[PIG-2288] Pig 0.9 error message not useful as compared to 0.8 in case of group by

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 0.10.0
• Assignee: Vivek Padmanabhan
• Reporter: Vivek Padmanabhan
• Created: 16/Sep/11 06:42
• Updated: 26/Apr/12 20:33
• Resolved: 12/Oct/11 18:24

Description

Another instance of change in error message from 0.8 to 0.9.This time in group by statement. In 0.8 the error message is proper while 0.9 returns NullPointer

A = LOAD 'i1' as (f1:chararray,f2:chararray);
B = GROUP B by f1;
C = foreach B generate group as f1, COUNT(A);
dump C;

Error message from 0.8
ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error during parsing. Unrecognized alias B

Error message from 0.9
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during parsing. null
at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1652)
at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1597)
at org.apache.pig.PigServer.registerQuery(PigServer.java:583)
at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:942)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:188)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:164)
at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:81)
at org.apache.pig.Main.run(Main.java:553)
at org.apache.pig.Main.main(Main.java:108)
Caused by: Failed to parse: null
at org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:180)
at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1644)
... 9 more
Caused by: java.lang.NullPointerException
at org.apache.pig.parser.LogicalPlanGenerator.alias_col_ref(LogicalPlanGenerator.java:12990)
at org.apache.pig.parser.LogicalPlanGenerator.col_ref(LogicalPlanGenerator.java:12854)
at org.apache.pig.parser.LogicalPlanGenerator.projectable_expr(LogicalPlanGenerator.java:7789)
at org.apache.pig.parser.LogicalPlanGenerator.var_expr(LogicalPlanGenerator.java:7549)
at org.apache.pig.parser.LogicalPlanGenerator.expr(LogicalPlanGenerator.java:6959)
at org.apache.pig.parser.LogicalPlanGenerator.join_group_by_expr(LogicalPlanGenerator.java:10580)
at org.apache.pig.parser.LogicalPlanGenerator.join_group_by_clause(LogicalPlanGenerator.java:10416)
at org.apache.pig.parser.LogicalPlanGenerator.group_item(LogicalPlanGenerator.java:4727)
at org.apache.pig.parser.LogicalPlanGenerator.group_clause(LogicalPlanGenerator.java:4345)
at org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1020)
at org.apache.pig.parser.LogicalPlanGenerator.general_statement(LogicalPlanGenerator.java:638)
at org.apache.pig.parser.LogicalPlanGenerator.statement(LogicalPlanGenerator.java:459)
at org.apache.pig.parser.LogicalPlanGenerator.query(LogicalPlanGenerator.java:357)
at org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:171)
... 10 more

Checked this case with latest code in trunk and patch from PIG-2238, the message is still improper.