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85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
#include <Storages/IStorage.h>
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#include <Parsers/TablePropertiesQueriesASTs.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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#include <QueryPipeline/BlockIO.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Columns/ColumnsNumber.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/InterpreterExistsQuery.h>
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#include <Access/Common/AccessFlags.h>
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#include <Common/typeid_cast.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 SYNTAX_ERROR;
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}
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BlockIO InterpreterExistsQuery::execute()
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{
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BlockIO res;
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res.pipeline = executeImpl();
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return res;
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}
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Block InterpreterExistsQuery::getSampleBlock()
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{
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return Block{{
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ColumnUInt8::create(),
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std::make_shared<DataTypeUInt8>(),
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"result" }};
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}
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QueryPipeline InterpreterExistsQuery::executeImpl()
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{
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ASTQueryWithTableAndOutput * exists_query;
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bool result = false;
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if ((exists_query = query_ptr->as<ASTExistsTableQuery>()))
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{
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if (exists_query->temporary)
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{
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result = static_cast<bool>(getContext()->tryResolveStorageID(
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{"", exists_query->getTable()}, Context::ResolveExternal));
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}
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else
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{
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String database = getContext()->resolveDatabase(exists_query->getDatabase());
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getContext()->checkAccess(AccessType::SHOW_TABLES, database, exists_query->getTable());
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result = DatabaseCatalog::instance().isTableExist({database, exists_query->getTable()}, getContext());
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}
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}
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else if ((exists_query = query_ptr->as<ASTExistsViewQuery>()))
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{
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String database = getContext()->resolveDatabase(exists_query->getDatabase());
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getContext()->checkAccess(AccessType::SHOW_TABLES, database, exists_query->getTable());
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auto table = DatabaseCatalog::instance().tryGetTable({database, exists_query->getTable()}, getContext());
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result = table && table->isView();
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}
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else if ((exists_query = query_ptr->as<ASTExistsDatabaseQuery>()))
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{
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String database = getContext()->resolveDatabase(exists_query->getDatabase());
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getContext()->checkAccess(AccessType::SHOW_DATABASES, database);
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result = DatabaseCatalog::instance().isDatabaseExist(database);
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}
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else if ((exists_query = query_ptr->as<ASTExistsDictionaryQuery>()))
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{
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if (exists_query->temporary)
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throw Exception("Temporary dictionaries are not possible.", ErrorCodes::SYNTAX_ERROR);
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String database = getContext()->resolveDatabase(exists_query->getDatabase());
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getContext()->checkAccess(AccessType::SHOW_DICTIONARIES, database, exists_query->getTable());
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result = DatabaseCatalog::instance().isDictionaryExist({database, exists_query->getTable()});
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}
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return QueryPipeline(std::make_shared<SourceFromSingleChunk>(Block{{
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ColumnUInt8::create(1, result),
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std::make_shared<DataTypeUInt8>(),
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"result" }}));
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}
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}
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