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https://github.com/ClickHouse/ClickHouse.git
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66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
#include <DB/Columns/ColumnString.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/DataStreams/OneBlockInputStream.h>
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#include <DB/Storages/StorageSystemSettings.h>
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namespace DB
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{
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StorageSystemSettings::StorageSystemSettings(const std::string & name_, const Context & context_)
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: name(name_), context(context_)
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, columns{
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{ "name", new DataTypeString },
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{ "value", new DataTypeString },
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{ "changed", new DataTypeUInt8 },
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}
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{
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}
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StoragePtr StorageSystemSettings::create(const std::string & name_, const Context & context_)
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{
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return (new StorageSystemSettings(name_, context_))->thisPtr();
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}
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BlockInputStreams StorageSystemSettings::read(
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const Names & column_names, ASTPtr query, const Settings & settings,
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QueryProcessingStage::Enum & processed_stage, size_t max_block_size, unsigned threads)
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{
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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ColumnWithNameAndType col_name{new ColumnString, new DataTypeString, "name"};
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ColumnWithNameAndType col_value{new ColumnString, new DataTypeString, "value"};
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ColumnWithNameAndType col_changed{new ColumnUInt8, new DataTypeUInt8, "changed"};
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#define ADD_SETTING(TYPE, NAME, DEFAULT) \
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col_name.column->insert(String(#NAME)); \
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col_value.column->insert(settings.NAME.toString()); \
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col_changed.column->insert(UInt64(settings.NAME.changed));
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APPLY_FOR_SETTINGS(ADD_SETTING)
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#undef ADD_SETTING
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#define ADD_LIMIT(TYPE, NAME, DEFAULT) \
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col_name.column->insert(String(#NAME)); \
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col_value.column->insert(settings.limits.NAME.toString()); \
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col_changed.column->insert(UInt64(settings.limits.NAME.changed));
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APPLY_FOR_LIMITS(ADD_LIMIT)
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#undef ADD_LIMIT
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Block block{
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col_name,
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col_value,
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col_changed,
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};
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return BlockInputStreams(1, new OneBlockInputStream(block));
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}
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}
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