anchor.diff:  ...
   ==>Row[stephen, 2015, purcellville]
   ==>Row[stephen, 2016, purcellville]
  -gremlin> session.execute("SELECT COUNT(*) FROM locations")
  -==>Row[52]
   ----
   
   [[def-usage]]
  
positive.code: gremlin> :install com.datastax.cassandra cassandra-driver-core 2.1.9
  ==>Loaded: [com.datastax.cassandra, cassandra-driver-core, 2.1.9]
  gremlin> import com.datastax.driver.core.*
  ==>groovy.grape.Grape, org.apache.commons.configuration.*, ... java.time.Year, com.datastax.driver.core.*
  gremlin> cluster = com.datastax.driver.core.Cluster.builder().addContactPoint("localhost").build()
  ==>com.datastax.driver.core.Cluster@3e1624c7
  gremlin> session = cluster.connect()
  
negative.code: gremlin>       select("person","year","location").by("name").by().by().
  gremlin>       sideEffect{
  gremlin>         def row = it.get()
  gremlin>         def statement = insertInto("locations").
  gremlin>                         value("name", row.person).
  gremlin>                         value("location", row.location).
  gremlin>                         value("year", row.year)
  gremlin>         session.execute(statement)
  gremlin>       }.iterate()
  gremlin> session.execute(select().all().from("locations"))
  ==>Row[daniel, 2004, kaiserslautern]
  ==>Row[daniel, 2005, kaiserslautern]
  ==>Row[daniel, 2006, aachen]
  