Overwriting conflict when i load table from hive

When you run the sample.sh, it actually does two things. One is to generate 
a few tables in Hive, another one is to generate the table metadata in 
Kylin's learn_kylin project which is saved in the metastore. You need click 
"System" tab "Reload Metadata" button to reload the metadata. After that 
the inconsistency status between Kylin instance and metastore will 
disappear.