io.questdb.griffin.engine.functions.window.BaseDoubleWindowFunction Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2023 QuestDB
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 *  Licensed 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
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.window;

import io.questdb.cairo.ArrayColumnTypes;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.ScalarFunction;
import io.questdb.cairo.sql.SymbolTableSource;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.DoubleFunction;
import io.questdb.griffin.engine.orderby.RecordComparatorCompiler;
import io.questdb.griffin.engine.window.WindowFunction;
import io.questdb.std.IntList;

abstract class BaseDoubleWindowFunction extends DoubleFunction implements WindowFunction, ScalarFunction {
    protected final Function arg;
    protected int columnIndex;

    public BaseDoubleWindowFunction(Function arg) {
        this.arg = arg;
    }

    @Override
    public void close() {
        arg.close();
    }

    @Override
    public double getDouble(Record rec) {
        //unused
        throw new UnsupportedOperationException();
    }

    @Override
    public abstract String getName();

    @Override
    public void init(SymbolTableSource symbolTableSource, SqlExecutionContext executionContext) throws SqlException {
        super.init(symbolTableSource, executionContext);
        arg.init(symbolTableSource, executionContext);
    }

    @Override
    public void initRecordComparator(RecordComparatorCompiler recordComparatorCompiler, ArrayColumnTypes chainTypes, IntList order) {
    }

    @Override
    public void reset() {

    }

    @Override
    public void setColumnIndex(int columnIndex) {
        this.columnIndex = columnIndex;
    }

    @Override
    public void toPlan(PlanSink sink) {
        sink.val(getName());
        sink.val('(').val(arg).val(')');
        sink.val(" over ()");
    }

    @Override
    public void toTop() {
        arg.toTop();
    }
}