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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2018/12/25 12:55:42 UTC
[GitHub] xueyumusic commented on issue #6445: [FLINK-8302] [table] Add
SHIFT_LEFT and SHIFT_RIGHT
xueyumusic commented on issue #6445: [FLINK-8302] [table] Add SHIFT_LEFT and SHIFT_RIGHT
URL: https://github.com/apache/flink/pull/6445#issuecomment-449848378
hi, @pnowojski , I compared different kinds of params type with java operators(<<, >>, >>>), hive, pg9.6 and mysql. It looks java operators, hive and pg9.6 behave the same for these cases(first param negative, second param negative etc). So I think aligning with java operators in code gen is reasonable.
For param type, hive uses the way that if first param is tinyint/smallint/int then return value is int and if first param is bigint(long) then return value is bigint(long). Thanks @twalthr @pnowojski
| java | hive | pg9.6 | mysql
-- | -- | -- | -- | --
3<<-1 | -2147483648 | -2147483648 | -2147483648 | 0
4<<-1 | 0 | 0 | 0 | 0
5<<-1 | -2147483648 | -2147483648 | -2147483648 | 0
6<<-1 | 0 | 0 | 0 | 0
7<<-1 | -2147483648 | -2147483648 | -2147483648 | 0
5<<-2 | 1073741824 | 1073741824 | 1073741824 | 0
6<<-2 | -2147483648 | -2147483648 | -2147483648 | 0
5<<-3 | -1610612736 | -1610612736 | -1610612736 | 0
6<<-3 | -1073741824 | -1073741824 | -1073741824 | 0
-2<<1 | -4 | -4 | -4 | 1.84E+19
-5<<2 | -20 | -20 | -20 | 1.84E+19
-6<<-1 | 0 | 0 | 0 | 0
-7<<-1 | -2147483648 | -2147483648 | -2147483648 | 0
32>>-1 | 0 | 0 | 0 | 0
4>>-1 | 0 | 0 | 0 | 0
5>>-1 | 0 | 0 | 0 | 0
-2>>1 | -1 | -1 | -1 | 9.22E+18
-32>>1 | -16 | -16 | -16 | 9.22E+18
-5>>2 | -2 | -2 | -2 | 4.61E+18
-64>>-1 | -1 | -1 | -1 | 0
-7>>-1 | -1 | -1 | -1 | 0
-2>>>1 | 2147483647 | 2147483647 | |
-32>>>1 | 2147483632 | 2147483632 | |
-4>>>2 | 1073741823 | 1073741823 | |
-5>>>2 | 1073741822 | 1073741822 | |
-64>>>-1 | 1 | 1 | |
-7>>>-1 | 1 | 1 | |
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