[jira] [Commented] (CARBONDATA-2951) CSDK: Provide C++ interface for SDK

[Akash R Nilugal (Jira)]

    [ https://issues.apache.org/jira/browse/CARBONDATA-2951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694113#comment-16694113 ]

xubo245 commented on CARBONDATA-2951:
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https://www.youtube.com/watch?v=lhsAg2H_GXc

> CSDK: Provide C++ interface for SDK
> -----------------------------------
>
>                 Key: CARBONDATA-2951
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-2951
>             Project: CarbonData
>          Issue Type: Task
>          Components: other
>    Affects Versions: 1.5.0
>            Reporter: xubo245
>            Assignee: xubo245
>            Priority: Critical
>             Fix For: NONE
>
>
> For the some user of using C++ code in their project, they can't call CarbonData interface and integrate CarbonData into their C++ project. So we plan to provide C++  interface for C++ user to integrate carbon, including read and write CarbonData. It's will more convenient for they.
> We plan to design and develop  as following:
> 1. Provide CarbonReader for SDK, it can read carbon data in C++ language
> ##features/interfaces
>         1.1. create CarbonReader
>   1.2. hasNext()
>   1.3. readNextRow()
>   1.4. close()
>   1.5. support OBS(AK/SK/Endpoint)
>   1.6 support batch read(withBatch,readNextBatchRow)
>   1.7 support vecor read(default) and carbonrecordreader （withRowRecordReader）
>   1.8 projection
>
> ##support data types:
> String, Long,Varchar(string),Short,Int,Date(int),timestamp(long),boolean,Decimal(string),Float
> Array<String> in carbonrecordreader, not support in vectorreader
> byte=>support in java RowUtil, not in C++ carbon reader
>
> ## Schema and data
> Create table tbl_email_form_to_for_XX(
> Event_Time Timestamp,
> Ingestion_Time Timestamp,
> From_Email String,
> To_Email String,
> From_To_type String,
> Event_ID String
> ) using carbon options(path ‘obs://X/tbl_email_form_to_for_XX’)
> ETL 6 columns from 18 columns table
>
> example data:
> [hidden email] [hidden email] from_to <29528303.1075855666657.JavaMail.evans@thyme> 1538015497000000 9755149200000
> 2. the performance should be reach X millions records/s/node
> 3.Provide CarbonWriter for SDK, it can write carbon data in C++ language
> ##features/interfaces
> 3.1. create CarbonWriter, including create schema(withCsvInput),set outputPath, and build,
> 3.2. write()
> 3.3. close()
> 3.4. support OBS(AK/SK/Endpoint)(withHadoopConf)
> 3.5. writtenBy
> 3.6.     support withTableProperty, withLoadOption,taskNo, uniqueIdentifier, withThreadSafe,  withBlockSize, withBlockletSize, localDictionaryThreshold, enableLocalDictionary in C++ SDK (PR2899 TO BE review)
>
> ##Data types:
>   Carbon need support base data types, including string, float, double, int, long, date, timestamp, bool, array<String>.
>           For other, we can convert:
>              char array => carbon string
>              Enum => Carbon string
>               set and list => carbon array<String>
> ##performance
> Writing Performance is not required now
>
> 4. read schema function
> readSchema
> getVersionDetails  =>TODO
> 5. support carbonproperties
> 5.1 addProperty
> 5.2 getProperty
>
> 6.TODO:
> 6.1.getVersionDetails. => to be review
> 6.2.updated SDK/CSDK reader doc => to be review
> 6.3.support byte(write read)
> 6.4.support long string columns
> 6.5.support sortBy=> to be review
> 6.6.support withCsvInput(Schema schema);  create schema(JAVA)
> 6.7. optimize the write doc => to be review
> /**
> * Create a {@link CarbonWriterBuilder} to build a {@link CarbonWriter}
> */
> public static CarbonWriterBuilder builder() {
> return new CarbonWriterBuilder();
> }

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