tuples as keys; get underlyings list

index.ts

@@ -75,6 +75,18 @@ function countRowsInLmdb(){
   return db.getKeysCount();
 }
 
+function getUnderlyingsSet(){
+  const underlyings = new Set();
+  db.getKeys({start:['A']}).forEach(([underlying])=>{
+    underlyings.add(underlying);
+  });
+  return underlyings
+}
+
 //console.log('rows-in-csv:', await countRowsInCsv());
 //console.log('rows-in-lmdb:', countRowsInLmdb());
-await ingestCsvToLmdb();
+//await ingestCsvToLmdb();
+for(let key in getUnderlyingsSet().values()){ 
+  console.log(key);
+}
+Array.from(getUnderlyingsSet().values()).forEach((x)=>{ console.log(x) })