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Pig Change Log

Release 0.5.0 - Unreleased

INCOMPATIBLE CHANGES

IMPROVEMENTS
PIG-1020: Include an ant target to build pig.jar without hadoop libraries (daijy)
PIG-1039: documentation update (chandec via olgan)

OPTIMIZATIONS

BUG FIXES

PIG-963: Join in local mode matches null keys (pradeepkth)
PIG-660: Integration with Hadoop 20 (sms via olgan)
PIG-956: 10 minute commit tests (olgan)

Release 0.4.0 - 2009-09-26

INCOMPATIBLE CHANGES

PIG-892: Make COUNT and AVG deal with nulls accordingly with SQL standart
(olgan)
PIG-734: Changed maps to only take strings as keys (gates).

IMPROVEMENTS

PIG-938: documentation changes for Pig 0.4.0 release (chandec via olgan)

PIG-578: join ... outer, ... outer semantics are a no-ops, should produce
corresponding null values (pradeepkth)

PIG-936: making dump and PigDump independent from Tuple.toString (daijy)

PIG-890: Create a sampler interface and improve the skewed join sampler (sriranjan via daijy)

PIG-922: Logical optimizer: push up project part 1 (daijy)

PIG-812: COUNT(*) does not work (breed)

PIG-923: Allow specifying log file location through pig.properties (dvryaboy via daijy)

PIG-926: Merge-Join phase 2 (ashutoshc via pradeepkth)

PIG-845: PERFORMANCE: Merge Join (ashutoshc via pradeepkth)

PIG-893:  Added string -> integer, long, float, and double casts (zjffdu via gates). 

PIG-833: Added Zebra, new columnar storage mechanism for HDFS (rangadi plus many others via gates)

PIG-697: Proposed improvements to pig's optimizer, Phase5 (daijy)

PIG-895: Default parallel for Pig (daijy)

PIG-820: Change RandomSampleLoader to take a LoadFunc instead of extending
		BinStorage.  Added new Samplable interface for loaders to implement
		allowing them to be used by RandomSampleLoader (ashutoshc via gates).

PIG-832: Make import list configurable (daijy)

PIG-697: Proposed improvements to pig's optimizer (sms)

PIG-753:  Allow UDFs with no parameters (zjffdu via gates).

PIG-765: jdiff for pig ( gkesavan ).

OPTIMIZATIONS

PIG-792: skew join implementation (sriranjan via olgan)

BUG FIXES
    PIG-964: Handling null in skewed join (sriranjan via olgan)

    PIG-962: Skewed join creates 3 map reduce jobs (sriranjan via olgan)

    PIG-957: Tutorial is broken with 0.4 branch and trunk (pradeepkth)

    PIG-955: Skewed join produces invalid results  (yinghe via olgan)
    
    PIG-954: Skewed join fails when pig.skewedjoin.reduce.memusage is not
    configured(yinghe via olgan)

    PIG-882: log level not propogated to loggers - duplicate message (daijy)

    PIG-943: Pig crash when it cannot get counter from hadoop (daijy)

    PIG-935: Skewed join throws an exception when used with map keys(sriranjan
    via pradeepkth)

    PIG-934: Merge join implementation currently does not seek to right point
    on the right side input based on the offset provided by the index
    (ashutoshc via pradeepkth)

    PIG-925: Fix join in local mode (daijy)

    PIG-913: Error in Pig script when grouping on chararray column (daijy)

    PIG-907: Provide multiple version of HashFNV (Piggybank) (daijy)

    PIG-905: TOKENIZE throws exception on null data (daijy)

    PIG-901: InputSplit (SliceWrapper) created by Pig is big in size due to
    serialized PigContext (pradeepkth)

    PIG-882: log level not propogated to loggers (daijy)

    PIG-880: Order by is borken with complex fields (sms)
    
    PIG-773: Empty complex constants (empty bag, empty tuple and empty map)
    should be supported (ashutoshc via sms)

    PIG-695: Pig should not fail when error logs cannot be created (sms)

	PIG-878: Pig is returning too many blocks in the input split. (arunc via gates).

