io.questdb.griffin.engine.functions.bool.InStrFunctionFactory 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,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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package io.questdb.griffin.engine.functions.bool;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.ColumnType;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.SymbolTableSource;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BooleanFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.griffin.engine.functions.constants.BooleanConstant;
import io.questdb.std.CharSequenceHashSet;
import io.questdb.std.Chars;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

public class InStrFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "in(Sv)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) throws SqlException {
        int n = args.size();
        if (n == 1) {
            return BooleanConstant.FALSE;
        }
        ObjList deferredValues = null;

        final CharSequenceHashSet set = new CharSequenceHashSet();
        for (int i = 1; i < n; i++) {
            Function func = args.getQuick(i);
            switch (ColumnType.tagOf(func.getType())) {
                case ColumnType.NULL:
                case ColumnType.STRING:
                case ColumnType.SYMBOL:
                    if (func.isRuntimeConstant()) {//bind variables
                        if (deferredValues == null) {
                            deferredValues = new ObjList<>();
                        }
                        deferredValues.add(func);
                        continue;
                    }
                    CharSequence value = func.getStr(null);
                    if (value == null) {
                        set.addNull();
                    }
                    set.add(Chars.toString(value));
                    break;
                case ColumnType.CHAR:
                    set.add(String.valueOf(func.getChar(null)));
                    break;
                default:
                    throw SqlException.$(argPositions.getQuick(i), "STRING constant expected");
            }
        }
        final Function var = args.getQuick(0);
        if (var.isConstant() && deferredValues == null) {
            return BooleanConstant.of(set.contains(var.getStr(null)));
        }
        return new Func(var, set, deferredValues);
    }

    private static class Func extends BooleanFunction implements UnaryFunction {
        private final Function arg;
        private final CharSequenceHashSet deferredSet;
        private final ObjList deferredValues;
        private final CharSequenceHashSet set;

        public Func(Function arg, CharSequenceHashSet set, ObjList deferredValues) {
            this.arg = arg;
            this.set = set;
            this.deferredValues = deferredValues;
            this.deferredSet = deferredValues != null ? new CharSequenceHashSet() : null;
        }

        @Override
        public Function getArg() {
            return arg;
        }

        @Override
        public boolean getBool(Record rec) {
            CharSequence val = arg.getStr(rec);
            return set.contains(val) ||
                    (deferredSet != null && deferredSet.contains(val));
        }

        @Override
        public void init(SymbolTableSource symbolTableSource, SqlExecutionContext executionContext) throws SqlException {
            arg.init(symbolTableSource, executionContext);
            if (deferredValues != null) {
                deferredSet.clear();
                for (int i = 0, n = deferredValues.size(); i < n; i++) {
                    Function func = deferredValues.getQuick(i);
                    func.init(symbolTableSource, executionContext);
                    deferredSet.add(func.getStr(null));
                }
            }
        }

        @Override
        public void toPlan(PlanSink sink) {
            if (deferredValues != null) {
                sink.val('(');
            }
            sink.val(arg).val(" in ").val(set);
            if (deferredValues != null) {
                sink.val(" or ").val(arg).val(" in ").val(deferredValues).val(')');
            }
        }
    }
}