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https://issues.apache.org/jira/browse/PIG-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139503#comment-13139503
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Daniel Dai commented on PIG-2339:
---------------------------------
TypeCastInserter adds one ForEach between load and filter, so
PartitionFilterOptimizer does not push filter into loader. This is new in Pig
0.9 since 0.8 does not insert foreach in this case.
We do push filter up later, so we can adjust the sequence of rule: run
PushUpFilter before PartitionFilterOptimizer to solve the problem.
> HCatLoader loads all the partitions in a partitioned table even though a
> filter clause on the partitions is specified in the Pig script
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: PIG-2339
> URL: https://issues.apache.org/jira/browse/PIG-2339
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.8.1, 0.9.0
> Reporter: Viraj Bhat
> Fix For: 0.9.1, 0.8.2
>
>
> A table created by HCAT has the following partitions;
> hcat -e "show partitions paritionedtable"
> {quote}
> grid=AB/dt=2011_07_01
> grid=AB/dt=2011_07_02
> grid=AB/dt=2011_07_03
> grid=XY/dt=2011_07_01
> grid=XY/dt=2011_07_02
> grid=XY/dt=2011_07_03
> grid=XY/dt=2011_07_04
> ...
> {quote}
> The total number of partitions in the table is around 3200.
> A Pig script of this nature tries to access this data using the partitions in
> it's filter.
> {script}
> A = LOAD 'paritionedtable' USING org.apache.hcatalog.pig.HCatLoader();
> B = FILTER A BY grid=='AB' AND dt=='2011_07_04';
> C = LIMIT B 10;
> store C into 'HCAT' using PigStorage();
> {script}
> This script, fails to run as the job.xml generated by Pig is so large (8MB),
> that the Hadoop Fred's limitation does not allow it to submit the job.
> After debugging it was found that in the HCatTableInfo class the function
> gets a null filter value. getInputTableInfo(filter=null ..)
> I suspect that "setPartitionFilter" function in Pig does not pass the filter
> correctly to the HCatLoader. This is happening with both Pig 0.9 and 0.8
> Viraj
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