    PIG-888: Pig do not pass udf to the backend in some situation (daijy)

    PIG-728: All backend error messages must be logged to preserve the
    original error messages (sms)

    PIG-877: Push up filter does not account for added columns in foreach
    (sms)

    PIG-883: udf import list does not send to the backend (daijy)

    PIG-881: Pig should ship load udfs to the backend (daijy)

    PIG-876: limit changes order of order-by to ascending (daijy)

    PIG-851: Map type used as return type in UDFs not recognized at all times
    (zjffdu via sms)
    
    PIG-861: POJoinPackage lose tuple in large dataset (daijy)

    PIG-797: Limit with ORDER BY producing wrong results (daijy)

    PIG-850: Dump produce wrong result while "store into" is ok (daijy)

    PIG-852: pig -version or pig -help returns exit code of 1 (milindb via
    olgan)

    PIG-849: Local engine loses records in splits (hagleitn via olgan)

    PIG-939: Fix checkstyle ivy configuration ( gkesavan )

Release 0.3.0 - Unreleased

INCOMPATIBLE CHANGES

IMPROVEMENTS

PIG-817: documentation update (chandec via olgan)

PIG-830: Add RegExLoader and apache log utils to piggybank (dvryaboy via gates).

PIG-831: Turned off reporting of records and bytes written for mutli-store
queries as the returned results are confusing and wrong. (gates)

PIG-813: documentation updates (chandec via olgan)

PIG-825: PIG_HADOOP_VERSION should be set to 18 (dvryaboy via gates).

PIG-795: support for SAMPLE command (ericg via olgan)

PIG-619: Create one InputSplit even when the input file is zero length
         so that hadoop runs maps and creates output for the next
		 job (gates).

PIG-697: Proposed improvements to pig's optimizer (sms)

PIG-700: To automate the pig patch test process (gkesavan via sms)

PIG-712: Added utility functions to create schemas for tuples and bags (zjffdu
via gates).

PIG-652: Adapt changes in store interface to multi-query changes (hagleitn via gates).

PIG-775: PORelationToExprProject should create a NonSpillableDataBag to create
empty bags (pradeepkth)

PIG-741: Allow limit to be nested in a foreach.

PIG-627: multiquery support phase 3 (hagleitn and Richard Ding via olgan)

PIG-743: To implement clover (gkesavan)

PIG-701: Implement IVY for resolving pig dependencies (gkesavan)

PIG-626: Add access to hadoop counters (shubhamc via gates).

PIG-627: multiquery support phase 1 and phase 2 (hagleitn and Richard Ding via pradeepkth)

BUG FIXES

PIG-846: MultiQuery optimization in some cases has an issue when there is a
split in the map plan (pradeepkth)

PIG-835: Multiquery optimization does not handle the case where the map keys
in the split plans have different key types (tuple and non tuple key type)
(pradeepkth)

PIG-839: incorrect return codes on failure when using -f or -e flags (hagletin
via sms)

PIG-796: support conversion from numeric types to chararray (Ashutosh Chauhan
via pradeepkth)

PIG-564: problem with parameter substitution and special charachters (olgan)

PIG-802: PERFORMANCE: not creating bags for ORDER BY (serakesh via olgan)

PIG-816: PigStorage() does not accept Unicode characters in its contructor (pradeepkth)

PIG-818: Explain doesn't handle PODemux properly (hagleitn via olgan)

PIG-819: run -param -param; is a valid grunt command (milindb via olgan)

PIG-656: Use of eval or any other keyword in the package hierarchy of a UDF causes
parse exception (milindb via sms)

PIG-814: Make Binstorage more robust when data contains record markers (pradeepkth)

PIG-811: Globs with "?" in the pattern are broken in local mode (hagleitn via
olgan)

PIG-810: Fixed NPE in PigStats (gates)

PIG-804: problem with lineage with double map redirection (pradeepkth)

PIG-733: Order by sampling dumps entire sample to hdfs which causes dfs
"FileSystem closed" error on large input (pradeepkth)

PIG-693: Parameter to UDF which is an alias returned in another UDF in nested
foreach causes incorrect results (thejas via sms)

PIG-725: javadoc: warning - Multiple sources of package comments found for
package "org.apache.commons.logging" (gkesavan via sms)

PIG-745: Add DataType.toString() to force basic types to chararray, useful
for UDFs that want to handle all simple types as strings (ciemo via gates).

