ScanRows doesn't reset fields in target struct for incoming null values #6819
Description
GORM Playground Link
Description
Starting with gorm v1.25.1 (v1.25.0 was not affected), if I use ScanRows on a struct that is not initialized to its default value for all fields GORM will not overwrite those fields that are NULL on SQL side.
An example codpiece can be found at go-gorm/playground#686, but generally speaking we have encountered it when using a non-builtin type too (https://github.com/shopspring/decimal).