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52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <Databases/IDatabase.h>
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#include <Storages/System/StorageSystemDatabases.h>
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#include <Interpreters/Context.h>
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namespace DB
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{
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StorageSystemDatabases::StorageSystemDatabases(const std::string & name_)
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: name(name_)
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{
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setColumns(ColumnsDescription({
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{"name", std::make_shared<DataTypeString>()},
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{"engine", std::make_shared<DataTypeString>()},
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{"data_path", std::make_shared<DataTypeString>()},
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{"metadata_path", std::make_shared<DataTypeString>()},
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}));
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}
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BlockInputStreams StorageSystemDatabases::read(
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const Names & column_names,
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const SelectQueryInfo &,
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const Context & context,
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QueryProcessingStage::Enum & processed_stage,
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const size_t /*max_block_size*/,
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const unsigned /*num_streams*/)
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{
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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MutableColumns res_columns = getSampleBlock().cloneEmptyColumns();
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auto databases = context.getDatabases();
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for (const auto & database : databases)
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{
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res_columns[0]->insert(database.first);
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res_columns[1]->insert(database.second->getEngineName());
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res_columns[2]->insert(database.second->getDataPath());
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res_columns[3]->insert(database.second->getMetadataPath());
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}
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return BlockInputStreams(1, std::make_shared<OneBlockInputStream>(getSampleBlock().cloneWithColumns(std::move(res_columns))));
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}
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}
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