ClickHouse/programs/odbc-bridge/ODBCBlockInputStream.cpp

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#include "ODBCBlockInputStream.h"
#include <vector>
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#include <IO/ReadBufferFromString.h>
#include <DataTypes/DataTypeNullable.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnsNumber.h>
#include <Common/assert_cast.h>
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#include <IO/ReadHelpers.h>
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#include <IO/WriteHelpers.h>
#include <common/logger_useful.h>
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namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_TYPE;
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}
ODBCBlockInputStream::ODBCBlockInputStream(
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nanodbc::ConnectionHolderPtr connection_holder, const std::string & query_str, const Block & sample_block, const UInt64 max_block_size_)
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: log(&Poco::Logger::get("ODBCBlockInputStream"))
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, max_block_size{max_block_size_}
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, query(query_str)
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{
description.init(sample_block);
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result = execute<nanodbc::result>(connection_holder,
[&](nanodbc::connection & connection) { return execute(connection, query); });
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}
Block ODBCBlockInputStream::readImpl()
{
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if (finished)
return Block();
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MutableColumns columns(description.sample_block.cloneEmptyColumns());
size_t num_rows = 0;
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while (true)
{
if (!result.next())
{
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finished = true;
break;
}
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for (int idx = 0; idx < result.columns(); ++idx)
{
const auto & sample = description.sample_block.getByPosition(idx);
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if (!result.is_null(idx))
{
bool is_nullable = description.types[idx].second;
if (is_nullable)
{
ColumnNullable & column_nullable = assert_cast<ColumnNullable &>(*columns[idx]);
const auto & data_type = assert_cast<const DataTypeNullable &>(*sample.type);
insertValue(column_nullable.getNestedColumn(), data_type.getNestedType(), description.types[idx].first, result, idx);
column_nullable.getNullMapData().emplace_back(0);
}
else
{
insertValue(*columns[idx], sample.type, description.types[idx].first, result, idx);
}
}
else
insertDefaultValue(*columns[idx], *sample.column);
}
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if (++num_rows == max_block_size)
break;
}
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return description.sample_block.cloneWithColumns(std::move(columns));
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}
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void ODBCBlockInputStream::insertValue(
IColumn & column, const DataTypePtr data_type, const ValueType type, nanodbc::result & row, size_t idx)
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{
switch (type)
{
case ValueType::vtUInt8:
assert_cast<ColumnUInt8 &>(column).insertValue(row.get<uint16_t>(idx));
break;
case ValueType::vtUInt16:
assert_cast<ColumnUInt16 &>(column).insertValue(row.get<uint16_t>(idx));
break;
case ValueType::vtUInt32:
assert_cast<ColumnUInt32 &>(column).insertValue(row.get<uint32_t>(idx));
break;
case ValueType::vtUInt64:
assert_cast<ColumnUInt64 &>(column).insertValue(row.get<uint64_t>(idx));
break;
case ValueType::vtInt8:
assert_cast<ColumnInt8 &>(column).insertValue(row.get<int16_t>(idx));
break;
case ValueType::vtInt16:
assert_cast<ColumnInt16 &>(column).insertValue(row.get<int16_t>(idx));
break;
case ValueType::vtInt32:
assert_cast<ColumnInt32 &>(column).insertValue(row.get<int32_t>(idx));
break;
case ValueType::vtInt64:
assert_cast<ColumnInt64 &>(column).insertValue(row.get<int64_t>(idx));
break;
case ValueType::vtFloat32:
assert_cast<ColumnFloat32 &>(column).insertValue(row.get<float>(idx));
break;
case ValueType::vtFloat64:
assert_cast<ColumnFloat64 &>(column).insertValue(row.get<double>(idx));
break;
case ValueType::vtFixedString:[[fallthrough]];
case ValueType::vtEnum8:
case ValueType::vtEnum16:
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case ValueType::vtString:
assert_cast<ColumnString &>(column).insert(row.get<std::string>(idx));
break;
case ValueType::vtUUID:
{
auto value = row.get<std::string>(idx);
assert_cast<ColumnUInt128 &>(column).insert(parse<UUID>(value.data(), value.size()));
break;
}
case ValueType::vtDate:
assert_cast<ColumnUInt16 &>(column).insertValue(UInt16{LocalDate{row.get<std::string>(idx)}.getDayNum()});
break;
case ValueType::vtDateTime:
{
auto value = row.get<std::string>(idx);
ReadBufferFromString in(value);
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time_t time = 0;
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readDateTimeText(time, in, assert_cast<const DataTypeDateTime *>(data_type.get())->getTimeZone());
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if (time < 0)
time = 0;
assert_cast<ColumnUInt32 &>(column).insertValue(time);
break;
}
case ValueType::vtDateTime64:[[fallthrough]];
case ValueType::vtDecimal32: [[fallthrough]];
case ValueType::vtDecimal64: [[fallthrough]];
case ValueType::vtDecimal128: [[fallthrough]];
case ValueType::vtDecimal256:
{
auto value = row.get<std::string>(idx);
ReadBufferFromString istr(value);
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data_type->getDefaultSerialization()->deserializeWholeText(column, istr, FormatSettings{});
break;
}
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default:
throw Exception("Unsupported value type", ErrorCodes::UNKNOWN_TYPE);
}
}
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}