Relax backfill requirements so it works with unique columns #288
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UNIQUE NOT NULL columns should also work in order to perform backfills. This change relaxes the check on backfill requirements to use those columns if a primary key is not available.
Validation will still error out if no suitable column is found
Note: this also fixes the
unique
retrieval from schema, where we were failing to understand composed unique indices, resulting in columns flagged as unique where they weren't really unique.