2017-04-01 09:19:00 +00:00
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#include <Storages/IStorage.h>
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2021-09-15 19:35:48 +00:00
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#include <Processors/Sources/SourceFromSingleChunk.h>
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2021-10-15 20:18:20 +00:00
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#include <QueryPipeline/BlockIO.h>
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2017-04-01 09:19:00 +00:00
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#include <DataTypes/DataTypeString.h>
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#include <Parsers/queryToString.h>
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2017-07-13 20:58:19 +00:00
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#include <Common/typeid_cast.h>
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2017-11-01 14:34:05 +00:00
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#include <TableFunctions/ITableFunction.h>
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#include <TableFunctions/TableFunctionFactory.h>
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2018-02-28 04:55:43 +00:00
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#include <Interpreters/InterpreterSelectWithUnionQuery.h>
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#include <Interpreters/InterpreterSelectQueryAnalyzer.h>
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2018-02-28 04:55:43 +00:00
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#include <Interpreters/Context.h>
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#include <Interpreters/InterpreterDescribeQuery.h>
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2019-01-25 15:42:24 +00:00
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#include <Interpreters/IdentifierSemantic.h>
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#include <Access/Common/AccessFlags.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Parsers/ASTFunction.h>
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2017-11-01 14:34:05 +00:00
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#include <Parsers/ASTTablesInSelectQuery.h>
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#include <Parsers/TablePropertiesQueriesASTs.h>
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#include <DataTypes/NestedUtils.h>
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2016-12-12 07:24:56 +00:00
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namespace DB
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{
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Block InterpreterDescribeQuery::getSampleBlock(bool include_subcolumns)
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{
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Block block;
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ColumnWithTypeAndName col;
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col.name = "name";
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col.type = std::make_shared<DataTypeString>();
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col.column = col.type->createColumn();
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block.insert(col);
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col.name = "type";
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block.insert(col);
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col.name = "default_type";
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block.insert(col);
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col.name = "default_expression";
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block.insert(col);
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2019-02-19 17:02:51 +00:00
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col.name = "comment";
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block.insert(col);
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2018-12-25 10:04:38 +00:00
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col.name = "codec_expression";
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block.insert(col);
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2019-04-15 09:30:45 +00:00
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col.name = "ttl_expression";
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block.insert(col);
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if (include_subcolumns)
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{
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col.name = "is_subcolumn";
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col.type = std::make_shared<DataTypeUInt8>();
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col.column = col.type->createColumn();
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block.insert(col);
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}
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2016-12-12 07:24:56 +00:00
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return block;
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}
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BlockIO InterpreterDescribeQuery::execute()
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{
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std::vector<ColumnDescription> columns;
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StorageSnapshotPtr storage_snapshot;
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2019-03-16 21:46:53 +00:00
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const auto & ast = query_ptr->as<ASTDescribeQuery &>();
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const auto & table_expression = ast.table_expression->as<ASTTableExpression &>();
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const auto & settings = getContext()->getSettingsRef();
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if (table_expression.subquery)
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{
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NamesAndTypesList names_and_types;
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auto select_query = table_expression.subquery->children.at(0);
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auto current_context = getContext();
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if (settings.allow_experimental_analyzer)
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{
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SelectQueryOptions select_query_options;
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names_and_types = InterpreterSelectQueryAnalyzer(select_query, current_context, select_query_options).getSampleBlock().getNamesAndTypesList();
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}
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else
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{
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names_and_types = InterpreterSelectWithUnionQuery::getSampleBlock(select_query, current_context).getNamesAndTypesList();
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}
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for (auto && [name, type] : names_and_types)
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{
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ColumnDescription description;
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description.name = std::move(name);
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description.type = std::move(type);
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columns.emplace_back(std::move(description));
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}
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2018-02-28 04:55:43 +00:00
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}
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else if (table_expression.table_function)
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{
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TableFunctionPtr table_function_ptr = TableFunctionFactory::instance().get(table_expression.table_function, getContext());
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auto table_function_column_descriptions = table_function_ptr->getActualTableStructure(getContext(), /*is_insert_query*/ true);
