json: implement json unary not with comparing to json(0)

[YangKeao]

Signed-off-by: YangKeao [email protected]

What problem does this PR solve?

Issue Number: close #40683

Problem Summary:

The behavior of unary not for json value is different between TiDB and MySQL. TiDB converts the json to double and run unary not on it. MySQL compares the JSON with json integer 0.

What is changed and how it works?

I changed the behavior to be compatible with MySQL. The only concern is that I don't know whether returning a function in other function class is expected. I only noticed the funcName is different so I added a very ugly condition to overwrite the funcName, but I'm not sure whether it will have other problems (at least, I cannot overwrite the funcName for the caller...).

Or anyone can provide better idea?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Release note

Fix the issue that unary not with comparing to json(0) is not compatible with MySQL.

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[xiongjiwei]

why not like the other type, add a new sig builtinUnaryNotJSONSig

[YangKeao]

Good. I also agree add a new sig builtinUnaryNotJSONSig is better 🤝

[YangKeao]

I'll add a new builtinUnaryNotJSONSig, but not using the eq directly.