mirror of
https://github.com/ClickHouse/ClickHouse.git
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267 lines
8.2 KiB
C++
267 lines
8.2 KiB
C++
#include <Core/Defines.h>
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#include <IO/ReadHelpers.h>
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#include <IO/VarInt.h>
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#include <Compression/CompressedReadBufferFromFile.h>
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#include <DataTypes/DataTypeFactory.h>
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#include <Common/typeid_cast.h>
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#include <ext/range.h>
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#include <DataStreams/NativeBlockInputStream.h>
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#include <DataTypes/DataTypeLowCardinality.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int INCORRECT_INDEX;
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extern const int LOGICAL_ERROR;
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extern const int CANNOT_READ_ALL_DATA;
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extern const int NOT_IMPLEMENTED;
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}
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NativeBlockInputStream::NativeBlockInputStream(ReadBuffer & istr_, UInt64 server_revision_)
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: istr(istr_), server_revision(server_revision_)
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{
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}
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NativeBlockInputStream::NativeBlockInputStream(ReadBuffer & istr_, const Block & header_, UInt64 server_revision_)
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: istr(istr_), header(header_), server_revision(server_revision_)
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{
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}
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NativeBlockInputStream::NativeBlockInputStream(ReadBuffer & istr_, UInt64 server_revision_,
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IndexForNativeFormat::Blocks::const_iterator index_block_it_,
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IndexForNativeFormat::Blocks::const_iterator index_block_end_)
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: istr(istr_), server_revision(server_revision_),
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use_index(true), index_block_it(index_block_it_), index_block_end(index_block_end_)
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{
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istr_concrete = typeid_cast<CompressedReadBufferFromFile *>(&istr);
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if (!istr_concrete)
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throw Exception("When need to use index for NativeBlockInputStream, istr must be CompressedReadBufferFromFile.", ErrorCodes::LOGICAL_ERROR);
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if (index_block_it == index_block_end)
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return;
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index_column_it = index_block_it->columns.begin();
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/// Initialize header from the index.
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for (const auto & column : index_block_it->columns)
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{
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auto type = DataTypeFactory::instance().get(column.type);
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header.insert(ColumnWithTypeAndName{ type, column.name });
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}
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}
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// also resets few vars from IBlockInputStream (I didn't want to propagate resetParser upthere)
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void NativeBlockInputStream::resetParser()
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{
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istr_concrete = nullptr;
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use_index = false;
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#ifndef NDEBUG
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read_prefix_is_called = false;
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read_suffix_is_called = false;
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#endif
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is_cancelled.store(false);
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is_killed.store(false);
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}
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void NativeBlockInputStream::readData(const IDataType & type, IColumn & column, ReadBuffer & istr, size_t rows, double avg_value_size_hint)
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{
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IDataType::DeserializeBinaryBulkSettings settings;
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settings.getter = [&](IDataType::SubstreamPath) -> ReadBuffer * { return &istr; };
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settings.avg_value_size_hint = avg_value_size_hint;
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settings.position_independent_encoding = false;
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IDataType::DeserializeBinaryBulkStatePtr state;
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type.deserializeBinaryBulkStatePrefix(settings, state);
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type.deserializeBinaryBulkWithMultipleStreams(column, rows, settings, state);
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if (column.size() != rows)
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throw Exception("Cannot read all data in NativeBlockInputStream. Rows read: " + toString(column.size()) + ". Rows expected: " + toString(rows) + ".",
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ErrorCodes::CANNOT_READ_ALL_DATA);
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}
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Block NativeBlockInputStream::getHeader() const
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{
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return header;
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}
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Block NativeBlockInputStream::readImpl()
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{
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Block res;
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const DataTypeFactory & data_type_factory = DataTypeFactory::instance();
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if (use_index && index_block_it == index_block_end)
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return res;
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if (istr.eof())
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{
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if (use_index)
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throw Exception("Input doesn't contain all data for index.", ErrorCodes::CANNOT_READ_ALL_DATA);
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return res;
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}
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/// Additional information about the block.