PIG-514: COUNT returns no results as a result of two filter statements in
FOREACH (pradeepkth)

PIG-789: Fix dump and illustrate to work with new multi-query feature 
(hagleitn via gates).

PIG-774: Pig does not handle Chinese characters (in both the parameter subsitution
using -param_file or embedded in the Pig script) correctly (daijy)

PIG-800: Fix distinct and order in local mode to not go into an infinite loop
(gates).

PIG-806: to remove author tags in the pig source code (sms).

PIG-799: Unit tests on windows are failing after multiquery commit (daijy)

PIG-781: Error reporting for failed MR jobs (hagleitn via olgan)

Release 0.2.0

INCOMPATIBLE CHANGES

    PIG-157: Add types and rework execution pipeline (gates)
    
    PIG-458: integration with Hadoop 18 (olgan)

NEW FEATURES
    PIG-139: command line editing (daijy via olgan)

    PIG-554 Added fragment replicate map side join (shravanmn via pkamath and gates)

    PIG-535: added rmf command

	PIG-704 Added ALIASES command that shows all currently defined ALIASES.
	Changed semantics of DEFINE to define last used alias if no argument is
	given (ericg via gates).

	PIG-713 Added alias completion as part of tab completion in grunt (ericg
	via gates).

IMPROVEMENTS

    PIG-270: proper line number for parse errors (daijy via olgan)
    
    PIG-367: convinience function for UDFs to name schema

    PIG-443:  Illustrate for the Types branch (shubham via olgan)

	PIG-599: Added buffering to BufferedPositionedInputStream (gates)
    
    PIG-629: performance improvement: getting rid of targeted tuple (pradeepkth
    via olgan)

    PIG-628: misc performance improvements (pradeepkth via olgan)

    PIG-589: error handling, phase 1-2 (sms via olgan)

    PIG-590: error handling, phase 3 (sms)

    PIG-591: error handling, phase 4 (sms)

    PIG-545: PERFORMANCE: Sampler for order bys does not produce a good
    distribution (pradeepkth)

    PIG-580: using combiner to compute distinct aggs (pradeepkth via olgan)

    PIG-636: Use lightweight bag implementations which do not register with
    SpillableMemoryManager with Combiner (pradeepkth)

    PIG-563: support for multiple combiner invocations (pradeepkth via olgan)

    PIG-465: performance improvement - removing keys from the value (pradeepkth
    via olgan)

    PIG-450: PERFORMANCE: Distinct should make use of combiner to remove
    duplicate values from keys. (gates)

    PIG-350: PERFORMANCE: Join optimization for pipeline rework (pradeepkth
    via gates)

BUG FIXES

    PIG-294: string comparator unit tests (sms via pi_song)

    PIG-258: cleaning up directories on failure (daijy via olgan)

    PIG-363: fix for describe to produce schema name

    PIG-368: making JobConf available to Load/Store UDFs

    PIG-311: cross is broken

    PIG-369: support for filter UDFs

    PIG-375: support for implicit split

    PIG-301: fix for order by descending

    PIG-378: fix for GENERATE + LIMIT

    PIG-362: don't push limit above generate with flatten

    PIG-381: bincond does not handle null data

    PIG-382: bincond throws typecast exception

    PIG-352: java.lang.ClassCastException when invalid field is accessed

    PIG-329: TestStoreOld, 2 unit tests were broken

    PIG-353: parsing of complex types

    PIG-392: error handling with multiple MRjobs

    PIG-397: code defaults to single reducer

    PIG-373: unconnected load causes problem,

    PIG-413: problem with float sum

    PIG-398: Expressions not allowed inside foreach (sms via olgan)

