Posted by
Jacky Li on
Jul 08, 2018; 2:15pm
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/CarbonStore-Java-REST-API-proposal-tp54196p54898.html
Answer inline.
> 在 2018年7月6日，下午3:24，xuchuanyin <
[hidden email]> 写道：
>
> Hi, jacky, please check the following comments:
>
>
> 1. Do we need to provide other inferfaces, such as `listTable`,
> `renameTable`…
As of now, I have added getTable to return the CarbonTable. For more metadata interfaces like listTable, renameTable you mentioned, I would like to add it later if there are use cases for them.
>
> 2. What's the difference between the function of 'Carbon-SDK' and
> ‘CarbonStore'
Carbon SDK is used for reading and writing carbondata files, it is in file level, while CarbonStore is a store level interface that operates on “Table”. And CarbonStore is built on top of Carbon-SDK
>
> As for the CarbonStore API `createTable`:
> 3. Will it make use of the existing `TableSchemaBuilder`?
Yes, it will
> 4. Better to return the `TableIdentifier` instead of `void`?
Now, TableIdentifier is a simple object that contains table name and database name (optional). I think user wants to provide this when creating table. I guess you want createTable to return CarbonTable? This can be consider, I just prefer to keep the interface simple as a first step.
>
> As for the CarbonStore API `loadData`:
> 5. Is it possible to return the number of records that have been loaded.
I think this can be consider, are you looking for a specific use case?
>
> 6. What's the relationship between `CarbonStore` and Session? (for set
> command)
CarbonStore is targeted as a library that works independently without compute framework like spark. As we are adding more functionality to carbon, I think we’d better to add them in CarbonStore in the future, and spark/presto can integrate CarbonStore in its integration module. So to answer your question, one possibility is that CarbonSession will use CarbonStore internally, to be specific, CarbonScanRDD will use CarbonStore.
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