fix NPE
Merge branch 'inverted-index' of https://github.com/KylinOLAP/Kylin into inverted-index
Merge branch 'inverted-index' of https://github.com/KylinOLAP/Kylin into inverted-index
Merge branch 'inverted-index' of https://github.com/KylinOLAP/Kylin into inverted-index
use [db.table] to distinguish tables with same name in different db
refactor example
Merge pull request #171 from qhzhou/inverted-index

Inverted index