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for (const auto & table_function_column_description : table_function_column_descriptions)
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columns.emplace_back(table_function_column_description);
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}
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else
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{
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auto table_id = getContext()->resolveStorageID(table_expression.database_and_table_name);
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getContext()->checkAccess(AccessType::SHOW_COLUMNS, table_id);
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auto table = DatabaseCatalog::instance().getTable(table_id, getContext());
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auto table_lock = table->lockForShare(getContext()->getInitialQueryId(), settings.lock_acquire_timeout);
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2020-06-17 16:39:58 +00:00
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auto metadata_snapshot = table->getInMemoryMetadataPtr();
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storage_snapshot = table->getStorageSnapshot(metadata_snapshot, getContext());
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auto metadata_column_descriptions = metadata_snapshot->getColumns();
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for (const auto & metadata_column_description : metadata_column_descriptions)
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columns.emplace_back(metadata_column_description);
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}
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bool extend_object_types = settings.describe_extend_object_types && storage_snapshot;
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bool include_subcolumns = settings.describe_include_subcolumns;
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Block sample_block = getSampleBlock(include_subcolumns);
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MutableColumns res_columns = sample_block.cloneEmptyColumns();
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for (const auto & column : columns)
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{
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res_columns[0]->insert(column.name);
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DataTypePtr type;
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if (extend_object_types)
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type = storage_snapshot->getConcreteType(column.name);
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else
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type = column.type;
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if (getContext()->getSettingsRef().print_pretty_type_names)
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res_columns[1]->insert(type->getPrettyName());
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else
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res_columns[1]->insert(type->getName());
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if (column.default_desc.expression)
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{
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res_columns[2]->insert(toString(column.default_desc.kind));
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res_columns[3]->insert(queryToString(column.default_desc.expression));
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}
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else
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{
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res_columns[2]->insertDefault();
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res_columns[3]->insertDefault();
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2018-11-06 13:26:43 +00:00
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}
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2019-03-14 15:20:51 +00:00
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res_columns[4]->insert(column.comment);
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if (column.codec)
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res_columns[5]->insert(queryToString(column.codec->as<ASTFunction>()->arguments));
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else
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res_columns[5]->insertDefault();
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if (column.ttl)
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res_columns[6]->insert(queryToString(column.ttl));
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else
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res_columns[6]->insertDefault();
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if (include_subcolumns)
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res_columns[7]->insertDefault();
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}
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if (include_subcolumns)
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{
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for (const auto & column : columns)
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{
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auto type = extend_object_types ? storage_snapshot->getConcreteType(column.name) : column.type;
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2021-10-11 22:01:00 +00:00
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IDataType::forEachSubcolumn([&](const auto & path, const auto & name, const auto & data)
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{
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res_columns[0]->insert(Nested::concatenateName(column.name, name));
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res_columns[1]->insert(data.type->getName());
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/// It's not trivial to calculate default expression for subcolumn.
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/// So, leave it empty.
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res_columns[2]->insertDefault();
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res_columns[3]->insertDefault();
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res_columns[4]->insert(column.comment);
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if (column.codec && ISerialization::isSpecialCompressionAllowed(path))
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res_columns[5]->insert(queryToString(column.codec->as<ASTFunction>()->arguments));
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else
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res_columns[5]->insertDefault();
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if (column.ttl)
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res_columns[6]->insert(queryToString(column.ttl));
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else
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res_columns[6]->insertDefault();
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res_columns[7]->insert(1u);
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2022-06-17 01:10:52 +00:00
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}, ISerialization::SubstreamData(type->getDefaultSerialization()).withType(type));
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}
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2016-12-12 07:24:56 +00:00
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}
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2017-04-01 07:20:54 +00:00
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2021-09-11 20:24:01 +00:00
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BlockIO res;
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size_t num_rows = res_columns[0]->size();
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auto source = std::make_shared<SourceFromSingleChunk>(sample_block, Chunk(std::move(res_columns), num_rows));
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res.pipeline = QueryPipeline(std::move(source));
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return res;
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2016-12-12 07:24:56 +00:00
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}
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}
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