Publish a matrix of aggregates supported for column validations for different types

[sundar-mudupalli-work]

Hi,

DVT allows validations based on aggregates (min, max, sum etc) of different data types. We should publish the matrix of supported aggregates and what they mean so that users can interpret the results of validations.

Interesting facts:

1. When string columns are validated, DVT uses string length for min, max and sum aggregates
2. When timestampe columns are validated, DVT uses seconds since epoch for min, max and sum ?
3. Are min max validations supported across int and float columns ?

Sundar Mudupalli