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https://issues.apache.org/jira/browse/GRIFFIN-333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Obaidul Karim updated GRIFFIN-333:
----------------------------------
Fix Version/s: (was: 0.6.0)
> JDBC Connector: Ability to Use "group by" caluse
> ------------------------------------------------
>
> Key: GRIFFIN-333
> URL: https://issues.apache.org/jira/browse/GRIFFIN-333
> Project: Griffin
> Issue Type: Improvement
> Components: accuracy-batch
> Affects Versions: 0.6.0
> Reporter: Obaidul Karim
> Priority: Major
>
> Refer to https://issues.apache.org/jira/projects/GRIFFIN/issues/GRIFFIN-332.
> If we have the ability to select specific columns, it will open the door to
> use sql base aggregation, further reducing the volume of data from JDBC
> sources.
> So, I propose the feature to allow JDBC connector to able to use sql based
> aggregations using clause `groupby`
> ------------------------
> |employee_id |country|
> ------------------------
> |1 | NZ |
> |2 | DE |
> |3 | DE |
> |4 | NZ |
> |5 | DE |
> ....
> ....
> ------------------------
> Let's say we have source and target tables that have data like below.
> src:
> {code:java}
> ------------------------
> |employee_id |country|
> ------------------------
> |1 | NZ |
> |2 | DE |
> |3 | DE |
> |4 | NZ |
> |5 | DE |
> ....
> ....
> ------------------------
> {code}
> tgt:
> {code:java}
> ------------------------
> |total_employee|country|
> ------------------------
> |10 | NZ |
> |11 | DE |
> ------------------------
> {code}
> Then we can perform `accuracy` check directly like below using `columns` and
> `groupby` clauses for source table:
> {code:java}
> { "name":"src",
> "connector":{ "type":"jdbc",
> "config":{ "database":"mydatabase",
> "tablename":"mytable",
> "columns":"count(*) total_employee, country",
> "groupby":"country",
> "url":"jdbc:sqlserver://myhost:1433;databaseName=mydatabase",
> "user":"user",
> "password":"password",
> "driver":"com.microsoft.sqlserver.jdbc.SQLServerDriver",
> "where":""
> }
> }
> }
> {code}
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