HuaHuaY commented on code in PR #403: URL: https://github.com/apache/iceberg-cpp/pull/403#discussion_r2597687297
########## src/iceberg/expression/manifest_evaluator.cc: ########## @@ -0,0 +1,397 @@ +/* + * 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 "iceberg/expression/manifest_evaluator.h" + +#include "iceberg/expression/binder.h" +#include "iceberg/expression/expression_visitor.h" +#include "iceberg/expression/rewrite_not.h" +#include "iceberg/manifest/manifest_list.h" +#include "iceberg/row/struct_like.h" +#include "iceberg/schema.h" +#include "iceberg/util/macros.h" + +namespace iceberg { + +namespace { +constexpr bool kRowsMightMatch = true; +constexpr bool kRowCannotMatch = false; +constexpr int32_t kInPredicateLimit = 200; +} // namespace + +class ManifestEvalVisitor : public BoundVisitor<bool> { + public: + explicit ManifestEvalVisitor(const ManifestFile& manifest) + : stats_(manifest.partitions) {} + + Result<bool> AlwaysTrue() override { return true; } + + Result<bool> AlwaysFalse() override { return false; } + + Result<bool> Not(bool child_result) override { return !child_result; } + + Result<bool> And(bool left_result, bool right_result) override { + return left_result && right_result; + } + + Result<bool> Or(bool left_result, bool right_result) override { + return left_result || right_result; + } + + Result<bool> IsNull(const std::shared_ptr<Bound>& expr) override { + // no need to check whether the field is required because binding evaluates that case + // if the column has no null values, the expression cannot match + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + if (!stats_.at(pos).contains_null) { + return kRowCannotMatch; + } + + return kRowsMightMatch; + } + + Result<bool> NotNull(const std::shared_ptr<Bound>& expr) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + if (AllValuesAreNull(stats_.at(pos), ref->type()->type_id())) { + return kRowCannotMatch; + } + + return kRowsMightMatch; + } + + Result<bool> IsNaN(const std::shared_ptr<Bound>& expr) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + if (stats_.at(pos).contains_nan.has_value() && !stats_.at(pos).contains_nan.value()) { + return kRowCannotMatch; + } + if (AllValuesAreNull(stats_.at(pos), ref->type()->type_id())) { + return kRowCannotMatch; + } + + return kRowsMightMatch; + } + + Result<bool> NotNaN(const std::shared_ptr<Bound>& expr) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + const auto& summary = stats_.at(pos); + // if containsNaN is true, containsNull is false and lowerBound is null, all values + // are NaN + if (summary.contains_nan.has_value() && summary.contains_nan.value() && + !summary.contains_null && !summary.lower_bound.has_value()) { + return kRowCannotMatch; + } + + return kRowsMightMatch; + } + + Result<bool> Lt(const std::shared_ptr<Bound>& expr, const Literal& lit) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + const auto& summary = stats_.at(pos); + if (!summary.lower_bound.has_value()) { + return kRowCannotMatch; // values are all null + } + ICEBERG_ASSIGN_OR_RAISE( + auto lower, DeserializeBoundLiteral(summary.lower_bound.value(), ref->type())); + if (lower >= lit) { + return kRowCannotMatch; + } + return kRowsMightMatch; + } + + Result<bool> LtEq(const std::shared_ptr<Bound>& expr, const Literal& lit) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + const auto& summary = stats_.at(pos); + if (!summary.lower_bound.has_value()) { + return kRowCannotMatch; // values are all null + } + ICEBERG_ASSIGN_OR_RAISE( + auto lower, DeserializeBoundLiteral(summary.lower_bound.value(), ref->type())); + if (lower > lit) { + return kRowCannotMatch; + } + return kRowsMightMatch; + } + + Result<bool> Gt(const std::shared_ptr<Bound>& expr, const Literal& lit) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + const auto& summary = stats_.at(pos); + if (!summary.upper_bound.has_value()) { + return kRowCannotMatch; // values are all null + } + ICEBERG_ASSIGN_OR_RAISE( + auto upper, DeserializeBoundLiteral(summary.upper_bound.value(), ref->type())); + if (upper <= lit) { + return kRowCannotMatch; + } + return kRowsMightMatch; + } + + Result<bool> GtEq(const std::shared_ptr<Bound>& expr, const Literal& lit) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + const auto& summary = stats_.at(pos); + if (!summary.upper_bound.has_value()) { + return kRowCannotMatch; // values are all null + } + ICEBERG_ASSIGN_OR_RAISE( + auto upper, DeserializeBoundLiteral(summary.upper_bound.value(), ref->type())); + if (upper < lit) { + return kRowCannotMatch; + } + return kRowsMightMatch; + } + + Result<bool> Eq(const std::shared_ptr<Bound>& expr, const Literal& lit) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + const auto& summary = stats_.at(pos); + if (!summary.lower_bound.has_value() || !summary.upper_bound.has_value()) { + return kRowCannotMatch; // values are all null and literal cannot contain null + } + ICEBERG_ASSIGN_OR_RAISE( + auto lower, DeserializeBoundLiteral(summary.lower_bound.value(), ref->type())); + if (lower > lit) { + return kRowCannotMatch; + } + + ICEBERG_ASSIGN_OR_RAISE( + auto upper, DeserializeBoundLiteral(summary.upper_bound.value(), ref->type())); + if (upper < lit) { + return kRowCannotMatch; + } + + return kRowsMightMatch; + } + + Result<bool> NotEq(const std::shared_ptr<Bound>& expr, const Literal& lit) override { + // because the bounds are not necessarily a min or max value, this cannot be answered + // using them. notEq(col, X) with (X, Y) doesn't guarantee that X is a value in col. + return kRowsMightMatch; + } + + Result<bool> In(const std::shared_ptr<Bound>& expr, + const BoundSetPredicate::LiteralSet& literal_set) override { + ICEBERG_ASSIGN_OR_RAISE(auto ref, ParseBoundReference(expr)); + ICEBERG_ASSIGN_OR_RAISE(auto pos, GetPosition(*ref)); + const auto& summary = stats_.at(pos); + if (!summary.lower_bound.has_value() || !summary.upper_bound.has_value()) { + // values are all null and literalSet cannot contain null. + return kRowCannotMatch; + } + if (literal_set.size() > kInPredicateLimit) { + // skip evaluating the predicate if the number of values is too big + return kRowsMightMatch; + } + + ICEBERG_ASSIGN_OR_RAISE( + auto lower, DeserializeBoundLiteral(summary.lower_bound.value(), ref->type())); + + auto literals_view = literal_set | std::views::filter([&](const Literal& lit) { + return lower <= lit; + }); + + if (literals_view.empty()) { + // if all values are less than lower bound, rows cannot match. + return kRowCannotMatch; + } + + ICEBERG_ASSIGN_OR_RAISE( + auto upper, DeserializeBoundLiteral(summary.upper_bound.value(), ref->type())); + auto filtered_view = literals_view | std::views::filter([&](const Literal& lit) { Review Comment: How about merging two `std::views::filter`? ```cpp auto filtered_view = literals_set | std::views::filter([&lower, &upper](const Literal& lit) { return lower <= lit && lit <= upper; }); ``` -- This is an automated message from the Apache Git Service. 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