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https://issues.apache.org/jira/browse/BAHIR-102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963077#comment-15963077
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ASF GitHub Bot commented on BAHIR-102:
--------------------------------------
Github user emlaver commented on a diff in the pull request:
https://github.com/apache/bahir/pull/41#discussion_r110696516
--- 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 --
This description is a bit unclear. How about: `When set to true, the _find
endpoint will be queried. The _all_docs endpoint will be used when set to
false (default setting). Note: When querying against the _find endpoint, RDD
partition is limited to one so parallel loading is not an available option.`
Also, I'm having a hard time understanding this: `some query predicates will be
driven into datastore`.
> 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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