Make SqlColumn Extensible #996
Merged
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With this PR it is now possible to write a subclass for SqlColumn. This is more challenging than you might expect because many methods in SqlColumn create new instances of the class - so we need to provide a method for making new instances of the extended class. I've tried to make this as simple as possible and have provided a simple example.
Please see the JavaDoc in SqlColumn for detailed instructions, and see the test code for an example of a properly extended class.
Resolves #992