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State values and custom data types are converted to string values, if they are mismatched.

Three-value logic for null values


running  running environment has been augmented to use three-value logic for null values.


If a null value was compared to a null value in the

running environment:

  • In Release 3.0 and earlier, this evaluated to true.
  • In Release 3.1 and later, this evaluates to an unknown (null) value.


In Release 3.0, this expression generated b for all inputs on the

running environment and a null value on Hadoop Pig.