    PIG-418: divide by 0 problem

    PIG-402: order by with user comparator (shravanmn via olgan)

    PIG-415: problem with comparators (shravanmn via olgan)

    PIG-422: cross is broken (shravanmn via olgan)

    PIG-407: need to clone operators (pradeepkth via olgan)

    PIG-428: TypeCastInserter does not replace projects in inner plans
    correctly (pradeepkth vi olgan)

    PIG-421: error with complex nested plan (sms via olgan)
    
    PIG-429: Self join wth implicit split has the join output in wrong order
    (pradeepkth via olgan)

    PIG-434: short-circuit AND and OR (pradeepkth viia olgan)

    PIG-333: allowing no parethesis with single column alias with flatten (sms
    via olgan)

    PIG-426: Adding result of two UDFs gives a syntax error

    PIG-426: Adding result of two UDFs gives a syntax error (sms via olgan)

    PIG-436: alias is lost when single column is flattened (pradeepkth via
    olgan)

    PIG-364: Limit return incorrect records when we use multiple reducer
    (daijy via olgan)

    PIG-439: disallow alias renaming (pradeepkth via olgan)

    PIG-440: Exceptions from UDFs inside a foreach are not captured (pradeepkth
    via olgan)

    PIG-442: Disambiguated alias after a foreach flatten is not accessible a
    couple of statements after the foreach (sms via olgan)

    PIG-424: nested foreach with flatten and agg gives an error (sms via
    olgan)

    PIG-411: Pig leaves HOD processes behind if Ctrl-C is used before HOD
    connection is fully established (olgan)

    PIG-430: Projections in nested filter and inside foreach do not work (sms
    via olgan)

    PIG-445: Null Pointer Exceptions in the mappers leading to lot of retries
    (shravanmn via olgan)

    PIG-444: job.jar is left behined (pradeepkth via olgan)

    PIG-447: improved error messages (pradeepkth via olgan)

    PIG-448: explain broken after load with types (pradeepkth via olgan)

    PIG-380: invalid schema for databag constant (sms via olgan)

    PIG-451: If an field is part of group followed by flatten, then referring
    to it causes a parse error (pradeepkth via olgan)

    PIG-455: "group" alias is lost after a flatten(group) (pradeepkth vi olgan)

    PIG-459: increased sleep time before checking for job progress

    PIG-462: LIMIT N should create one output file with N rows (shravanmn via
    olgan)

    PIG-376: set job name (olgan)

    PIG-463: POCast changes (pradeepkth via olgan)

    PIG-427: casting input to UDFs
     
    PIG-437: as in alias names causing problems (sms via olgan)

    PIG-54: MIN/MAX don't deal with invalid data (pradeepkth via olgan)

    PIG-470: TextLoader should produce bytearrays (sms via olgan)

    PIG-335: lineage (sms vi olgan)

    PIG-464: bag schema definition (pradeepkth via olgan)

    PIG-457: report 100% on successful jobs only (shravanmn via olgan)

    PIG-471: ignoring status errors from hadoop (pradeepkth via olgan)

    PIG-489: (*) processing (sms via olgan)

    PIG-475: missing heartbeats (shravanmn via olgan)

    PIG-468: make determine Schema work for BinStorage (pradeepkth via olgan)

    PIG-494: invalid handling of UTF-8 data in PigStorage (pradeepkth via olgan)

    PIG-501: Make branches/types work under cygwin (daijy via olgan)

    PIG-504: cleanup illustrate not to produce cn= (shubham via olgan)

    PIG-469: make sure that describe says "int" not "integer" (sms via olgan)

    PIG-495: projecting of bags only give 1 field (olgan)

    PIG-500: Load Func for POCast is not being set in some cases (sms via
    olgan)

