// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// 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

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#include "exprs/vbloom_predicate.h"

#include <cstddef>

#include <utility>

#include "common/status.h"

#include "core/block/block.h"

#include "core/block/column_numbers.h"

#include "core/block/column_with_type_and_name.h"

#include "core/column/column.h"

#include "core/column/column_nullable.h"

#include "core/column/column_vector.h"

#include "core/data_type/data_type.h"

#include "core/data_type/data_type_nullable.h"

#include "core/types.h"

#include "exprs/bloom_filter_func.h"

#include "exprs/expr_zonemap_filter.h"

#include "exprs/vslot_ref.h"

#include "runtime/runtime_state.h"

namespace doris {

class RowDescriptor;

class TExprNode;

} // namespace doris

namespace doris {

class VExprContext;

VBloomPredicate::VBloomPredicate(const TExprNode& node) : VExpr(node), _filter(nullptr) {}

Status VBloomPredicate::prepare(RuntimeState* state, const RowDescriptor& desc,

                                VExprContext* context) {

    RETURN_IF_ERROR_OR_PREPARED(VExpr::prepare(state, desc, context));

    if (_children.size() != 1) {

        return Status::InternalError("Invalid argument for VBloomPredicate.");

    }

    _prepare_finished = true;

    return Status::OK();

}

Status VBloomPredicate::open(RuntimeState* state, VExprContext* context,

                             FunctionContext::FunctionStateScope scope) {

    DCHECK(_prepare_finished);

    RETURN_IF_ERROR(VExpr::open(state, context, scope));

    _open_finished = true;

    return Status::OK();

}

void VBloomPredicate::close(VExprContext* context, FunctionContext::FunctionStateScope scope) {

    VExpr::close(context, scope);

}

Status VBloomPredicate::_do_execute(VExprContext* context, const Block* block,

                                    const uint8_t* __restrict filter, const Selector* selector,

                                    size_t count, ColumnPtr& result_column) const {

    DCHECK(_open_finished || block == nullptr);

    DCHECK(!(filter != nullptr && selector != nullptr))

            << "filter and selector can not be both set";

    DCHECK_EQ(_children.size(), 1);

    ColumnPtr argument_column;

    RETURN_IF_ERROR(_children[0]->execute_column(context, block, selector, count, argument_column));

    argument_column = argument_column->convert_to_full_column_if_const();

    size_t sz = argument_column->size();

    auto res_data_column = ColumnUInt8::create(sz);

    res_data_column->resize(sz);

    auto* ptr = ((ColumnUInt8*)res_data_column.get())->get_data().data();

    _filter->find_fixed_len(argument_column, ptr, filter);

    result_column = std::move(res_data_column);

    DCHECK_EQ(result_column->size(), count);

    return Status::OK();

}

Status VBloomPredicate::execute_column_impl(VExprContext* context, const Block* block,

                                            const Selector* selector, size_t count,

                                            ColumnPtr& result_column) const {

    return _do_execute(context, block, nullptr, selector, count, result_column);

}

Status VBloomPredicate::execute_runtime_filter(VExprContext* context, const Block* block,

                                               const uint8_t* __restrict filter, size_t count,

                                               ColumnPtr& result_column,

                                               ColumnPtr* arg_column) const {

    return _do_execute(context, block, filter, nullptr, count, result_column);

}

namespace {

bool bloom_filter_type_matches(PrimitiveType filter_type, const DataTypePtr& data_type) {

    if (data_type == nullptr) {

        return false;

    }

    const auto value_type = remove_nullable(data_type)->get_primitive_type();

    return filter_type == value_type || (is_string_type(filter_type) && is_string_type(value_type));

}

} // namespace

bool VBloomPredicate::can_execute_on_raw_fixed_values(const DataTypePtr& data_type,

                                                      int column_id) const {

    if (_filter == nullptr || !_filter->supports_raw_fixed_values() || _children.size() != 1) {

        return false;

    }

    const auto slot = std::dynamic_pointer_cast<VSlotRef>(_children[0]);

    return slot != nullptr && slot->column_id() == column_id &&

           bloom_filter_type_matches(_filter->primitive_type(), slot->data_type()) &&

           bloom_filter_type_matches(_filter->primitive_type(), data_type);

}

Status VBloomPredicate::execute_on_raw_fixed_values(const uint8_t* values, size_t num_values,

                                                    size_t value_width,

                                                    const DataTypePtr& data_type, int column_id,

                                                    uint8_t* matches) const {

    if (!can_execute_on_raw_fixed_values(data_type, column_id)) {

        return Status::NotSupported("Bloom predicate cannot evaluate raw fixed-width values");

    }

    // Hash physical values inside BloomFilterFunc<T>; reconstructing an untyped hash here could

    // disagree with the build-side hash for dates, decimals, and other fixed-width wrappers.

    return _filter->find_batch_raw_fixed(values, num_values, value_width, matches);

}

ZoneMapFilterResult VBloomPredicate::evaluate_dictionary_filter(

        const DictionaryEvalContext& ctx) const {

    if (!can_evaluate_dictionary_filter()) {

        return ZoneMapFilterResult::kUnsupported;

    }

    const auto slot = std::dynamic_pointer_cast<VSlotRef>(_children[0]);

    DORIS_CHECK(slot != nullptr);

    const auto* dictionary = ctx.slot(slot->column_id());

    if (dictionary == nullptr ||

        !bloom_filter_type_matches(_filter->primitive_type(), dictionary->data_type)) {

        return ZoneMapFilterResult::kUnsupported;

    }

    for (const auto& value : dictionary->values) {

        if (_filter->test_field(value)) {

            return ZoneMapFilterResult::kMayMatch;

        }

    }

    return ZoneMapFilterResult::kNoMatch;

}

bool VBloomPredicate::can_evaluate_dictionary_filter() const {

    if (_filter == nullptr || _children.size() != 1) {

        return false;

    }

    const auto slot = std::dynamic_pointer_cast<VSlotRef>(_children[0]);

    return slot != nullptr &&

           bloom_filter_type_matches(_filter->primitive_type(), slot->data_type());

}

const std::string& VBloomPredicate::expr_name() const {

    return EXPR_NAME;

}

void VBloomPredicate::set_filter(std::shared_ptr<BloomFilterFuncBase> filter) {

    _filter = filter;

}

uint64_t VBloomPredicate::get_digest(uint64_t seed) const {

    seed = _children[0]->get_digest(seed);

    if (seed) {

        char* data;

        int len;

        _filter->get_data(&data, &len);

        return HashUtil::hash64(data, len, seed);

    }

    return 0;

}

} // namespace doris