Regexp passed from pigscript fails in UDF
-------------------------------------------
Key: PIG-738
URL: https://issues.apache.org/jira/browse/PIG-738
Project: Pig
Issue Type: Bug
Components: grunt
Affects Versions: 0.3.0
Reporter: Viraj Bhat
Fix For: 0.3.0
Consider a pig script which parses and counts regular expressions from a text
file.
The regular expression supplied in the Pig script needs to escape the "."
(dot) character.
{code}
register myregexp.jar;
-- pattern not picked up
define minelogs ci_pig_udfs.RegexGroupCount('www\\.yahoo\\.com/sports');
A = load '/user/viraj/regexpinput.txt' using PigStorage() as (source :
chararray);
B = foreach A generate minelogs(source) as sportslogs;
dump B;
{code}
Snippet of UDF RegexGroupCount.java
{code}
public class RegexGroupCount extends EvalFunc<Integer> {
private final Pattern pattern_;
public RegexGroupCount(String patternStr) {
System.out.println("My pattern supplied is "+patternStr);
System.out.println("Equality test
"+patternStr.equals("www\\.yahoo\\.com/sports"));
pattern_ = Pattern.compile(patternStr,
Pattern.DOTALL|Pattern.CASE_INSENSITIVE);
}
public Integer exec(Tuple input) throws IOException {
}
}
{code}
Running the above script on the following dataset :
====================================================================================================
dshfdskfwww.yahoo.com/sportsjoadfjdslpdshfdskfwww.yahoo.com/sportsjoadfjdsl
kas;dka;sd
jsjsjwww.yahoo.com/sports
jsdLSJDcom/sports
wwwJyahooMcom/sports
====================================================================================================
Results in the following:
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
Userfunc: (Name: UserFunc viraj-Sat Mar 28 02:06:31 PDT 2009-14 function:
ci_pig_udfs.RegexGroupCount('www\\.yahoo\\.com/sports') Operator Key: viraj-Sat
Mar 28 02:06:31 PDT 2009-14)
Userfunc fs: int
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
My pattern supplied is www\\.yahoo\\.com/sports
Equality test false
2009-03-28 02:06:43,923 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- 100% complete
2009-03-28 02:06:43,923 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- Success!
(0)
(0)
(0)
(0)
(0)
====================================================================================================
In essence there seems to be no way of passing this type of constructor
argument through the Pig script. The only workaround seems to be hard coding
the values in the UDF!!
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