be/src/vec/aggregate_functions/aggregate_function_sequence_match.cpp

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// 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
//
//   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
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// under the License.

#include "vec/aggregate_functions/aggregate_function_sequence_match.h"

#include <boost/iterator/iterator_facade.hpp>

#include "common/logging.h"
#include "vec/aggregate_functions/aggregate_function_simple_factory.h"
#include "vec/aggregate_functions/helpers.h"
#include "vec/data_types/data_type.h"

namespace doris::vectorized {
#include "common/compile_check_begin.h"

template <template <PrimitiveType> typename AggregateFunction>
AggregateFunctionPtr create_aggregate_function_sequence_base(const std::string& name,
                                                             const DataTypes& argument_types,
                                                             const DataTypePtr& result_type,
                                                             const bool result_is_nullable,
                                                             const AggregateFunctionAttr& attr) {
    const auto arg_count = argument_types.size();

    if (arg_count < 4) {
        LOG(WARNING) << "Aggregate function " + name + " requires at least 4 arguments.";
        return nullptr;
    }
    if (arg_count - 2 > MAX_EVENTS) {
        LOG(WARNING) << "Aggregate function " + name + " supports up to " +
                                std::to_string(MAX_EVENTS) + " event arguments.";
        return nullptr;
    }

    switch (argument_types[1]->get_primitive_type()) {
    case TYPE_DATETIMEV2:
        return creator_without_type::create<AggregateFunction<TYPE_DATETIMEV2>>(
                argument_types, result_is_nullable, attr);
    case TYPE_DATEV2:
        return creator_without_type::create<AggregateFunction<TYPE_DATEV2>>(
                argument_types, result_is_nullable, attr);
    default:
        return nullptr;
    }
}

void register_aggregate_function_sequence_match(AggregateFunctionSimpleFactory& factory) {
    factory.register_function_both(
            "sequence_match",
            create_aggregate_function_sequence_base<AggregateFunctionSequenceMatch>);
    factory.register_function_both(
            "sequence_count",
            create_aggregate_function_sequence_base<AggregateFunctionSequenceCount>);
}
} // namespace doris::vectorized