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MDEV-26583 SIGSEGV's in spider_get_select_limit_from_select_lex when DELAYED INSERT is used
Spider dereferences a freed select_lex and then results in SIGSEGV.
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@ -2423,6 +2423,11 @@ bool delayed_get_table(THD *thd, MDL_request *grl_protection_request,
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di->table_list.alias.str= di->table_list.table_name.str= di->thd.query();
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di->table_list.alias.length= di->table_list.table_name.length= di->thd.query_length();
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di->table_list.db= di->thd.db;
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/*
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Nulify select_lex because, if the thread that spawned the current one
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disconnects, the select_lex will point to freed memory.
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*/
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di->table_list.select_lex= NULL;
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/*
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We need the tickets so that they can be cloned in
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handle_delayed_insert
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