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Starting 4d1f0d4
.distinct
used inbuild_relation
(if joins present).DISTINCT would fail when used on tables with json columns (PostgreSQL have no equality operator for type json).
Example:
ERROR: could not identify an equality operator for type json LINE 1: SELECT DISTINCT "users".* FROM ...
Looks like this is regression, so added spec to cover this case.
This PR intentionally fails (TravisCI) on develop branch for postgresql adapter (due to regression).