ASF GitHub Bot commented on BAHIR-102:

Github user yanglei99 commented on a diff in the pull request:

    --- Diff: sql-cloudant/README.md ---
    @@ -62,6 +62,8 @@ cloudant.protocol|https|protocol to use to transfer data: 
http or https
     cloudant.host||cloudant host url
     cloudant.username||cloudant userid
     cloudant.password||cloudant password
    +cloudant.useQuery|false|When enabled, for query not using index or view, 
_find will be used instead of _all_docs, some query predicates will be driven 
into datastore. However, RDD partition is ONE during _find, so parallel loading 
is not achieved
    --- End diff --
    I can use something @lresende suggested : the data source will look for 
ways to optimize the query execution by pushing down some of the query 
predicates into the data store.

> Support pushing down query predicates using Cloudant Query / CouchDB Mango 
> Query
> --------------------------------------------------------------------------------
>                 Key: BAHIR-102
>                 URL: https://issues.apache.org/jira/browse/BAHIR-102
>             Project: Bahir
>          Issue Type: Improvement
>            Reporter: Yang Lei
>            Assignee: Yang Lei
> The feature of Cloudant Query / ChoudDB Mango Query is stated here: 
> https://blog.couchdb.org/2016/08/03/feature-mango-query/.
> Will enable pushing down first level AND column filtering to _find selector 
> to replace _all_docs for the database query; will continue using skip+limit 
> to offer partition and parallel loading.

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