Added types field to MutableResultSet. This will allow inferring the types of RowData fields, which can be useful in different situations, e.g. converting the results to json format

Author: Indraneel Mukherjee

db-async-common/src/main/scala/com/github/mauricio/async/db/general/MutableResultSet.scala

@@ -31,10 +31,12 @@ class MutableResultSet[T <: ColumnData](
   private val columnMapping: Map[String, Int] = this.columnTypes.indices.map(
     index =>
       ( this.columnTypes(index).name, index ) ).toMap
-    
+
 
   val columnNames : IndexedSeq[String] = this.columnTypes.map(c => c.name)
 
+  val types : IndexedSeq[Int] = this.columnTypes.map(c => c.dataType)
+
   override def length: Int = this.rows.length
 
   override def apply(idx: Int): RowData = this.rows(idx)
@@ -43,4 +45,4 @@ class MutableResultSet[T <: ColumnData](
     this.rows += new ArrayRowData(this.rows.size, this.columnMapping, row)
   }
 
-}
+}