    PIG-499: parser issue with as (sms via olgan)

    PIG-507: permission error not reported (pradeepkth via olgan)

    PIG-508: problem with double joins (pradeepkth via olgan)

    PIG-497: problems with UTF8 handling in BinStorage (pradeepkth via olgan)

    PIG-505: working with map elements (sms via olgan)

    PIG-517: load functiin with parameters does not work with cast (pradeepkth
    via olgan)

    PIG-525: make sure cast for udf parameters works (olgan)

    PIG-512: Expressions in foreach lead to errors (sms via olgan)

    PIG-528: use UDF return in schema computation (sms via olgan)

    PIG-527: allow PigStorage to write out complex output (sms via olgan)

    PIG-537: Failure in Hadoop map collect stage due to type mismatch in the
    keys used in cogroup (pradeepkth vi olgan)

    PIG-538: support for null constants (pradeepkth via olgan)

    PIG-385: more null handling (pradeepkth via olgan)

    PIG-546: FilterFunc calls empty constructor when it should be calling
    parameterized constructor (sms via olgan)

    PIG-449: Schemas for bags should contain tuples all the time (pradeepkth via
    olgan)

    PIG-501: make unit tests run under windows (daijy via olgan)

	PIG-543: Restore local mode to truly run locally instead of use map
	reduce. (shubhamc via gates)

	PIG-556: Changed FindQuantiles to report progress.  Fixed issue with null
	reporter being passed to EvalFuncs. (gates)

	PIG-6: Add load support from hbase (hustlmsp via gates).

    PIG-522: make negation work (pradeepkth via olgan)

    PIG-558: Distinct followed by a Join results in Invalid size 0 for a tuple
    error (pradeepkth via olgan)

	PIG-572 A PigServer.registerScript() method, which lets a client
	programmatically register a Pig Script.  (shubhamc via gates)

    PIG-570:  problems with handling bzip data (breed via olgan)

    PIG-597: Fix for how * is treated by UDFs (shravanmn via olgan)

    PIG-623: Fix spelling errors in output messages (tomwhite via sms)

    PIG-622: Include pig executable in distribution (tomwhite via sms)

    PIG-615: Wrong number of jobs with limit (shravanmn via sms)

    PIG-635: POCast.java has incorrect formatting (sms)

    PIG-634: When POUnion is one of the roots of a map plan, POUnion.getNext()
    gives a null pointer exception (pradeepkth)

    PIG-632: Improved error message for binary operators (sms)

    PIG-636: Performance improvement: Use lightweight bag implementations which do not
    register with SpillableMemoryManager with Combiner (pradeepkth)

    PIG-631: 4 Unit test failures on Windows (daijy)

    PIG-645:  Streaming is broken with the latest trunk (pradeepkth)

    PIG-646: Distinct UDF should report progress (sms)

    PIG-647: memory sized passed on pig command line does not get propagated
    to JobConf (sms)

    PIG-648: BinStorage fails when it finds markers unexpectedly in the data
    (pradeepkth)

    PIG-649: RandomSampleLoader does not handle skipping correctly in
    getNext() (pradeepkth)

    PIG-560: UTFDataFormatException (encoded string too long) is thrown when
    storing strings > 65536 bytes (in UTF8 form) using BinStorage() (sms)

    PIG-642: Limit after FRJ causes problems (daijy)

    PIG-637: Limit broken after order by in the local mode (shubhamc via
    olgan)

    PIG-553: EvalFunc.finish() not getting called (shravanmn via sms)

    PIG-654: Optimize build.xml (daijy)

    PIG-574: allowing to run scripts from within grunt shell (hagleitn via
    olgan)

    PIG-665: Map key type not correctly set (for use when key is null) when
    map plan does not have localrearrange (pradeepkth)

    PIG-590: error handling on the backend (sms via olgan)

    PIG-590: error handling on the backend (sms)

    PIG-658: Data type long : When 'L' or 'l' is included with data 
    (123L or 123l) load produces null value. Also the case with Float (thejas
    via sms)

