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Alexander Nozdrin authored
(SUBSTRING inside a stored function works too slow). Background: - THD classes derives from Query_arena, thus inherits the 'state' attribute and related operations (is_stmt_prepare() & co). - Although these operations are available in THD, they must not be used. THD has its own attribute to point to the active Query_arena -- stmt_arena. - So, instead of using thd->is_stmt_prepare(), thd->stmt_arena->is_stmt_prepare() must be used. This was the root cause of Bug 60025. This patch enforces the proper way of calling those operations. is_stmt_prepare() & co are declared as private operations in THD (thus, they are hidden from being called on THD instance). The patch tries to minimize changes in 5.5.
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