Expectation classes | Great Expectations

In our daily lives and our data, we expect different things from different types of objects. After all, it would be both alarming and disturbing if a chair suddenly behaved like a cat! Similarly, it is entirely reasonable to expect different results when we evaluate the contents of an entire table and when we evaluate the contents of a single column. Expectation classes have been created to help make sure Custom Expectations return the expected results. This document provides an overview of the available Expectation classes, why they are helpful, and when they should be used.