ClickHouse/src/Storages/StorageMaterializedView.h

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#pragma once
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#include <ext/shared_ptr_helper.h>
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#include <Parsers/IAST_fwd.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Storages/IStorage.h>
#include <Storages/StorageInMemoryMetadata.h>
namespace DB
{
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class StorageMaterializedView final : public ext::shared_ptr_helper<StorageMaterializedView>, public IStorage, WithMutableContext
{
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friend struct ext::shared_ptr_helper<StorageMaterializedView>;
public:
std::string getName() const override { return "MaterializedView"; }
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bool isView() const override { return true; }
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bool hasInnerTable() const { return has_inner_table; }
bool supportsSampling() const override { return getTargetTable()->supportsSampling(); }
bool supportsPrewhere() const override { return getTargetTable()->supportsPrewhere(); }
bool supportsFinal() const override { return getTargetTable()->supportsFinal(); }
bool supportsIndexForIn() const override { return getTargetTable()->supportsIndexForIn(); }
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bool supportsParallelInsert() const override { return getTargetTable()->supportsParallelInsert(); }
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bool supportsSubcolumns() const override { return getTargetTable()->supportsSubcolumns(); }
bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & /* metadata_snapshot */) const override
{
auto target_table = getTargetTable();
auto metadata_snapshot = target_table->getInMemoryMetadataPtr();
return target_table->mayBenefitFromIndexForIn(left_in_operand, query_context, metadata_snapshot);
}
BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
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void drop() override;
void dropInnerTable(bool no_delay, ContextPtr context);
void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &) override;
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bool optimize(
const ASTPtr & query,
const StorageMetadataPtr & metadata_snapshot,
const ASTPtr & partition,
bool final,
bool deduplicate,
const Names & deduplicate_by_columns,
ContextPtr context) override;
void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & table_lock_holder) override;
void checkMutationIsPossible(const MutationCommands & commands, const Settings & settings) const override;
void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override;
Pipe alterPartition(const StorageMetadataPtr & metadata_snapshot, const PartitionCommands & commands, ContextPtr context) override;
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void checkAlterPartitionIsPossible(const PartitionCommands & commands, const StorageMetadataPtr & metadata_snapshot, const Settings & settings) const override;
void mutate(const MutationCommands & commands, ContextPtr context) override;
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void renameInMemory(const StorageID & new_table_id) override;
void shutdown() override;
QueryProcessingStage::Enum
getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum, const StorageMetadataPtr &, SelectQueryInfo &) const override;
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StoragePtr getTargetTable() const;
StoragePtr tryGetTargetTable() const;
ActionLock getActionLock(StorageActionBlockType type) override;
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Pipe read(
const Names & column_names,
const StorageMetadataPtr & /*metadata_snapshot*/,
SelectQueryInfo & query_info,
ContextPtr context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
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unsigned num_streams) override;
void read(
QueryPlan & query_plan,
const Names & column_names,
const StorageMetadataPtr & metadata_snapshot,
SelectQueryInfo & query_info,
ContextPtr context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
unsigned num_streams) override;
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Strings getDataPaths() const override;
private:
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/// Will be initialized in constructor
StorageID target_table_id = StorageID::createEmpty();
bool has_inner_table = false;
void checkStatementCanBeForwarded() const;
protected:
StorageMaterializedView(
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const StorageID & table_id_,
ContextPtr local_context,
const ASTCreateQuery & query,
const ColumnsDescription & columns_,
bool attach_);
};
}