JackieTien97 opened a new pull request, #343:
URL: https://github.com/apache/tsfile/pull/343
For the reason that dbName in IoTDB should be at least two, so we add three
implementation classes in this pr:
### `TwoLevelDBExtractor`
used for DeviceId whose db level is 2, like `root.db`. There exist three
cases for two-level-db tree-style DeviceId:
1. database is also DeviceId, like `root.db` whose DeviceId is `{root, db}`,
no id column in such case
2. device has only one level excluding the db level, like `root.db.d1` whose
DeviceId is `{root.db, d1}`, only one id column in segment 1
3. device has more than one level excluding the db level, like
`root.db.a.d1` whose DeviceId is `{root.db.a, d1}`, id column start from
segment 0
### `ThreeLevelDBExtractor`
used for DeviceId whose db level is 3, like `root.a.db` There exist two
cases for three-level-db tree-style DeviceId:
1. database is also DeviceId, like `root.a.db` whose DeviceId is `{root.a,
db}`, no id column in such case
2. device has more than zero level excluding the db level, like
`root.a.db.d1` whose DeviceId is `{root.a.db, d1}`, id column start from
segment 1
### `FourOrHigherLevelDBExtractor`
used for DeviceId whose db level is 4 or higher, like `root.a.b.db` There
only exist one case for four-or-higher-level-db tree-style DeviceId, first
segment will be the first three level of db, so id column index starting from
`db_level - 2`:
1. like `root.a.b.db` whose DeviceId is `{root.a.b, db}`, no id column in
such case, also call say that id column starting from 2(not existing)
2. like `root.a.b.db.d1` whose DeviceId is` {root.a.b, db, d1}`, id column
starting from 2
3. like `root.a.b.db.c.d1` whose DeviceId is `{root.a.b, db, c, d1}`, id
column starting from 3
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