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QuestDB is high performance SQL time series database

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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions.conditional;

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.PlanSink;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BinaryFunction;
import io.questdb.griffin.engine.functions.IPv4Function;
import io.questdb.std.IntList;
import io.questdb.std.Numbers;
import io.questdb.std.ObjList;

public class NullIfIPv4FunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "nullif(XS)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        return new NullIfIPv4FunctionFactory.NullIfIPv4Function(args.getQuick(0), args.getQuick(1));
    }

    private static class NullIfIPv4Function extends IPv4Function implements BinaryFunction {
        private final Function arg1;
        private final Function arg2;

        public NullIfIPv4Function(Function arg1, Function arg2) {
            this.arg1 = arg1;
            this.arg2 = arg2;
        }

        @Override
        public int getIPv4(Record rec) {
            return arg1.getIPv4(rec) == arg2.getIPv4(rec) ? Numbers.IPv4_NULL : arg1.getIPv4(rec);
        }

        @Override
        public Function getLeft() {
            return arg1;
        }

        @Override
        public Function getRight() {
            return arg2;
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val("nullif(").val(arg1).val(',').val(arg2).val(')');
        }
    }
}