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37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
#include <TableFunctions/ITableFunction.h>
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#include <Interpreters/Context.h>
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#include <Storages/StorageFactory.h>
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#include <Storages/StorageTableFunction.h>
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#include <Access/AccessFlags.h>
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#include <Common/ProfileEvents.h>
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namespace ProfileEvents
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{
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extern const Event TableFunctionExecute;
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}
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namespace DB
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{
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StoragePtr ITableFunction::execute(const ASTPtr & ast_function, const Context & context, const std::string & table_name,
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ColumnsDescription cached_columns) const
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{
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ProfileEvents::increment(ProfileEvents::TableFunctionExecute);
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context.checkAccess(AccessType::CREATE_TEMPORARY_TABLE | StorageFactory::instance().getSourceAccessType(getStorageTypeName()));
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if (cached_columns.empty() || (hasStaticStructure() && cached_columns == getActualTableStructure(context)))
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return executeImpl(ast_function, context, table_name, std::move(cached_columns));
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auto get_storage = [=, tf = shared_from_this()]() -> StoragePtr
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{
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return tf->executeImpl(ast_function, context, table_name, cached_columns);
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};
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/// It will request actual table structure and create underlying storage lazily
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return std::make_shared<StorageTableFunctionProxy>(StorageID(getDatabaseName(), table_name), std::move(get_storage),
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std::move(cached_columns), needStructureConversion());
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}
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}
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