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34
:var(var_arg), var_type(var_type_arg), component(*component_arg)
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/* set_name() will allocate the name */
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Item_func_get_system_var::fix_fields(Session *session, Item **ref)
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Evaluate the system variable and substitute the result (a basic constant)
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instead of this item. If the variable can not be evaluated,
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the error is reported in sys_var::item().