Need a easy way to bind to external Java library functions that require object
constructors such as Apache Commons Math library
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Key: PIG-1678
URL: https://issues.apache.org/jira/browse/PIG-1678
Project: Pig
Issue Type: New Feature
Reporter: David Ciemiewicz
I would like to have a trivial way to bind and invoke Java library functions
from within Pig without creating wrapper functions in Java.
For instance, I need functions out of the Apache Commons Math library
(http://commons.apache.org/math/) such as
BetaDistributionImpl.cumulativeProbability.
I would like to be able to specify Pig a pig binding of:
{code}
register commons-math-2.1.jar;
define (new org.apache.commons.math.distribution.BetaDistributionImpl((double)
alpha, (double) beta)).cumulativeProbability((double) x) BetaIncomplete(x,
alpha, beta)
{code}
What is special about BetaDistributionImpl is that I must first construct an
object instance with parameters of alpha and beta, then I need to invoke the
object method cumulativeProbability to compute my function.
This requires about 100 lines of Java code to create a wrapper just to this one
function instance. And there are something like 1000 functions to bind to.
Better yet, if I could just say something like:
{code}
register commons-math-2.1.jar;
import org.apache.commons.math.distribution.BetaDistributionImpl as BetaDist;
B = foreach A as
alpha,
beta,
x,
BetaDist(alpha,beta).cumulativeProbability(x) as prob;
{code}
Ideally I'd be able to register or include a list of all the bindings to the
library without ever having write another Eval func wrapper.
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