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https://github.com/ClickHouse/ClickHouse.git
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341 lines
13 KiB
C++
341 lines
13 KiB
C++
#include <optional>
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#include <Storages/System/StorageSystemColumns.h>
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#include <Storages/MergeTree/MergeTreeData.h>
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#include <Columns/ColumnsNumber.h>
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#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataStreams/NullBlockInputStream.h>
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#include <Storages/VirtualColumnUtils.h>
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#include <Parsers/queryToString.h>
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#include <Parsers/ASTSelectQuery.h>
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#include <Access/ContextAccess.h>
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#include <Databases/IDatabase.h>
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#include <Processors/Sources/NullSource.h>
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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 TABLE_IS_DROPPED;
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}
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StorageSystemColumns::StorageSystemColumns(const std::string & name_)
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: IStorage({"system", name_})
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{
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setColumns(ColumnsDescription(
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{
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{ "database", std::make_shared<DataTypeString>() },
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{ "table", std::make_shared<DataTypeString>() },
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{ "name", std::make_shared<DataTypeString>() },
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{ "type", std::make_shared<DataTypeString>() },
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{ "default_kind", std::make_shared<DataTypeString>() },
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{ "default_expression", std::make_shared<DataTypeString>() },
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{ "data_compressed_bytes", std::make_shared<DataTypeUInt64>() },
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{ "data_uncompressed_bytes", std::make_shared<DataTypeUInt64>() },
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{ "marks_bytes", std::make_shared<DataTypeUInt64>() },
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{ "comment", std::make_shared<DataTypeString>() },
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{ "is_in_partition_key", std::make_shared<DataTypeUInt8>() },
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{ "is_in_sorting_key", std::make_shared<DataTypeUInt8>() },
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{ "is_in_primary_key", std::make_shared<DataTypeUInt8>() },
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{ "is_in_sampling_key", std::make_shared<DataTypeUInt8>() },
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{ "compression_codec", std::make_shared<DataTypeString>() },
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}));
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}
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namespace
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{
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using Storages = std::map<std::pair<std::string, std::string>, StoragePtr>;
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}
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class ColumnsSource : public SourceWithProgress
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{
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public:
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ColumnsSource(
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std::vector<UInt8> columns_mask_,
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Block header_,
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UInt64 max_block_size_,
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ColumnPtr databases_,
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ColumnPtr tables_,
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Storages storages_,
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const std::shared_ptr<const ContextAccess> & access_,
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String query_id_)
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: SourceWithProgress(header_)
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, columns_mask(std::move(columns_mask_)), max_block_size(max_block_size_)
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, databases(std::move(databases_)), tables(std::move(tables_)), storages(std::move(storages_))
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, query_id(std::move(query_id_)), total_tables(tables->size()), access(access_)
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{
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}
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String getName() const override { return "Columns"; }
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protected:
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Chunk generate() override
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{
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if (db_table_num >= total_tables)
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return {};
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MutableColumns res_columns = getPort().getHeader().cloneEmptyColumns();
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size_t rows_count = 0;
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const bool check_access_for_tables = !access->isGranted(AccessType::SHOW_COLUMNS);
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while (rows_count < max_block_size && db_table_num < total_tables)
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{
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const std::string database_name = (*databases)[db_table_num].get<std::string>();
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const std::string table_name = (*tables)[db_table_num].get<std::string>();
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++db_table_num;
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ColumnsDescription columns;
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Names cols_required_for_partition_key;
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Names cols_required_for_sorting_key;
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Names cols_required_for_primary_key;
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Names cols_required_for_sampling;
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MergeTreeData::ColumnSizeByName column_sizes;
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{
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StoragePtr storage = storages.at(std::make_pair(database_name, table_name));
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TableStructureReadLockHolder table_lock;
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try
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{
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table_lock = storage->lockStructureForShare(false, query_id);
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}
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catch (const Exception & e)
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{
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/** There are case when IStorage::drop was called,
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* but we still own the object.
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* Then table will throw exception at attempt to lock it.
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* Just skip the table.
