[Pig Wiki] Update of "PigErrorHandlingFunctionalSpecification" by SanthoshSrinivasan

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

The comment on the change is:
Added new error codes

------------------------------------------------------------------------------
  ||1098||Node index cannot be negative.||
  ||1099||Node to be replaced cannot be null.||
  ||1100||Replacement node cannot be null.||
- ||1101||PushUpFilter invoked with an invalid operator class name: <operatorClassName>||
  ||2000||Internal error. Mismatch in group by arities. Expected: <schema>. Found: <schema>||
  ||2001||Unable to clone plan before compiling||
  ||2002||The output file(s): <filename>  already exists||
@@ -353, +352 @@

  ||2149||Internal error while trying to check if filters can be pushed up.||
  ||2150||Internal error. The push before input is not set.||
  ||2151||Internal error while pushing filters up.||
+ ||2152||Internal error while trying to check if foreach with flatten can be pushed down.||
+ ||2153||Internal error. The mapping for the flattened columns is empty||
+ ||2154||Internal error. Schema of successor cannot be null for pushing down foreach with flatten.||
+ ||2155||Internal error while pushing foreach with flatten down.||
+ ||2156||Error while fixing projections. Projection map of node to be replaced is null.||
+ ||2157||Error while fixing projections. No mapping available in old predecessor to replace column.||
+ ||2158||Error during fixing projections. No mapping available in old predecessor for column to be replaced.||
+ ||2159||Error during fixing projections. Could not locate replacement column from the old predecessor.||
+ ||2160||Error during fixing projections. Projection map of new predecessor is null.||
+ ||2161||Error during fixing projections. No mapping available in new predecessor to replace column.||
+ ||2162||Error during fixing projections. Could not locate mapping for column <column>  in new predecessor.||
+ ||2163||Error during fixing projections. Could not locate replacement column for column: <column> in the new predecessor.||
  ||2998||Unexpected internal error.||
  ||2999||Unhandled internal error.||
  ||4000||The output file(s): <filename>  already exists||