Ability to have duplicate column names

This makes it easier to re-use stored procedures that have duplicate
column names for multi-mapping between Dapper and tedious. When the same
column is used multiple times, you can reference it with:
row['columnName'][index].value

Single occurence columns would still work with row['columnName'].value.
There might be a more intuitive way of references the duplicated column,
so I'm open to ideas there.

src/token/row-token-parser.coffee

@@ -1,29 +1,38 @@
-# s2.2.7.17
-
-valueParse = require('../value-parser')
-sprintf = require('sprintf').sprintf
-
-DIGITS_REGEX = /^\d+$/
-
-parser = (buffer, columnsMetaData) ->
-  columns = []
-  for columnMetaData in columnsMetaData
-    #console.log sprintf('Token @ 0x%02X', buffer.position)
-
-    value = valueParse(buffer, columnMetaData)
-
-    column =
-      value: value
-      metadata: columnMetaData
-
-    columns.push(column)
-
-    if !(DIGITS_REGEX.test(columnMetaData.colName))
-      columns[columnMetaData.colName] = column
-
-  # Return token
-  name: 'ROW'
-  event: 'row'
-  columns: columns
-
-module.exports = parser
+# s2.2.7.17
+
+valueParse = require('../value-parser')
+sprintf = require('sprintf').sprintf
+
+DIGITS_REGEX = /^\d+$/
+
+parser = (buffer, columnsMetaData) ->
+  columns = []
+  for columnMetaData in columnsMetaData
+    #console.log sprintf('Token @ 0x%02X', buffer.position)
+
+    value = valueParse(buffer, columnMetaData)
+
+    column =
+      value: value
+      metadata: columnMetaData
+
+    columns.push(column)
+
+    if !(DIGITS_REGEX.test(columnMetaData.colName))
+      saveColumn(columnMetaData.colName, columns, column)
+
+  # Return token
+  name: 'ROW'
+  event: 'row'
+  columns: columns
+
+saveColumn = (columnName, columns, value) ->
+  entry = columns[columnName]
+  if !entry
+    columns[columnName] = value;
+  else if Array.isArray(entry)
+    entry.push(value)
+  else
+    columns[columnName] = [entry, value]
+
+module.exports = parser