way the neighbouring expr_lst: expr_lst expr rule has always done. The sub-expressions now become siblings of a single list and the depth no longer grows. This also corrects '+term (subexpr)'. The FTS_EXIST pass used to run to completion in the inner list before the sub-expression was unioned at the outer level, so rows that matched only the sub-expression were returned. Based on mysql/mysql-server@e46e9db484