Should clean the Graph when register another Pig Script
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Key: PIG-1464
URL: https://issues.apache.org/jira/browse/PIG-1464
Project: Pig
Issue Type: Bug
Components: grunt
Affects Versions: 0.8.0
Reporter: Jeff Zhang
Assignee: Jeff Zhang
Fix For: 0.8.0
In the current implementation, the variable names in pig script are all global
variable. This make one pig script know the variable in other scripts. In my
opinion, this is not right. Every relation name in pig script should be local
variable, otherwise it will bring in unexpected result. This issue relates to
PIG-1423
E.g there are two pig script as follows:
Test_1.pig
{code}
a = load 'data/b.txt' ;
{code}
Test_2.pig
{code}
b = foreach a generate $0; // "a" is recognized by Grunt although it is in
Test_1.pig
{code}
And the following execute normally, do not throw any exception
{code}
PigServer pig=new PigServer(ExecType.Local);
pig.registerScript("Test_1.pig");
pig.registerScript("Test_2.pig");
{code}
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