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https://github.com/ClickHouse/ClickHouse.git
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4e76629aaf
- lots of static_cast - add safe_cast - types adjustments - config - IStorage::read/watch - ... - some TODO's (to convert types in future) P.S. That was quite a journey... v2: fixes after rebase v3: fix conflicts after #42308 merged Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
112 lines
4.2 KiB
C++
112 lines
4.2 KiB
C++
#pragma once
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#include <Common/RWLock.h>
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#include <Storages/StorageSet.h>
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#include <Storages/TableLockHolder.h>
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#include <Parsers/ASTTablesInSelectQuery.h>
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#include <Interpreters/JoinUtils.h>
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namespace DB
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{
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class TableJoin;
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class HashJoin;
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using HashJoinPtr = std::shared_ptr<HashJoin>;
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/** Allows you save the state for later use on the right side of the JOIN.
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* When inserted into a table, the data will be inserted into the state,
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* and also written to the backup file, to restore after the restart.
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* Reading from the table is not possible directly - only specifying on the right side of JOIN is possible.
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*
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* When using, JOIN must be of the appropriate type (ANY|ALL LEFT|INNER ...).
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*/
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class StorageJoin final : public StorageSetOrJoinBase
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{
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public:
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StorageJoin(
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DiskPtr disk_,
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const String & relative_path_,
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const StorageID & table_id_,
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const Names & key_names_,
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bool use_nulls_,
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SizeLimits limits_,
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JoinKind kind_,
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JoinStrictness strictness_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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const String & comment,
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bool overwrite,
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bool persistent_);
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String getName() const override { return "Join"; }
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void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &) override;
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/// Only delete is supported.
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void checkMutationIsPossible(const MutationCommands & commands, const Settings & settings) const override;
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void mutate(const MutationCommands & commands, ContextPtr context) override;
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/// Return instance of HashJoin holding lock that protects from insertions to StorageJoin.
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/// HashJoin relies on structure of hash table that's why we need to return it with locked mutex.
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HashJoinPtr getJoinLocked(std::shared_ptr<TableJoin> analyzed_join, ContextPtr context) const;
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/// Get result type for function "joinGet(OrNull)"
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DataTypePtr joinGetCheckAndGetReturnType(const DataTypes & data_types, const String & column_name, bool or_null) const;
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/// Execute function "joinGet(OrNull)" on data block.
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/// Takes rwlock for read to prevent parallel StorageJoin updates during processing data block
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/// (but not during processing whole query, it's safe for joinGet that doesn't involve `used_flags` from HashJoin)
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ColumnWithTypeAndName joinGet(const Block & block, const Block & block_with_columns_to_add, ContextPtr context) const;
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SinkToStoragePtr write(const ASTPtr & query, const StorageMetadataPtr & metadata_snapshot, ContextPtr context) override;
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Pipe read(
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const Names & column_names,
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const StorageSnapshotPtr & storage_snapshot,
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SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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size_t num_streams) override;
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std::optional<UInt64> totalRows(const Settings & settings) const override;
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std::optional<UInt64> totalBytes(const Settings & settings) const override;
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Block getRightSampleBlock() const
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{
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auto metadata_snapshot = getInMemoryMetadataPtr();
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Block block = metadata_snapshot->getSampleBlock();
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if (use_nulls && isLeftOrFull(kind))
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for (auto & col : block)
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JoinCommon::convertColumnToNullable(col);
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return block;
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}
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bool useNulls() const { return use_nulls; }
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private:
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Block sample_block;
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const Names key_names;
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bool use_nulls;
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SizeLimits limits;
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JoinKind kind; /// LEFT | INNER ...
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JoinStrictness strictness; /// ANY | ALL
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bool overwrite;
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std::shared_ptr<TableJoin> table_join;
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HashJoinPtr join;
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/// Protect state for concurrent use in insertFromBlock and joinBlock.
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/// Lock is stored in HashJoin instance during query and blocks concurrent insertions.
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mutable RWLock rwlock = RWLockImpl::create();
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mutable std::mutex mutate_mutex;
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void insertBlock(const Block & block, ContextPtr context) override;
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void finishInsert() override {}
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size_t getSize(ContextPtr context) const override;
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RWLockImpl::LockHolder tryLockTimedWithContext(const RWLock & lock, RWLockImpl::Type type, ContextPtr context) const;
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};
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}
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