presto-main/src/main/java/io/prestosql/sql/planner/optimizations/UnaliasSymbolReferences.java/UnaliasSymbolReferences/canonicalizeIndexJoinCriteria
class UnaliasSymbolReferences:        private List<IndexJoinNode.EquiJoinClause> canonicalizeIndexJoinCriteria(List<IndexJoinNode.EquiJoinClause> criteria)
        {
            ImmutableList.Builder<IndexJoinNode.EquiJoinClause> builder = ImmutableList.builder();
            for (IndexJoinNode.EquiJoinClause clause : criteria) {
                builder.add(new IndexJoinNode.EquiJoinClause(canonicalize(clause.getProbe()), canonicalize(clause.getIndex())));
            }

            return builder.build();
        }