    PIG-591: Error handling phase four (sms via pradeepkth)

    PIG-664: Semantics of * is not consistent (sms)

    PIG-684: outputSchema method in TOKENIZE is broken (thejas via sms)

    PIG-655: Comparison of schemas of bincond operands is flawed (sms via
    pradeepkth)

    PIG-691: BinStorage skips tuples when ^A is present in data (pradeepkth
    via sms)

    PIG-577: outer join query looses name information (sms via pradeepkth)

    PIG-690: UNION doesn't work in the latest code (pradeepkth via sms)

    PIG-544: Utf8StorageConverter.java does not always produce NULLs when data
    is malformed(thejas via sms)

    PIG-532: Casting a field removes its alias.(thejas via sms)

    PIG-705: Pig should display a better error message when backend error
    messages cannot be parsed (sms)

    PIG-650: pig should look for and use the pig specific
    'pig-cluster-hadoop-site.xml' in the non HOD case just like it does in the
    HOD case (sms)

    PIG-699: Implement forrest docs target in Pig Build (gkesavan via olgan)

    PIG-706:  Implement ant target to use findbugs on PIG (gkesavan via olgan)

    PIG-708: implement releaseaudit tart to use rats on pig (gkesavan via
    olgan)

    PIG-703: user documentation (chandec vi olgan)

    PIG-711: Implement checkstyle for pig (gkesavan via olgan)

    PIG-715: doc updates (chandec vi olgan)

	PIG-620: Added MaxTupleBy1stField UDF to piggybank (vzaliva via gates)

	PIG-692: When running a job from a script, use the name of that script as
	the default name for the job (vzaliva via gates)

    PIG-718: To add standard ant targets to build.xml file  (gkesavan via olgan)

    PIG-720: further doc cleanup (gkesavan via olgan)

Release 0.1.1 - 2008-12-04

INCOMPATIBLE CHANGES

NEW FEATURES

IMPROVEMENTS

PIG-253: integration with hadoop-18

BUG FIXES

PIG-342: Fix DistinctDataBag to recalculate size after it has spilled.
(bdimcheff via gates)

Release 0.1.0 - 2008-09-11

  INCOMPATIBLE CHANGES

  PIG-123: requires escape of '\' in chars and string

  NEW FEATURES

  PIG-20 Added custom comparator functions for order by (phunt via gates)
  
  PIG-94: Streaming implementation (arunc via olgan)
  
  PIG-58: parameter substitution

  PIG-55: added custom splitter (groves via olgan)
  
  PIG-59: Add a new ILLUSTRATE command (shubhamc via gates).

  PIG-256: Added variable argument support for UDFs (pi_song)

  IMPROVEMENTS:

  PIG-8 added binary comparator (olgan)
  
  PIG-11 Add capability to search for jar file to register. (antmagna via olgan)
  
  PIG-7: Added use of combiner in some restricted cases. (gates)

  PIG-47: Added methods to DataMap to provide access to its content

  PIG-30: Rewrote DataBags to better handle decisions of when to spill to
	disk and to spill more intelligently. (gates)

  PIG-12: Added time stamps to log4j messages (phunt via gates).

  PIG-44: Added adaptive decision of the number of records to hold in memory 
	before spilling (utkarsh)

  PIG-56: Made DataBag implement Iterable. (groves via gates)

  PIG-39: created more efficient version of read (spullara via olgan)

  PIG-32: ABstraction layer (olgan)

  PIG-83: Change everything except grunt and Main (PigServer on down) to use
	common logging abstraction instead of log4j.  By default in grunt, log4j
	still used as logging layer.  Also converted all System.out/err.println
	statements to use logging instead. (francisoud via gates)

  PIG-13: adding version to the system (joa23 via olgan)

  PIG-113:  Make explain output more understandable (pi_song via gates)

  PIG-120:  Support map reduce in local mode.  To do this user needs to
    specify execution type as mapreduce and cluster name as local (joa23 via gates).