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*/
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if (e.code() == ErrorCodes::TABLE_IS_DROPPED)
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continue;
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else
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throw;
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}
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columns = storage->getColumns();
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cols_required_for_partition_key = storage->getColumnsRequiredForPartitionKey();
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cols_required_for_sorting_key = storage->getColumnsRequiredForSortingKey();
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cols_required_for_primary_key = storage->getColumnsRequiredForPrimaryKey();
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cols_required_for_sampling = storage->getColumnsRequiredForSampling();
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column_sizes = storage->getColumnSizes();
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}
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bool check_access_for_columns = check_access_for_tables && !access->isGranted(AccessType::SHOW_COLUMNS, database_name, table_name);
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for (const auto & column : columns)
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{
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if (column.is_virtual)
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continue;
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if (check_access_for_columns && !access->isGranted(AccessType::SHOW_COLUMNS, database_name, table_name, column.name))
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continue;
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size_t src_index = 0;
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size_t res_index = 0;
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(database_name);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(table_name);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(column.name);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(column.type->getName());
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if (column.default_desc.expression)
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{
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(toString(column.default_desc.kind));
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(queryToString(column.default_desc.expression));
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}
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else
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{
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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}
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{
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const auto it = column_sizes.find(column.name);
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if (it == std::end(column_sizes))
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{
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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}
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else
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{
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(it->second.data_compressed);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(it->second.data_uncompressed);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(it->second.marks);
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}
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}
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(column.comment);
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{
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auto find_in_vector = [&key = column.name](const Names& names)
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{
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return std::find(names.cbegin(), names.cend(), key) != names.end();
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};
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(find_in_vector(cols_required_for_partition_key));
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(find_in_vector(cols_required_for_sorting_key));
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(find_in_vector(cols_required_for_primary_key));
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(find_in_vector(cols_required_for_sampling));
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}
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if (columns_mask[src_index++])
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{
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if (column.codec)
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res_columns[res_index++]->insert("CODEC(" + column.codec->getCodecDesc() + ")");
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else
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res_columns[res_index++]->insertDefault();
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}
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++rows_count;
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}
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}
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return Chunk(std::move(res_columns), rows_count);
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}
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private:
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std::vector<UInt8> columns_mask;
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UInt64 max_block_size;
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ColumnPtr databases;
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ColumnPtr tables;
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Storages storages;
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String query_id;
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size_t db_table_num = 0;
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size_t total_tables;
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std::shared_ptr<const ContextAccess> access;
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};
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Pipes StorageSystemColumns::read(
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const Names & column_names,
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const SelectQueryInfo & query_info,
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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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/// Create a mask of what columns are needed in the result.
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NameSet names_set(column_names.begin(), column_names.end());
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Block sample_block = getSampleBlock();
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Block header;
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std::vector<UInt8> columns_mask(sample_block.columns());
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for (size_t i = 0, size = columns_mask.size(); i < size; ++i)
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{
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if (names_set.count(sample_block.getByPosition(i).name))
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{
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columns_mask[i] = 1;
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header.insert(sample_block.getByPosition(i));
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}
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}
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Block block_to_filter;
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Storages storages;
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Pipes pipes;
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{
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Databases databases = DatabaseCatalog::instance().getDatabases();
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/// Add `database` column.
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MutableColumnPtr database_column_mut = ColumnString::create();
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for (const auto & database : databases)
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{
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/// We are skipping "Lazy" database because we cannot afford initialization of all its tables.
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/// This should be documented.
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if (database.second->getEngineName() != "Lazy")
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database_column_mut->insert(database.first);
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}
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block_to_filter.insert(ColumnWithTypeAndName(std::move(database_column_mut), std::make_shared<DataTypeString>(), "database"));
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/// Filter block with `database` column.
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VirtualColumnUtils::filterBlockWithQuery(query_info.query, block_to_filter, context);
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if (!block_to_filter.rows())
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{
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pipes.emplace_back(std::make_shared<NullSource>(header));
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return pipes;
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}
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ColumnPtr & database_column = block_to_filter.getByName("database").column;
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size_t rows = database_column->size();
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/// Add `table` column.
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MutableColumnPtr table_column_mut = ColumnString::create();
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IColumn::Offsets offsets(rows);
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for (size_t i = 0; i < rows; ++i)
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{
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const std::string database_name = (*database_column)[i].get<std::string>();
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const DatabasePtr database = databases.at(database_name);
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offsets[i] = i ? offsets[i - 1] : 0;
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for (auto iterator = database->getTablesWithDictionaryTablesIterator(context); iterator->isValid(); iterator->next())
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{
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const String & table_name = iterator->name();
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storages.emplace(std::piecewise_construct,
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std::forward_as_tuple(database_name, table_name),
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std::forward_as_tuple(iterator->table()));
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table_column_mut->insert(table_name);
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++offsets[i];
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}
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}
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database_column = database_column->replicate(offsets);
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block_to_filter.insert(ColumnWithTypeAndName(std::move(table_column_mut), std::make_shared<DataTypeString>(), "table"));
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}
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/// Filter block with `database` and `table` columns.
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VirtualColumnUtils::filterBlockWithQuery(query_info.query, block_to_filter, context);
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if (!block_to_filter.rows())
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{
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pipes.emplace_back(std::make_shared<NullSource>(header));
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return pipes;
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}
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ColumnPtr filtered_database_column = block_to_filter.getByName("database").column;
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ColumnPtr filtered_table_column = block_to_filter.getByName("table").column;
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pipes.emplace_back(std::make_shared<ColumnsSource>(
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std::move(columns_mask), std::move(header), max_block_size,
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std::move(filtered_database_column), std::move(filtered_table_column), std::move(storages),
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context.getAccess(), context.getCurrentQueryId()));
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return pipes;
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}
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}
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