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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file 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 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
package org.apache.pig;
public class PigConstants {
    private PigConstants() {
        throw new IllegalStateException();

This key is used in the job conf to let the various jobs know what code was generated.
    public static final String GENERATED_CLASSES_KEY = "pig.schematuple.classes";

This key is used when a job is run in local mode to pass the location of the generated code from the front-end to the "back-end" (which, in this case, is in the same JVM).
    public static final String LOCAL_CODE_DIR = "pig.schematuple.local.dir";
    // This makes it easy to turn SchemaTuple on globally.
    public static final boolean SCHEMA_TUPLE_ON_BY_DEFAULT = false;

is a comma-separated list of optimizer rules to disable; by default, all rules are enabled.
    public static final String PIG_OPTIMIZER_RULES_DISABLED_KEY = "pig.optimizer.rules.disabled";

flag to use old PartitionFilterOptimizer in case NewPartitionFilterOptimizer is not backwards compatible (A known case is "filter a by 1 == 0").
    public static final String PIG_EXEC_OLD_PART_FILTER_OPTIMIZER = "pig.exec.useOldPartitionFilterOptimizer";
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