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11-Aug-2020 21:53

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Description: When doing this query on the supplied test-table, the result of the AVG's are wrong: SELECT 7406, AVG(runtime) FROM test2 WHERE testrun_id = 7406 UNION SELECT 7499, AVG(runtime) FROM test2 WHERE testrun_id = 7499 The result is: 7406 10000.000000000000000000 7499 10000.000000000000000000 While it should be: 7406 13558.794316406250800355 7499 14373.432968749999417923 With only 10 records per testrun its ok.How to repeat: Load the attached table and do the above query ; ------ -------------------------- | 7406 | AVG(runtime) | ------ -------------------------- | 7406 | 10000.000000000000000000 | | 7499 | 10000.000000000000000000 | ------ -------------------------- 2 rows in set (0.08 sec) mysql show create table test2\G *************************** 1.The application refers to the user interface and all components in Avast Antivirus.Updates to the application provide bug fixes and general improvements.The proxy settings section is for users who connect to the internet through a proxy server.

We strongly recommend you keep automatic updates enabled.#3: AVG function does not update max_length (display length) when updating number of decimals.#4: The function that switches to non-fixed number of significant digits should use DBL_DIG 2 or FLT_DIG 2 as cut-off values (Since fixed precision does not use the 'e' notation) Of these points, #1 is the controversial one, but this change is preferred and has been cleared with Monty.FLOAT or DOUBLE), My SQL will always try to maintain exact precision, and if that is not possible (there are hardware limits, since FLOAT and DOUBLE are stored as approximate values) will switch to using approximate values.

The problem here is that at this point the information about number of significant digits is not available.

row *************************** Table: test2 Create Table: CREATE TABLE `test2` ( `testrun_id` smallint(5) unsigned NOT NULL default '0', `runtime` float(20,14) default NULL ) ENGINE=My ISAM DEFAULT CHARSET=latin1 1 row in set (0.00 sec) mysql ; ------ -------------------------- | 7406 | AVG(runtime) | ------ -------------------------- | 7406 | 13558.794316406250000000 | | 7499 | 14373.432968750000000000 | ------ -------------------------- 2 rows in set (0.02 sec) mysql I'm sorry for reopening this bug, but I forgot to mention something pretty important: When doing the seperate queries (SELECT 7406, AVG(runtime) FROM test2 WHERE testrun_id = 7406 and with 7499) the results are just fine, so mysql *can* produce correct results from those lists of float's. Your My SQL connection id is 4 Server version: 5.0.34-debug Source distribution Type 'help;' or '\h' for help. mysql WHERE testrun_id = 7406; ------ -------------------------- | 7406 | AVG(runtime) | ------ -------------------------- | 7406 | 13558.794316406250800355 | ------ -------------------------- 1 row in set (0.26 sec) mysql WHERE testrun_id = 7499; ------ -------------------------- | 7499 | AVG(runtime) | ------ -------------------------- | 7499 | 14373.432968749999417923 | ------ -------------------------- 1 row in set (0.01 sec) mysql WHERE testrun_id = 7499; ------ -------------------------- | 7406 | AVG(runtime) | ------ -------------------------- | 7406 | 10000.000000000000000000 | | 7499 | 10000.000000000000000000 | ------ -------------------------- 2 rows in set (0.10 sec)A patch for this bug has been committed.