ClickHouse/src/TableFunctions/TableFunctionView.h

#pragma once

#include <TableFunctions/ITableFunction.h>
#include <Parsers/ASTCreateQuery.h>
#include <base/types.h>

namespace DB
{

/* view(query)
 * Turning subquery into a table.
 * Useful for passing subquery around.
 */
class TableFunctionView : public ITableFunction
{
public:
    static constexpr auto name = "view";

    std::string getName() const override { return name; }

    const ASTSelectWithUnionQuery & getSelectQuery() const;

private:
    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const String & table_name, ColumnsDescription cached_columns, bool is_insert_query) const override;

    const char * getStorageTypeName() const override { return "View"; }

    std::vector<size_t> skipAnalysisForArguments(const QueryTreeNodePtr & query_node_table_function, ContextPtr context) const override;

    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;

    ColumnsDescription getActualTableStructure(ContextPtr context, bool is_insert_query) const override;

    ASTCreateQuery create;
};


}