Your Question
If we wish to use a DBResolver for multiple Sources and multiple Replicas, do we need to provide a default dialector in the first gorm.Open() (to create a DB handle that the DBResolver will be registered to)?
The source code suggests that the dialector argument in gorm.Open() is optional, as it only assigns a Dialector if the input is not nil.
However, other parts of the source code require a default dialector, such as running an Exec() (source). If you try to do an Exec() without providing a dialector in the gorm.Open(), it panics with a nil pointer error.
The document you expected this should be explained
https://gorm.io/docs/dbresolver.html
Expected answer
If there are multiple Sources, then the concept of a "default" shouldn't apply. Things that currently assume there's a default dialector should use the same logic as connection pools to select an appropriate dialector.
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