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parse negative numbers into one item
use Item->neg to convert generate negative Item_num's instead of Item_func_neg(Item_num). Based on the following commit: Author: Monty <monty@mariadb.org> Date: Mon May 30 22:44:00 2016 +0300 Make negative number their own token The negation (-) operator will call Item->neg() one underlying numeric constants and remove itself (like the NOT() function does today for other NOT functions. This simplifies things - -1 is not anymore an expression but a basic_const_item - improves optimizer - DEFAULT -1 doesn't need special handling anymore - When we add DEFAULT expressions, -1 will be treated exactly like 1 - printing of items doesn't anymore put braces around all negative numbers Other things fixed: - Fixed that longlong converted to decimal's has a more appropriate size - Fixed that "-0.0" read into a decimal is interpreted as 0.0
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