Server: Optimized the getBy and countBy methods

changing the transaction_inputs and transaction_outputs tables for address_transaction_details table which is indexed

server/app/com/xsn/explorer/data/anorm/dao/TransactionPostgresDAO.scala

@@ -94,29 +94,15 @@ class TransactionPostgresDAO @Inject() (fieldOrderingSQLInterpreter: FieldOrderi
 
     val orderBy = fieldOrderingSQLInterpreter.toOrderByClause(ordering)
 
-    /**
-     * TODO: The query is very slow while aggregating the spent and received values,
-     *       it might be worth creating an index-like table to get the accumulated
-     *       values directly.
-     */
     SQL(
       s"""
-        |SELECT t.txid, blockhash, time, size,
+         |SELECT t.txid, t.blockhash, t.time, t.size, a.sent, a.received
-        |       (SELECT COALESCE(SUM(value), 0) FROM transaction_inputs WHERE txid = t.txid AND address = {address}) AS sent,
+         |FROM transactions t
-        |       (SELECT COALESCE(SUM(value), 0) FROM transaction_outputs WHERE txid = t.txid AND address = {address}) AS received
+         |INNER JOIN address_transaction_details a USING (txid)
-        |FROM transactions t
+         |WHERE a.address = {address}
-        |WHERE t.txid IN (
+         |$orderBy
-        |  SELECT txid
+         |OFFSET {offset}
-        |  FROM transaction_inputs
+         |LIMIT {limit}
-        |  WHERE address = {address}
-        |) OR t.txid IN (
-        |  SELECT txid
-        |  FROM transaction_outputs
-        |  WHERE address = {address}
-        |)
-        |$orderBy
-        |OFFSET {offset}
-        |LIMIT {limit}
       """.stripMargin
     ).on(
       'address -> address.string,
@@ -128,17 +114,9 @@ class TransactionPostgresDAO @Inject() (fieldOrderingSQLInterpreter: FieldOrderi
   def countBy(address: Address)(implicit conn: Connection): Count = {
     val result = SQL(
       """
-        |SELECT COUNT(*)
+        |  SELECT COUNT(*)
-        |FROM transactions
+        |  FROM address_transaction_details
-        |WHERE txid IN (
-        |  SELECT txid
-        |  FROM transaction_inputs
-        |  WHERE address = {address}
-        |) OR txid IN (
-        |  SELECT txid
-        |  FROM transaction_outputs
         |  WHERE address = {address}
-        |)
       """.stripMargin
     ).on(
       'address -> address.string