Reference to column in find/get methods

[mabar]

It would be great to be able reference other columns in filtering. I would like something like:

• 'column1' => new ColumnReference('column2') - column1 = column2
• 'column1!=' => new ColumnReference('column2') - column1 != column2

Bit problematic are cases like position = rating + 1 . In this case we are limited by operators being written in key:

• 'position+1' => new ColumnReference('rating') ??

I think best in long-term would be to move comparison from key to value:

• 'column1' => new ColumnReference('column2') - implicit =
• 'column1' => new EqualWith(new ColumnReference('column2')) - explicit =
• 'column1' => new NotEqualWith(new ColumnReference('column2')) - explicit !=
• 'position' => new Sum(new ColumnReference('rating'), 1) - explicit +