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56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
#include <Poco/SharedPtr.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/Columns/ColumnsNumber.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/Storages/StorageSystemNumbers.h>
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namespace DB
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{
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using Poco::SharedPtr;
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NumbersBlockInputStream::NumbersBlockInputStream(size_t block_size_) : block_size(block_size_), next(0)
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{
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}
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Block NumbersBlockInputStream::read()
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{
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Block res;
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ColumnWithNameAndType column_with_name_and_type;
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column_with_name_and_type.name = "number";
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column_with_name_and_type.type = new DataTypeUInt64();
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ColumnUInt64 * column = new ColumnUInt64(block_size);
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ColumnUInt64::Container_t & vec = column->getData();
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column_with_name_and_type.column = column;
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for (size_t i = 0; i < block_size; ++i)
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vec[i] = next++;
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res.insert(column_with_name_and_type);
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return res;
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}
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SharedPtr<IBlockInputStream> StorageSystemNumbers::read(
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const Names & column_names, const ptree & query, size_t max_block_size)
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{
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if (column_names.size() != 1)
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throw Exception("Incorrect number of columns.", ErrorCodes::INCORRECT_NUMBER_OF_COLUMNS);
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if (column_names[0] != "number")
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throw Exception("There is no column " + column_names[0] + " in table System.Numbers.",
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ErrorCodes::THERE_IS_NO_COLUMN);
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return new NumbersBlockInputStream(max_block_size);
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}
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}
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