[PIG-3622] Allow casting bytearray fields to bytearray type

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.16.0

Environment

0.12

• Patch Info: Patch Available
• Hadoop Flags: Reviewed
• Assignee: Redis Liu
• Reporter: Redis Liu
• Created: 13/Dec/13 10:14
• Updated: 08/Jun/16 20:48
• Resolved: 03/Aug/15 23:17

Description

test.pig:
AA = load '1.txt' USING PigStorage(' ') as (a:bytearray, b:chararray, c:chararray);

AA1 = filter AA by a == '1';
AA2 = foreach AA1 generate *, ( a == '1' ? a : null ) as myd;
dump AA2;

the INPUT file 1.txt is as below:
a b c
1 2 3
4 5 6
2 3 4
b a c
c a b

run the pig script in this way:

1. pig -x local test.pig

It'll fail with this error message:
Pig Stack Trace
---------------
ERROR 1051: Cannot cast to bytearray

org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias AA2
at org.apache.pig.PigServer.openIterator(PigServer.java:882)
at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:774)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:372)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:198)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:173)
at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)
at org.apache.pig.Main.run(Main.java:607)
at org.apache.pig.Main.main(Main.java:156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:200)
Caused by: org.apache.pig.PigException: ERROR 1002: Unable to store alias AA2
at org.apache.pig.PigServer.storeEx(PigServer.java:984)
at org.apache.pig.PigServer.store(PigServer.java:944)
at org.apache.pig.PigServer.openIterator(PigServer.java:857)
... 12 more
Caused by: org.apache.pig.impl.logicalLayer.validators.TypeCheckerException: ERROR 1059:
<file test.pig, line 7, column 6> Problem while reconciling output schema of ForEach
at org.apache.pig.newplan.logical.visitor.TypeCheckingRelVisitor.throwTypeCheckerException(TypeCheckingRelVisitor.java:142)
at org.apache.pig.newplan.logical.visitor.TypeCheckingRelVisitor.visit(TypeCheckingRelVisitor.java:182)
at org.apache.pig.newplan.logical.relational.LOForEach.accept(LOForEach.java:76)
at org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
at org.apache.pig.PigServer$Graph.compile(PigServer.java:1733)
at org.apache.pig.PigServer$Graph.compile(PigServer.java:1710)
at org.apache.pig.PigServer$Graph.access$200(PigServer.java:1411)
at org.apache.pig.PigServer.storeEx(PigServer.java:979)
... 14 more
Caused by: org.apache.pig.impl.logicalLayer.validators.TypeCheckerException: ERROR 2216:
<file test.pig, line 7, column 34> Problem getting fieldSchema for (Name: Cast Type: bytearray Uid: 17)
at org.apache.pig.newplan.logical.visitor.TypeCheckingExpVisitor.visit(TypeCheckingExpVisitor.java:603)
at org.apache.pig.newplan.logical.expression.BinCondExpression.accept(BinCondExpression.java:84)
at org.apache.pig.newplan.ReverseDependencyOrderWalker.walk(ReverseDependencyOrderWalker.java:70)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
at org.apache.pig.newplan.logical.visitor.TypeCheckingRelVisitor.visitExpressionPlan(TypeCheckingRelVisitor.java:191)
at org.apache.pig.newplan.logical.visitor.TypeCheckingRelVisitor.visit(TypeCheckingRelVisitor.java:157)
at org.apache.pig.newplan.logical.relational.LOGenerate.accept(LOGenerate.java:242)
at org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
at org.apache.pig.newplan.logical.visitor.TypeCheckingRelVisitor.visit(TypeCheckingRelVisitor.java:174)
... 21 more
Caused by: org.apache.pig.impl.logicalLayer.validators.TypeCheckerException: ERROR 1051: Cannot cast to bytearray
at org.apache.pig.newplan.logical.visitor.TypeCheckingExpVisitor.visit(TypeCheckingExpVisitor.java:494)
at org.apache.pig.newplan.logical.visitor.TypeCheckingExpVisitor.insertCast(TypeCheckingExpVisitor.java:472)
at org.apache.pig.newplan.logical.visitor.TypeCheckingExpVisitor.visit(TypeCheckingExpVisitor.java:599)
... 30 more
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