fix(sqlite): fix json_array_length output type

[IamTossan]

fix json_array_length output type

related to

• feat(sqlite): add json_array_length fn #4479
• Add missing sqlite json/jsonb functions and operators #4366

[IamTossan]

@weiznich I believe this will complete the feature

[weiznich]

For json_array_lenght it's not required to unconditionally return a nullable value, as the only way to get a NULL return value is to pass in a NULL (not json null) value. Otherwise an integer is returned. That means if we know that the input value cannot be null, we also know that the output value cannot be null. That is exactly what the old signature already means.

[IamTossan]

For json_array_lenght it's not required to unconditionally return a nullable value, as the only way to get a NULL return value is to pass in a NULL (not json null) value. Otherwise an integer is returned. That means if we know that the input value cannot be null, we also know that the output value cannot be null. That is exactly what the old signature already means.

I just double-checked, that's correct, my bad