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https://issues.apache.org/jira/browse/PIG-255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ajay Garg updated PIG-255:
--------------------------
Attachment: new.patch
Attaching the patch (new.patch) for the modification explained by Shravan. Btw
following is the stack trace of the error without patch.
java.io.IOException: Could not resolve
org.apache.pig.builtin.COR$Final('a','b','c') using imports: [,
org.apache.pig.builtin., org.apache.pig.builtin.Math.,
com.yahoo.pig.yst.sds.ULT., org.apache.pig.impl.builtin.]
at
org.apache.pig.impl.util.WrappedIOException.wrap(WrappedIOException.java:16)
at org.apache.pig.impl.PigContext.resolveClassName(PigContext.java:428)
at org.apache.pig.impl.PigContext.getClassForAlias(PigContext.java:513)
at org.apache.pig.impl.util.JarManager.createJar(JarManager.java:109)
at
org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher.launchPig(MapReduceLauncher.java:159)
at
org.apache.pig.backend.hadoop.executionengine.POMapreduce.open(POMapreduce.java:185)
at
org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:275)
at org.apache.pig.PigServer.optimizeAndRunQuery(PigServer.java:413)
at org.apache.pig.PigServer.openIterator(PigServer.java:332)
at
org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:265)
at
org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:162)
at
org.apache.pig.tools.grunt.GruntParser.parseContOnError(GruntParser.java:73)
at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:54)
at org.apache.pig.Main.main(Main.java:273)
Caused by: java.lang.ClassNotFoundException: Could not resolve
org.apache.pig.builtin.COR$Final('a','b','c') using imports: [,
org.apache.pig.builtin., org.apache.pig.builtin.Math.,
com.yahoo.pig.yst.sds.ULT., org.apache.pig.impl.builtin.]
at org.apache.pig.impl.PigContext.resolveClassName(PigContext.java:427)
> Calling non default constructor of Final class from Main class in UDF
> ---------------------------------------------------------------------
>
> Key: PIG-255
> URL: https://issues.apache.org/jira/browse/PIG-255
> Project: Pig
> Issue Type: Improvement
> Reporter: Ajay Garg
> Priority: Minor
> Attachments: cons.patch, new.patch, test.patch
>
>
> Pig supports the use of define to call a non default constructor. Making it
> work across Algebraic functions is not possible with the current code. The
> problem is once the func is defined to use a non default constructor which
> takes in names of the variables, we have no way of transmitting this
> information from the main class to the final class. We tried passing the func
> spec through the call to getFinal(). That is, What ever names we get in the
> main class we store it and when the getFinal method is called, instead of
> just passing the name of the Final class we attach the string args received
> by the main class to the name to construct a func spec. For ex. if define COV
> = Covariance('Population', 'Height'); Then we would have the "Population' &
> 'Height' stored in the main class. A call to getFinal would return
> Covariance$Final("Population", "Height") instead of just Covariance$Final. I
> guess this is the right way to go. However, pig has a problem with this. The
> resolveClassName method doesn't think of its args as specs and assumes them
> to be just names. So in createJar, when the func spec,
> Covariance$Final("Population", "Height") is being resolved it fails. I think
> this is an issue with pig and we need to resolve it by clipping the args
> before doing a resolveClassName.
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