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https://issues.apache.org/jira/browse/PIG-3124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559182#comment-13559182
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Daniel Dai commented on PIG-3124:
---------------------------------
Seems it has been optimized by rule FilterAboveForeach. The test case
testForeachFilter is confusing, we should put the following remark:
PushDownForEachFlatten does not apply here because Pig decide to leave it to
rule FilterAboveForeach.
> Push FLATTENs After FILTERs If Possible
> ---------------------------------------
>
> Key: PIG-3124
> URL: https://issues.apache.org/jira/browse/PIG-3124
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Affects Versions: 0.10.0
> Reporter: Nick White
> Assignee: Nick White
> Fix For: 0.12
>
> Attachments: PIG-3124.0.patch
>
>
> When optimizing a logical plan, it's safe to push a FLATTEN after a FILTER if
> the columns being flattened don't occur in the expression that the filter is
> being done on. When the FILTER comes first the FLATTEN generates fewer rows
> (usually), and so is more efficient.
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