Split code into FieldSqlBuilder

Change-Id: Ib6b3a3bddb5906e5a752238cfd84ab1fe6ee344a
add logic to SchemaBuilders

Change-Id: Ie19cab860c47f2a3562ad9cad9a642d57a8a751e
Merge changes Ie19cab86,Ib6b3a3bd

* changes:
  add logic to SchemaBuilders
  Split code into FieldSqlBuilder