Improve error messages in new parser
------------------------------------
Key: PIG-1921
URL: https://issues.apache.org/jira/browse/PIG-1921
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.9.0
Reporter: Richard Ding
Assignee: Xuefu Zhang
Fix For: 0.9.0
The new parser gives better error messages than the old parser (especially with
the line numbers). But there are still some places where the error messages can
be improved.
Example:
{code}
ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1025: Invalid field projection.
Projected field [E::v] does not exist in schema:
A::v#28:long,A::u#29:chararray,A::w#30:bytearray,B::v#31:long,B::u#32:chararray,B::w#33:bytearray.
{code}
In this case the #num should be removed from the schema.
Example:
{code}
ERROR org.apache.pig.tools.grunt.Grunt - ERROR 0: line 5:34 mismatched input
[''reg''] expecting set null
{code}
In this case the parser detects the error early and gives the line number, but
missing the reason part from the old parser message:
{code}
ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error during parsing. Only
COLLECTED, REGULAR or MERGE are valid GROUP modifiers.
{code}
Example:
{code}
grunt> C = join A by v, B by A.t;
2011-03-18 14:04:38,441 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
0: Invalid scalar projection: A
{code}
In this case the real reason is t is not a field of A : {v: int, u:int}. So the
message should be: Invalid scalar projection: A.t
Example:
{code}
C = join A by v, B by B::A.v;
2011-03-18 14:40:11,590 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
1000: Invalid field reference. Referenced field [v] does not exist in schema:
null.
{code}
The message here is not clear and the schema shouldn't be null.
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