org.apache.pig.builtin.Nondeterministic Maven / Gradle / Ivy
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* distributed with this work for additional information
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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*/
package org.apache.pig.builtin;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import org.apache.pig.classification.InterfaceAudience;
import org.apache.pig.classification.InterfaceStability;
/**
* A non-deterministic UDF is one that can produce different results when
* invoked on the same input. Examples of non-deterministic behavior might be,
* for example, getCurrentTime() or random().
* Certain Pig optimizations depend on UDFs being deterministic. It is therefore
* very important for correctness that non-deterministic UDFs be annotated as such.
*/
@InterfaceAudience.Public
@InterfaceStability.Unstable
@Documented
@Retention(value=RetentionPolicy.RUNTIME)
public @interface Nondeterministic {
}