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Use in_sum_func (and so nest_level) only in LEX to which SELECT lex belong to Reduce usage of current_select (because it does not always point on the correct SELECT_LEX, for example with prepare. Change context for all classes inherited from Item_ident (was only for Item_field) in case of pushing down it to HAVING. Now name resolution context have to have SELECT_LEX reference if the context is present. Fixed feedback plugin stack usage.