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82 lines
3.3 KiB
C++
82 lines
3.3 KiB
C++
#include "Interpreters/Context_fwd.h"
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#include <Interpreters/getHeaderForProcessingStage.h>
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#include <Interpreters/InterpreterSelectQuery.h>
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#include <Interpreters/AddDefaultDatabaseVisitor.h>
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#include <Processors/Transforms/AddingDefaultsTransform.h>
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#include <Processors/Sources/RemoteSource.h>
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#include <Parsers/queryToString.h>
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#include <QueryPipeline/RemoteQueryExecutor.h>
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#include <Storages/StorageFileCluster.h>
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#include <Storages/IStorage.h>
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#include <Storages/StorageFile.h>
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#include <Storages/extractTableFunctionArgumentsFromSelectQuery.h>
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#include <Storages/VirtualColumnUtils.h>
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#include <TableFunctions/TableFunctionFileCluster.h>
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#include <memory>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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StorageFileCluster::StorageFileCluster(
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ContextPtr context_,
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const String & cluster_name_,
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const String & filename_,
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const String & format_name_,
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const String & compression_method_,
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const StorageID & table_id_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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bool structure_argument_was_provided_)
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: IStorageCluster(cluster_name_, table_id_, &Poco::Logger::get("StorageFileCluster (" + table_id_.table_name + ")"), structure_argument_was_provided_)
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, filename(filename_)
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, format_name(format_name_)
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, compression_method(compression_method_)
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{
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StorageInMemoryMetadata storage_metadata;
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size_t total_bytes_to_read; // its value isn't used as we are not reading files (just listing them). But it is required by getPathsList
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paths = StorageFile::getPathsList(filename_, context_->getUserFilesPath(), context_, total_bytes_to_read);
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if (columns_.empty())
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{
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auto columns = StorageFile::getTableStructureFromFile(format_name,
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paths,
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compression_method,
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std::nullopt,
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context_);
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storage_metadata.setColumns(columns);
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}
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else
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storage_metadata.setColumns(columns_);
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storage_metadata.setConstraints(constraints_);
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setInMemoryMetadata(storage_metadata);
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virtual_columns = VirtualColumnUtils::getPathFileAndSizeVirtualsForStorage(storage_metadata.getSampleBlock().getNamesAndTypesList());
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}
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void StorageFileCluster::addColumnsStructureToQuery(ASTPtr & query, const String & structure, const ContextPtr & context)
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{
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ASTExpressionList * expression_list = extractTableFunctionArgumentsFromSelectQuery(query);
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if (!expression_list)
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Expected SELECT query from table function fileCluster, got '{}'", queryToString(query));
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TableFunctionFileCluster::addColumnsStructureToArguments(expression_list->children, structure, context);
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}
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RemoteQueryExecutor::Extension StorageFileCluster::getTaskIteratorExtension(ASTPtr query, const ContextPtr & context) const
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{
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auto iterator = std::make_shared<StorageFileSource::FilesIterator>(paths, std::nullopt, query, virtual_columns, context);
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auto callback = std::make_shared<TaskIterator>([iter = std::move(iterator)]() mutable -> String { return iter->next(); });
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return RemoteQueryExecutor::Extension{.task_iterator = std::move(callback)};
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}
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}
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