[PIG-1694] union-onschema projects null schema at parsing stage for some queries

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.0
• Hadoop Flags: Reviewed
• Assignee: Thejas Nair
• Reporter: Thejas Nair
• Created: 22/Oct/10 21:39
• Updated: 17/Dec/10 22:46
• Resolved: 28/Oct/10 00:50

Description

If the input relations of union-onschema have different aliases in the schemas, a subsequent statement that refers to a column alias in the union fails.

eg

grunt> l1 = load 'x' as (a);   
grunt> l2 = load 'x' as (a,b); 
grunt> u = union onschema l1,l2;
grunt> o = order u by a;        
2010-10-22 14:33:56,086 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1000: Error during parsing. Invalid alias: a in null
Details at logfile: /Users/tejas/pig-0.8/branch-0.8/pig_1287783217811.log