Sample/Limit should take scalar
-------------------------------
Key: PIG-1926
URL: https://issues.apache.org/jira/browse/PIG-1926
Project: Pig
Issue Type: Improvement
Reporter: Daniel Dai
Currently, Limit, Sample only takes a constant. It would be better we can use a
scalar in the place of constant. Eg:
{code}
a = load 'a.txt';
b = group a by all;
c = foreach b generate COUNT(*) as sum;
d = order a by $0;
e = limit d c.sum/100;
{code}
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