Property based query testing

Given the same data, schema, the same query against two different table configurations should always produce the same result. Generating table configurations over a schema and checking this invariant for generated random data would help to find bugs in operators and index implementations.

The issue does not name files or tests; begin by locating tests for query operators and index implementations. Define generated table configurations over a schema and random data, then check that the same query returns the same result across configurations.

Written by the indexing model from the issue text.