2017-04-01 09:19:00 +00:00
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#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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2012-06-18 07:49:19 +00:00
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namespace DB
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{
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2015-01-21 03:56:28 +00:00
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StorageSystemDatabases::StorageSystemDatabases(const std::string & name_)
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2017-04-01 07:20:54 +00:00
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: name(name_),
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columns
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{
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{"name", std::make_shared<DataTypeString>()},
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{"engine", std::make_shared<DataTypeString>()},
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}
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2012-06-18 07:49:19 +00:00
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{
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}
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BlockInputStreams StorageSystemDatabases::read(
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2017-04-01 07:20:54 +00:00
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const Names & column_names,
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2017-12-02 02:47:12 +00:00
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const SelectQueryInfo &,
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2017-04-01 07:20:54 +00:00
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const Context & context,
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QueryProcessingStage::Enum & processed_stage,
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2017-12-02 02:47:12 +00:00
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const size_t /*max_block_size*/,
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const unsigned /*num_streams*/)
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2012-06-18 07:49:19 +00:00
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{
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2017-04-01 07:20:54 +00:00
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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2012-06-18 07:49:19 +00:00
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2017-04-01 07:20:54 +00:00
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Block block;
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2014-10-03 15:30:10 +00:00
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2017-04-01 07:20:54 +00:00
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ColumnWithTypeAndName col_name{std::make_shared<ColumnString>(), std::make_shared<DataTypeString>(), "name"};
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block.insert(col_name);
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2012-06-18 07:49:19 +00:00
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2017-04-01 07:20:54 +00:00
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ColumnWithTypeAndName col_engine{std::make_shared<ColumnString>(), std::make_shared<DataTypeString>(), "engine"};
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block.insert(col_engine);
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2012-06-18 07:49:19 +00:00
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2017-04-01 07:20:54 +00:00
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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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col_name.column->insert(database.first);
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col_engine.column->insert(database.second->getEngineName());
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}
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2012-06-18 07:49:19 +00:00
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2017-04-01 07:20:54 +00:00
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return BlockInputStreams(1, std::make_shared<OneBlockInputStream>(block));
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2012-06-18 07:49:19 +00:00
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}
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}
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