// Get the ColumnSet, which should only have one entry
PredicatePairs cset = e.getAttribute(EdgeAttributes.COLUMNSET);
assertNotNull(cset);
assertEquals(cset.toString(), 1, cset.size());
CatalogPair entry = cset.get(0);
assertNotNull(entry);
// Get the element from the entry that is not our column
CatalogType other = entry.getOther(catalog_col);
assertNotNull(other);
if ((other instanceof Column) == false) continue;
Column other_col = (Column)other;
System.err.println(String.format("catalog_col=%s, other_tbl=%s, other_col=%s",
catalog_col.fullName(), other_tbl.fullName(), other_col.fullName()));