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MDEV-24823 Crash with invalid multi-table update of view in 2nd execution of SP
Before this patch mergeable derived tables / view used in a multi-table update / delete were merged before the preparation stage. When the merge of a derived table / view is performed the on expression attached to it is fixed and ANDed with the where condition of the select S containing this derived table / view. It happens after the specification of the derived table / view has been merged into S. If the ON expression refers to a non existing field an error is reported and some other mergeable derived tables / views remain unmerged. It's not a problem if the multi-table update / delete statement is standalone. Yet if it is used in a stored procedure the select with incompletely merged derived tables / views may cause a problem for the second call of the procedure. This does not happen for select queries using derived tables / views, because in this case their specifications are merged after the preparation stage at which all ON expressions are fixed. This patch makes sure that merging of the derived tables / views used in a multi-table update / delete statement is performed after the preparation stage. Approved by Oleksandr Byelkin <sanja@mariadb.com>
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@ -1147,6 +1147,8 @@ public:
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bool save_leaf_tables(THD *thd);
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bool save_prep_leaf_tables(THD *thd);
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void set_unique_exclude();
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bool is_merged_child_of(st_select_lex *ancestor);
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/*
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