JSON NULL handling
Posted by: Philippe Riand
Date: October 29, 2018 06:54PM

Looks like JSON null handling changed, as some of our code using MySQL 8 from last year doesn't work anymore with the latest 8.0.13. Not sure what version broke it though.

It looks like a JSON value of 'null' is not returned as 'NULL' anymore. See the sample SQL bellow, easy to reproduce from the workbench:

SET @doc = JSON_OBJECT('a', NULL);
SELECT JSON_UNQUOTE(JSON_EXTRACT(@doc,"$.a")) as C1,
JSON_UNQUOTE(JSON_EXTRACT(@doc,"$.b")) as C2;

C2 is effectively set as NULL, but C1 is returned as the 4 char 'null' string.

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