GitHub user gengliangwang opened a pull request:

    [SPARK-23624][SQL]Revise doc of method pushFilters in Datasource V2

    ## What changes were proposed in this pull request?
    Revise doc of method pushFilters in 
    In `FileSourceStrategy`, except `partitionKeyFilters`(the references of 
which is subset of partition keys), all filters needs to be evaluated after 
scanning. Otherwise, Spark will get wrong result from data sources like 
    This PR is to improve the doc.

You can merge this pull request into a Git repository by running:

    $ git pull revise_pushdown_doc

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #20769
commit bc98b206aefc6663884ad0e5f6052ac214094180
Author: Wang Gengliang <>
Date:   2018-03-08T04:20:02Z

    Update doc for SupportsPushDownCatalystFilters and SupportsPushDownFilters



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