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https://issues.apache.org/jira/browse/BAHIR-102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963173#comment-15963173
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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_r110706772
--- 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 --
Ok - I'm still having a hard time understanding the statement `some of the
query predicates will be driven into datastore`. What do you mean by driven?
Does it have to do with `partitions used to drive JsonStoreRDD loading query
result in parallel` ?
Also, `As RDD partition is ONE during _find` - one what? set to one
partition for the `jsonstore.rdd.partitions` configuration?
And for `parallel loading is not achieved` - This sounds awkward to me. Is
it not achieved because the `_find` endpoint only supports one partition?
> 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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