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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,55 +1,47 @@ | ||
| #ifndef __JOIN_H__ | ||
| #define __JOIN_H__ | ||
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| #include <optional> | ||
| #include "absl/status/status.h" | ||
| #include "absl/status/statusor.h" | ||
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| #include "komfydb/execution/join_predicate.h" | ||
| #include "komfydb/execution/op_iterator.h" | ||
| #include "komfydb/storage/page_id.h" | ||
| #include "komfydb/storage/record_id.h" | ||
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| namespace { | ||
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| using komfydb::common::TupleDesc; | ||
| using komfydb::execution::JoinPredicate; | ||
| using komfydb::storage::RecordId; | ||
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| }; | ||
| } // namespace | ||
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| namespace komfydb::execution { | ||
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| class Join : public OpIterator { | ||
| public: | ||
| static absl::StatusOr<std::unique_ptr<Join>> Create( | ||
| std::unique_ptr<OpIterator> l_child, JoinPredicate join_predicate, | ||
| std::unique_ptr<OpIterator> r_child); | ||
| Join(TupleDesc& tuple_desc, std::vector<std::string> fields_table_ids, | ||
| JoinPredicate join_predicate, std::unique_ptr<OpIterator> l_child, | ||
| std::unique_ptr<OpIterator> r_child); | ||
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| JoinPredicate GetJoinPredicate(); | ||
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| absl::StatusOr<std::string> GetJoinField1Name(); | ||
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| absl::StatusOr<std::string> GetJoinField2Name(); | ||
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| absl::Status Open() override; | ||
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| void Close() override; | ||
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| absl::Status Rewind() override; | ||
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| void Explain(std::ostream& os, int indent = 0) override; | ||
| // virtual ~Join() = default; | ||
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| protected: | ||
| Join(std::unique_ptr<OpIterator> l_child, JoinPredicate join_predicate, | ||
| std::unique_ptr<OpIterator> r_child, TupleDesc tuple_desc); | ||
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| absl::Status FetchNext() override; | ||
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| JoinPredicate join_predicate; | ||
| std::unique_ptr<OpIterator> l_child; | ||
| std::unique_ptr<OpIterator> r_child; | ||
| std::unique_ptr<Record> l_child_next; | ||
| const RecordId joined_record_id; | ||
| }; | ||
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| }; // namespace komfydb::execution | ||
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| #endif // __JOIN_H__ | ||
| #endif // __JOIN_H__ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| #include "absl/status/status.h" | ||
| #include "absl/status/statusor.h" | ||
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| #include "komfydb/utils/status_macros.h" | ||
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| #include "komfydb/common/tuple_desc.h" | ||
| #include "komfydb/execution/join_predicate.h" | ||
| #include "komfydb/execution/loops_join.h" | ||
| #include "komfydb/storage/record.h" | ||
| #include "komfydb/utils/utility.h" | ||
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| namespace { | ||
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| using komfydb::common::JoinVectors; | ||
| using komfydb::common::TupleDesc; | ||
| using komfydb::storage::PageId; | ||
| using komfydb::storage::RecordId; | ||
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| } // namespace | ||
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| namespace komfydb::execution { | ||
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| LoopsJoin::LoopsJoin(std::unique_ptr<OpIterator> l_child, | ||
| JoinPredicate join_predicate, | ||
| std::unique_ptr<OpIterator> r_child, TupleDesc tuple_desc) | ||
| : Join(tuple_desc, | ||
| JoinVectors(*l_child->GetFieldsTableAliases(), | ||
| *r_child->GetFieldsTableAliases()), | ||
| join_predicate, std::move(l_child), std::move(r_child)), | ||
| l_child_next(nullptr) {} | ||
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| absl::StatusOr<std::unique_ptr<LoopsJoin>> LoopsJoin::Create( | ||
| std::unique_ptr<OpIterator> l_child, JoinPredicate join_predicate, | ||
| std::unique_ptr<OpIterator> r_child) { | ||
| TupleDesc tuple_desc(*l_child->GetTupleDesc(), *r_child->GetTupleDesc()); | ||
| return std::unique_ptr<LoopsJoin>(new LoopsJoin( | ||
| std::move(l_child), join_predicate, std::move(r_child), tuple_desc)); | ||
| } | ||
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| absl::Status LoopsJoin::Open() { | ||
| RETURN_IF_ERROR(l_child->Open()); | ||
| RETURN_IF_ERROR(r_child->Open()); | ||
| return absl::OkStatus(); | ||
| } | ||
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| absl::Status LoopsJoin::Rewind() { | ||
| RETURN_IF_ERROR(l_child->Rewind()); | ||
| RETURN_IF_ERROR(r_child->Rewind()); | ||
| l_child_next = {}; | ||
| next_record = {}; | ||
| return absl::OkStatus(); | ||
| } | ||
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| absl::Status LoopsJoin::FetchNext() { | ||
| if (next_record) | ||
| return absl::OkStatus(); | ||
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| absl::Status status; | ||
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| while (!next_record) { | ||
| if (!l_child_next) { | ||
| if ((status = l_child->HasNext()).ok()) { | ||
| l_child_next = *(l_child->Next()); | ||
| } else { | ||
| return status; | ||
| } | ||
| } | ||
| while ((status = r_child->HasNext()).ok()) { | ||
| std::unique_ptr<Record> potential_match = *(r_child->Next()); | ||
| if (join_predicate.Filter(*l_child_next, *potential_match)) { | ||
| next_record = std::make_unique<Record>( | ||
| Record(Tuple(*l_child_next, std::move(*potential_match)), | ||
| joined_record_id)); | ||
| return absl::OkStatus(); | ||
| } | ||
| } | ||
| RETURN_IF_NOT_OOR(status); | ||
| l_child_next = {}; | ||
| RETURN_IF_ERROR(r_child->Rewind()); | ||
| continue; | ||
| } | ||
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| return absl::OkStatus(); | ||
| } | ||
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| void LoopsJoin::Explain(std::ostream& os, int indent) { | ||
| os << Indent(indent) << "-> Nested loops join: " << join_predicate << "\n"; | ||
| os << Indent(indent + td_indent) << "TD: " << tuple_desc << "\n"; | ||
| l_child->Explain(os, indent + child_indent); | ||
| r_child->Explain(os, indent + child_indent); | ||
| } | ||
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| } // namespace komfydb::execution |
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