io.questdb.griffin.engine.functions.eq.EqByteFunctionFactory Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 QuestDB
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 *  you may not use this file except in compliance with the License.
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 *  http://www.apache.org/licenses/LICENSE-2.0
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.eq;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BinaryFunction;
import io.questdb.griffin.engine.functions.NegatableBooleanFunction;
import io.questdb.griffin.engine.functions.constants.BooleanConstant;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

public class EqByteFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "=(BB)";
    }

    @Override
    public boolean isBoolean() {
        return true;
    }

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) {
        if (args.getQuick(0).isNullConstant() || args.getQuick(1).isNullConstant()) {
            return BooleanConstant.FALSE;
        }
        return new Func(args.getQuick(0), args.getQuick(1));
    }

    private static class Func extends NegatableBooleanFunction implements BinaryFunction {
        private final Function left;
        private final Function right;

        public Func(Function left, Function right) {
            this.left = left;
            this.right = right;
        }

        @Override
        public boolean getBool(Record rec) {
            return negated != (left.getByte(rec) == right.getByte(rec));
        }

        @Override
        public Function getLeft() {
            return left;
        }

        @Override
        public Function getRight() {
            return right;
        }
    }
}