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31 lines
946 B
C++
31 lines
946 B
C++
#pragma once
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#include <TableFunctions/ITableFunction.h>
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namespace DB
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{
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/* merge (db_name, tables_regexp) - creates a temporary StorageMerge.
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* The structure of the table is taken from the first table that came up, suitable for regexp.
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* If there is no such table, an exception is thrown.
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*/
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class TableFunctionMerge : public ITableFunction
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{
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public:
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static constexpr auto name = "merge";
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std::string getName() const override { return name; }
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private:
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StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
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const char * getStorageTypeName() const override { return "Merge"; }
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ColumnsDescription getActualTableStructure(const Context & context) const override;
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void parseArguments(const ASTPtr & ast_function, const Context & context) override;
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String source_database;
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String table_name_regexp;
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};
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}
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