Finding Intersection?
Hi,
I have the following 2 objects:
{'a': '1', 'b': '1', 'c': '1', 'd': '1'}
{'b': '1', 'd': '1'}
And I would like to find the intersection between them. I could not find a way to do that. I could only find JSON_CONTAINS which just checks for a value.
I found this (https://stackoverflow.com/questions/44687872/find-intersection-of-mysql-json-objects-or-arrays) on Stackoverflow.com, but it's been like 3 years now. Isn't there going to be a native function for this?
Regards
Answer Answered by Daniel Black in this comment.
The main reason it wasn't implemented from the start is it wasn't part of the JSON SQL standard.
The JSON path language in section 6 rules out intersection as a goal however that doesn't preclude it being a function in section 5.
This also explains why attempting to use any function based on JSON path is very hard to make an intersection. With your sample it might be possible to do something with a JSON_TABLE and a JOIN between them and reform the expression in the result.
This looks like a reasonable request for a function, and I couldn't see this requested on JIRA so I recommend adding it as a MDEV task to implement.
There's no way we can use StackOverflow questions as a task list :-)
