[Pig Wiki] Update of "PigErrorHandlingFunctionalSpecification" by BenjaminReed

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The following page has been changed by BenjaminReed:
http://wiki.apache.org/pig/PigErrorHandlingFunctionalSpecification

The comment on the change is:
Added handle errors column to the error table. Added instructions for error 2056

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     1. -wagg to turn on warning aggregation; by default warning aggregation is turned off.
     2. -v to include printing error messages on screen; by default error messages will be written to client side log. Using -v will also print the messages on the screen
-    3. -l directory where the client side log is stored; by default, logs will be stored in the current working directory and named pig_<datestamp>.log. When used in batch mode (i.e., when a script to be executed is provided), the log file name will also contain the name of the script - pig_<datestam>_<pig_file>.log.
+    3. [[Anchor(clientSideLog)]]-l directory where the client side log is stored; by default, logs will be stored in the current working directory and named pig_<datestamp>.log. When used in batch mode (i.e., when a script to be executed is provided), the log file name will also contain the name of the script - pig_<datestam>_<pig_file>.log.
  
  
  == Compendium of error messages ==
  
  A list of possible error messages is listed below. This list is not comprehensive and will be modified to reflect the true error message along with the error code.
  
- ||'''Error Code'''||'''Error Message'''||
+ ||'''Error Code'''||'''Error Message'''||'''How to Handle'''||
  ||1000||Error during parsing||
  ||1001||Unable to descirbe schema for alias <alias>||
  ||1002||Unable to store alias <id>||
@@ -256, +256 @@

  ||2053||Internal error. Did not find roots in the physical plan.||
  ||2054||Internal error. Could not convert <object> to <Integer/Long/Float/Double/Tuple/Bag/Map>||
  ||2055||Did not find exception name to create exception from string: <string> ||
- ||2056||Cannot create exception from empty string.||
+ ||2056||Cannot create exception from empty string.||Pig could not find an exception in the error messages from Hadoop, examine the [#clideSideLog client log] to find more information.||
  ||2057||Did not find fully qualified method name to reconstruct stack trace: <line> ||
  ||2058||Unable to set index on the newly created POLocalRearrange.||
  ||2059||Problem with inserting cast operator for <regular expression/binary conditional/unary operator/user defined function/fragment replicate join/cogroup/project/<operator>> in plan.||