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Class org.apache.pig.PigConstants

Added Fields
String PIG_EXEC_OLD_PART_FILTER_OPTIMIZER flag to use old PartitionFilterOptimizer in case NewPartitionFilterOptimizer is not backwards compatible (A known case is "filter a by 1 == 0").
String PIG_OPTIMIZER_RULES_DISABLED_KEY {@value} is a comma-separated list of optimizer rules to disable; by default all rules are enabled.