infer_unique_index() style tweaks
Tests: ON CONFLICT with UPDATE must contain columns or expressions to infer a unique index from
Fix whitespace issue
Test partial unique index inference
Comments reflecting new approach to alt equals operators
comments on inference clause parse analysis
Restate comments on auxiiary query seeing parent's RTE
Arbiter index, not arbitration index (code)
Tests: Arbiter index, not arbitration index
Note on EXPLAIN alias thing
Better discussion of new serialization failures