  PIG-106:  Change StringBuffer and String '+' to StringBuilder (francisoud via gates).

  PIG-111: Reworked configuration to be setable via properties. (joa23, pi_song, oae via gates).
      
  BUG FIXES
  	PIG-24 Files that were incorrectly placed under test/reports have been
	removed.  ant clean now cleans test/reports.  (milindb via gates)

	PIG-25 com.yahoo.pig dir left under pig/test by mistake. removed it (olgan@)

	PIG-23 Made pig work with java 1.5. (milindb via gates)

	PIG-17 integrated with Hadoop 0.15 (olgan@)

	PIG-33 Help was commented out - uncommented (olgan)

	PIG-31: second half of concurrent mode problem addressed (olgan)

	PIG-14: added heartbeat functionality (olgan)

	PIG-17: updated hadoop15.jar to match hadoop 0.15.1 release

	PIG-29: fixed bag factory to be properly initialized (utkarsh)

    PIG-43: fixed problem where using the combiner prevented a pig alias
    from being evaluated more than once. (gates)

    PIG-45: Fixed pig.pl to not assume hodrc file is named the same as
    cluster name (gates).

    PIG-7 (more): Fixed bug in PigCombiner where it was writing IndexedTuples
    instead of Tuples, causing Reducer to crash in some cases.

    PIG-41: Added patterns to svn:ignore

    PIG-51: Fixed combiner in the presence of flattening

	PIG-61: Fixed MapreducePlanCompiler to use PigContext to load up the
	comparator function instead of Class.forName.  (gates)

	PIG-63: Fix for non-ascii UTF-8 data (breed@ and olgan@)

	PIG-77: Added eclipse specific files to svn:ignore

	PIG-57: Fixed NPE in PigContext.fixUpDomain (francisoud via gates)

	PIG-69: NPE in PigContext.setJobtrackerLocation (francisoud via gates)

	PIG-78: src/org/apache/pig/builtin/PigStorage.java doesn't compile (arun
	via olgan)

	PIG-87: Fix pig.pl to find java via JAVA_HOME instead of hardcoded default
	path.  Also fix it to not die if pigclient.conf is missing. (craigm via
	gates).

	PIG-89: Fix DefaultDataBag, DistinctDataBag, SortedDataBag to close spill
	files when they are done spilling (contributions by craigm, breed, and
	gates, committed by gates).

	PIG-95: Remove System.exit() statements from inside pig (joa23 via gates).

	PIG-65: convert tabs to spaces (groves via olgan)

	PIG-97: Turn off combiner in the case of Cogroup, as it doesn't work when
	more than one bag is involved (gates).

	PIG-92: Fix NullPointerException in PIgContext due to uninitialized conf
	reference. (francisoud via gates)

	PIG-80: In a number of places stack trace information was being lost by an
	exception being caught, and a different exception then thrown.  All those
	locations have been changed so that the new exception now wraps the old.
	(francisoud via gates).

	PIG-84: Converted printStackTrace calls to calls to the logger.
	(francisoud via gates).

	PIG-88: Remove unused HadoopExe import from Main.  (pi_song via gates).

	PIG-99: Fix to make unit tests not run out of memory. (francisoud via
	gates).

    PIG-107: enabled several tests. (francisoud via olgan)

    PIG-46: abort processing on error for non-interactive mode (olston via
    olgan)

    PIG-109: improved exception handling (oae via olgan)

	PIG-72: Move unit tests to use MiniDFS and MiniMR so that unit tests can
	be run w/o access to a hadoop cluster. (xuzh via gates)

    PIG-68: improvements to build.xml (joa23 via olgan)

	PIG-110: Replaced code accidently merged out in PIG-32 fix that handled
	flattening the combiner case. (gates and oae)

    PIG-213: Remove non-static references to logger from data bags and tuples, 
    as it causes significant overhead (vgeschel via gates).

    PIG-284: target for building source jar (oae via olgan)