[jira] [Work logged] (GRIFFIN-322) Add SQL mode for ES connector

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GRIFFIN-322?focusedWorklogId=380625&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-380625 ]

ASF GitHub Bot logged work on GRIFFIN-322:
------------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Feb/20 02:05
            Start Date: 03/Feb/20 02:05
    Worklog Time Spent: 10m 
      Work Description: XiaoyuBD commented on issue #567: [GRIFFIN-322] Add SQL mode for ES connector
URL: https://github.com/apache/griffin/pull/567#issuecomment-581208319
 
 
   Could you please check this PR? @wankunde  Thanks.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 380625)
    Time Spent: 20m  (was: 10m)

> Add SQL mode for ES connector
> -----------------------------
>
>                 Key: GRIFFIN-322
>                 URL: https://issues.apache.org/jira/browse/GRIFFIN-322
>             Project: Griffin
>          Issue Type: Improvement
>            Reporter: XIAOYU YU
>            Priority: Major
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The ElasticSearch connector was added in Griffin. We want to enrich it by adding sql mode.
> ES SQL plugins are very popular, such as :  [https://github.com/NLPchina/elasticsearch-sql/wiki |https://github.com/NLPchina/elasticsearch-sql/wiki]and  [https://www.elastic.co/guide/en/elasticsearch/reference/7.x/xpack-sql.html].
> For example: 
> {code:java}
> curl -X POST 'http://{es_url}/_sql?format=csv'  -H 'Content-Type: application/json'  -d 'select a, b, c from {index} where a is not null limit 2'{code}
> would get csv response as follows:
>  
> {code:java}
> a,b,c
> 1,test,1.55
> 2,test,1.57{code}
>  
> So we want Griffin ES Connector could load data by ES SQL in sql mode.  In sql mode, user could config Connector for ES (with sql plugin) like: 
>  
> {{{ "type": "custom",}}
> {{  "config": {}}
> {{    "class": "org.apache.griffin.measure.datasource.connector.batch.ElasticSearchGriffinDataConnector",}}
> {{     "host": "xxxxxxx",}}
> {{     "port": "xxxx",}}
> {{     "sql": "select a, b, c from xxx where a = 2 limit 100"}}}
> {{}}}
>  
>  Which has the following benefits:
>  # For case that only part of the ES data is needed, or only aggregated result is needed, it could significantly reduce IO and improve performance by handle filter and aggregation to ES. 
>  # It is more user-friendly, since we don't need to define data size and schema. 



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