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From "Xu Zhang (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-152) Solution for PIG-123 might have introduced parsing errors on Windows with the Pig unit tests
Date Mon, 17 Mar 2008 20:34:24 GMT
Solution for PIG-123 might have introduced parsing errors on Windows with the Pig unit tests
--------------------------------------------------------------------------------------------

                 Key: PIG-152
                 URL: https://issues.apache.org/jira/browse/PIG-152
             Project: Pig
          Issue Type: Bug
          Components: impl
            Reporter: Xu Zhang


*Since the changes for PIG-123 were checked in, we got lots of parsing errors when running
the unit tests on Windows.*

It seems all these errors are generated when a query string that contains a single quote for
the path of the data file is passed into the PigServer::registerQuery() method.  

Here is an example of such an error and the location where it is generated in the unit test
code (on the line "pig.registerQuery(query);" in the following code):

{noformat}
org.apache.pig.impl.logicalLayer.parser.TokenMgrError: Lexical error at line 1, column 39.
 Encountered: "W" (87), after : "\'file:c:\\"
	at org.apache.pig.impl.logicalLayer.parser.QueryParserTokenManager.getNextToken(QueryParserTokenManager.java:1599)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.jj_consume_token(QueryParser.java:4069)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.FileName(QueryParser.java:717)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.LoadClause(QueryParser.java:615)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseExpr(QueryParser.java:497)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.NestedExpr(QueryParser.java:425)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.GroupItem(QueryParser.java:1043)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.CogroupClause(QueryParser.java:996)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseExpr(QueryParser.java:523)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.NestedExpr(QueryParser.java:425)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.ForEachClause(QueryParser.java:1364)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.BaseExpr(QueryParser.java:552)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.Expr(QueryParser.java:373)
	at org.apache.pig.impl.logicalLayer.parser.QueryParser.Parse(QueryParser.java:227)
	at org.apache.pig.impl.logicalLayer.LogicalPlanBuilder.parse(LogicalPlanBuilder.java:47)
	at org.apache.pig.PigServer.registerQuery(PigServer.java:237)
	at org.apache.pig.test.TestAlgebraicEval.testSimpleCount(TestAlgebraicEval.java:50)

Standard Output

Starting DataNode 0 with dfs.data.dir: dfs\data\data1,dfs\data\data2
Starting DataNode 1 with dfs.data.dir: dfs\data\data3,dfs\data\data4
Starting DataNode 2 with dfs.data.dir: dfs\data\data5,dfs\data\data6
Starting DataNode 3 with dfs.data.dir: dfs\data\data7,dfs\data\data8
myid =  foreach (group (load 'file:c:\WINDOWS\TEMP\test39837txt') all) generate COUNT($1);
myid = foreach (group (load 'file:c:\WINDOWS\TEMP\test39838txt') all) generate group, COUNT($1)
;
myid = foreach (group (load 'file:c:\WINDOWS\TEMP\test39839txt') all) generate COUNT($1),
group ;
myid = foreach (group (load 'file:c:\WINDOWS\TEMP\test39840txt' using org.apache.pig.builtin.PigStorage(':'))
by $0) generate group, COUNT($1.$1) ;
myid = foreach (group (load 'file:c:\WINDOWS\TEMP\test39841txt' using org.apache.pig.builtin.PigStorage(':'))
by $0) generate group, COUNT($1.$1), COUNT($1.$0) ;
{noformat}

Here is the corresponding code:

{code}
public class TestAlgebraicEval extends TestCase {
    
	MiniCluster cluster = MiniCluster.buildCluster();
    @Test
    public void testSimpleCount() throws Throwable {
        int LOOP_COUNT = 1024;
        PigServer pig = new PigServer(MAPREDUCE);
        File tmpFile = File.createTempFile("test", "txt");
        PrintStream ps = new PrintStream(new FileOutputStream(tmpFile));
        for(int i = 0; i < LOOP_COUNT; i++) {
            ps.println(i);
        }
        ps.close();
        String query = "myid =  foreach (group (load 'file:" + tmpFile + "') all) generate
COUNT($1);";
        System.out.println(query);
        pig.registerQuery(query);
        Iterator it = pig.openIterator("myid");
        tmpFile.delete();
        Tuple t = (Tuple)it.next();
        Double count = t.getAtomField(0).numval();
        assertEquals(count, (double)LOOP_COUNT);
    }

    .
    .
    .
{code}

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