[SPARK-12244][SPARK-12245][STREAMING] Rename trackStateByKey to mapWithState
and change tracking function signature
SPARK-12244:
Based on feedback from early users and personal experience attempting to
explain it, the name trackStateByKey had two problem.
"trackState" is a completely new term
[SPARK-12244][SPARK-12245][STREAMING] Rename trackStateByKey to mapWithState
and change tracking function signature
SPARK-12244:
Based on feedback from early users and personal experience attempting to
explain it, the name trackStateByKey had two problem.
"trackState" is a completely new term