support union operation that merges based on column names
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Key: PIG-1461
URL: https://issues.apache.org/jira/browse/PIG-1461
Project: Pig
Issue Type: New Feature
Components: impl
Affects Versions: 0.8.0
Reporter: Thejas M Nair
Fix For: 0.8.0
When the data has schema, it often makes sense to union on column names in
schema rather than the position of the columns.
The behavior of existing union operator should remain backward compatible .
This feature can be supported using either a new operator or extending union to
support 'using' clause . I am thinking of having a new operator called either
unionschema or merge . Does anybody have any other suggestions for the syntax ?
example -
L1 = load 'x' as (a,b);
L2 = load 'y' as (b,c);
U = unionschema L1, L2;
describe U;
U: {a:bytearray, b:byetarray, c:bytearray}
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