[DISCUSSION] Propose to remove "support spark 1.5" from CarbonData 1.2.0 onwards

[Liang Chen]

Hi Dev

As you know, some key features only be supported by Spark 1.6 and Spark
2.1, for example : update and delete. so i propose to remove "support spark
1.5" from CarbonData 1.2.0 onwards, please discuss and vote.

Regards
Liang