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if (server_revision > 0)
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res.info.read(istr);
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/// Dimensions
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size_t columns = 0;
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size_t rows = 0;
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if (!use_index)
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{
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readVarUInt(columns, istr);
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readVarUInt(rows, istr);
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}
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else
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{
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columns = index_block_it->num_columns;
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rows = index_block_it->num_rows;
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}
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for (size_t i = 0; i < columns; ++i)
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{
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if (use_index)
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{
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/// If the current position is what is required, the real seek does not occur.
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istr_concrete->seek(index_column_it->location.offset_in_compressed_file, index_column_it->location.offset_in_decompressed_block);
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}
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ColumnWithTypeAndName column;
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/// Name
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readBinary(column.name, istr);
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/// Type
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String type_name;
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readBinary(type_name, istr);
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column.type = data_type_factory.get(type_name);
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if (use_index)
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{
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/// Index allows to do more checks.
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if (index_column_it->name != column.name)
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throw Exception("Index points to column with wrong name: corrupted index or data", ErrorCodes::INCORRECT_INDEX);
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if (index_column_it->type != type_name)
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throw Exception("Index points to column with wrong type: corrupted index or data", ErrorCodes::INCORRECT_INDEX);
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}
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/// Data
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MutableColumnPtr read_column = column.type->createColumn();
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double avg_value_size_hint = avg_value_size_hints.empty() ? 0 : avg_value_size_hints[i];
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if (rows) /// If no rows, nothing to read.
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readData(*column.type, *read_column, istr, rows, avg_value_size_hint);
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column.column = std::move(read_column);
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if (header)
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{
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/// Support insert from old clients without low cardinality type.
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auto & header_column = header.getByName(column.name);
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if (!header_column.type->equals(*column.type))
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{
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column.column = recursiveTypeConversion(column.column, column.type, header.getByPosition(i).type);
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column.type = header.getByPosition(i).type;
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}
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}
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res.insert(std::move(column));
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if (use_index)
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++index_column_it;
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}
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if (use_index)
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{
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if (index_column_it != index_block_it->columns.end())
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throw Exception("Inconsistent index: not all columns were read", ErrorCodes::INCORRECT_INDEX);
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++index_block_it;
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if (index_block_it != index_block_end)
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index_column_it = index_block_it->columns.begin();
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}
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if (rows && header)
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{
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/// Allow to skip columns. Fill them with default values.
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Block tmp_res;
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for (auto & col : header)
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{
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if (res.has(col.name))
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tmp_res.insert(res.getByName(col.name));
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else
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tmp_res.insert({col.type->createColumn()->cloneResized(rows), col.type, col.name});
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}
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res.swap(tmp_res);
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}
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return res;
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}
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void NativeBlockInputStream::updateAvgValueSizeHints(const Block & block)
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{
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auto rows = block.rows();
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if (rows < 10)
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return;
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avg_value_size_hints.resize_fill(block.columns(), 0);
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for (auto idx : ext::range(0, block.columns()))
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{
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auto & avg_value_size_hint = avg_value_size_hints[idx];
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IDataType::updateAvgValueSizeHint(*block.getByPosition(idx).column, avg_value_size_hint);
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}
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}
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void IndexForNativeFormat::read(ReadBuffer & istr, const NameSet & required_columns)
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{
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while (!istr.eof())
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{
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blocks.emplace_back();
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IndexOfBlockForNativeFormat & block = blocks.back();
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readVarUInt(block.num_columns, istr);
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readVarUInt(block.num_rows, istr);
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if (block.num_columns < required_columns.size())
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throw Exception("Index contain less than required columns", ErrorCodes::INCORRECT_INDEX);
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for (size_t i = 0; i < block.num_columns; ++i)
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{
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IndexOfOneColumnForNativeFormat column_index;
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readBinary(column_index.name, istr);
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readBinary(column_index.type, istr);
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readBinary(column_index.location.offset_in_compressed_file, istr);
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readBinary(column_index.location.offset_in_decompressed_block, istr);
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if (required_columns.count(column_index.name))
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block.columns.push_back(std::move(column_index));
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}
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if (block.columns.size() < required_columns.size())
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throw Exception("Index contain less than required columns", ErrorCodes::INCORRECT_INDEX);
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if (block.columns.size() > required_columns.size())
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throw Exception("Index contain duplicate columns", ErrorCodes::INCORRECT_INDEX);
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block.num_columns = block.columns.size();
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}
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}
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}
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