[jira] Commented: (PIG-1211) Pig script runs half way after which it reports syntax error

["Ashutosh Chauhan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859462#action_12859462 ] 

Ashutosh Chauhan commented on PIG-1211:
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bq. Can we have an option to do something like "checkscript" instead of explain to get the same syntax error? In this way I can ensure that I do not run for 3-4 hours before encountering a syntax error

Though its possible to add something like checkscript. But, it will be a syntactic sugar, since it will do the same exact thing as explain does (but not printing the plan at the end). So,  I am thinking, shall we tell users to run explain to catch syntax errors, instead of adding this new command line option? What do others think ?

> Pig script runs half way after which it reports syntax error
> ------------------------------------------------------------
>
>                 Key: PIG-1211
>                 URL: https://issues.apache.org/jira/browse/PIG-1211
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>    Affects Versions: 0.6.0
>            Reporter: Viraj Bhat
>             Fix For: 0.8.0
>
>
> I have a Pig script which is structured in the following way
> {code}
> register cp.jar
> dataset = load '/data/dataset/' using PigStorage('\u0001') as (col1, col2, col3, col4, col5);
> filtered_dataset = filter dataset by (col1 == 1);
> proj_filtered_dataset = foreach filtered_dataset generate col2, col3;
> rmf $output1;
> store proj_filtered_dataset into '$output1' using PigStorage();
> second_stream = foreach filtered_dataset  generate col2, col4, col5;
> group_second_stream = group second_stream by col4;
> output2 = foreach group_second_stream {
>  a =  second_stream.col2
>  b =   distinct second_stream.col5;
>  c = order b by $0;
>  generate 1 as key, group as keyword, MYUDF(c, 100) as finalcalc;
> }
> rmf  $output2;
> --syntax error here
> store output2 to '$output2' using PigStorage();
> {code}
> I run this script using the Multi-query option, it runs successfully till the first store but later fails with a syntax error. 
> The usage of HDFS option, "rmf" causes the first store to execute. 
> The only option the I have is to run an explain before running his script 
> grunt> explain -script myscript.pig -out explain.out
> or moving the rmf statements to the top of the script
> Here are some questions:
> a) Can we have an option to do something like "checkscript" instead of explain to get the same syntax error?  In this way I can ensure that I do not run for 3-4 hours before encountering a syntax error
> b) Can pig not figure out a way to re-order the rmf statements since all the store directories are variables
> Thanks
> Viraj

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