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75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
#pragma once
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#include <DB/Storages/IStorage.h>
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#include <DB/Parsers/TablePropertiesQueriesASTs.h>
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#include <DB/Parsers/formatAST.h>
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#include <DB/Interpreters/Context.h>
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#include <DB/Interpreters/IInterpreter.h>
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#include <DB/DataStreams/OneBlockInputStream.h>
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#include <DB/DataStreams/BlockIO.h>
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#include <DB/DataStreams/copyData.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/DataTypes/DataTypeString.h>
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namespace DB
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{
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/** Вернуть одну строку с одним столбцом statement типа String с текстом запроса, создающего указанную таблицу.
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*/
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class InterpreterShowCreateQuery : public IInterpreter
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{
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public:
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InterpreterShowCreateQuery(ASTPtr query_ptr_, Context & context_)
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: query_ptr(query_ptr_), context(context_) {}
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BlockIO execute() override
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{
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BlockIO res;
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res.in = executeImpl();
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res.in_sample = getSampleBlock();
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return res;
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}
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private:
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ASTPtr query_ptr;
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Context context;
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Block getSampleBlock()
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{
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ColumnWithTypeAndName col;
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col.name = "statement";
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col.type = std::make_shared<DataTypeString>();
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col.column = col.type->createColumn();
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Block block;
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block.insert(col);
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return block;
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}
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BlockInputStreamPtr executeImpl()
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{
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const ASTShowCreateQuery & ast = typeid_cast<const ASTShowCreateQuery &>(*query_ptr);
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std::stringstream stream;
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formatAST(*context.getCreateQuery(ast.database, ast.table), stream, 0, false, true);
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String res = stream.str();
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ColumnWithTypeAndName col;
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col.name = "statement";
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col.type = std::make_shared<DataTypeString>();
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col.column = std::make_shared<ColumnConstString>(1, res);
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Block block;
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block.insert(col);
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return std::make_shared<OneBlockInputStream>(block);
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}
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};
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}
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