Fix schema/table param_value type, change it to clob for large VIEW.
modify desctable to add fileSplited information to table columns
Fix long view creation bug; and remove invalid files automatically.
Merge remote-tracking branch 'origin/zhuqihan' into v0.2, OK
fix del file bug in checker thread; add set_loadstatus_bad for ulss.
Add node group to device for shared/backup device.
Fix listTableFiles bug on Query and Filter.
add column_type when alter_table_add_column
Merge remote-tracking branch 'origin/v0.2' into zhaoyang
fix createOrUpdateDevice typo.
Merge remote-tracking branch 'origin/v0.2' into zhaoyang
fix bug when msg send fails