SNOW-925990 add logging for mapping resultset columns

lib/connection/result/result.js

@@ -101,6 +101,7 @@
     ColumnNamesCreator.addOverridenNamesForDuplicatedColumns(rowtype);
   }
 
+  Logger.getInstance().trace(`Mapping columns in resultset (total: ${numColumns})`);
   for (let index = 0; index < numColumns; index++) {
 
     // create a new column and add it to the columns array
@@ -113,6 +114,7 @@
       mapColumnNameToIndices[column.getName()] || [];
     mapColumnNameToIndices[column.getName()].push(index);
   }
+  Logger.getInstance().trace(`Finished mapping columns.`);
 
   // create chunks
   this._chunks = createChunks(