Hi,
we have some confusion about hive ：
1、what is the difference between hcatalog and hiveserver2 ,does hiveserver2 rely on hcatalog ?
2、what is the layer of hcatalog and hiverserver2 in the whole Hive Architecture ?
3、how does spark sql read hive tables , through hcatalog or hiveserver2 ?
thanks for any replys
