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115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
#include <DataStreams/ColumnGathererStream.h>
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#include <common/logger_useful.h>
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#include <Common/typeid_cast.h>
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#include <IO/WriteHelpers.h>
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#include <iomanip>
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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 INCOMPATIBLE_COLUMNS;
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extern const int INCORRECT_NUMBER_OF_COLUMNS;
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extern const int EMPTY_DATA_PASSED;
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extern const int RECEIVED_EMPTY_DATA;
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}
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ColumnGathererStream::ColumnGathererStream(
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const String & column_name_, const BlockInputStreams & source_streams, ReadBuffer & row_sources_buf_,
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size_t block_preferred_size_)
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: column_name(column_name_), sources(source_streams.size()), row_sources_buf(row_sources_buf_)
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, block_preferred_size(block_preferred_size_), log(&Logger::get("ColumnGathererStream"))
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{
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if (source_streams.empty())
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throw Exception("There are no streams to gather", ErrorCodes::EMPTY_DATA_PASSED);
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children.assign(source_streams.begin(), source_streams.end());
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for (size_t i = 0; i < children.size(); ++i)
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{
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const Block & header = children[i]->getHeader();
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/// Sometimes MergeTreeReader injects additional column with partitioning key
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if (header.columns() > 2)
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throw Exception(
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"Block should have 1 or 2 columns, but contains " + toString(header.columns()),
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ErrorCodes::INCORRECT_NUMBER_OF_COLUMNS);
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if (i == 0)
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{
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column.name = column_name;
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column.type = header.getByName(column_name).type;
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column.column = column.type->createColumn();
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}
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else if (header.getByName(column_name).column->getName() != column.column->getName())
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throw Exception("Column types don't match", ErrorCodes::INCOMPATIBLE_COLUMNS);
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}
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}
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Block ColumnGathererStream::readImpl()
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{
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/// Special case: single source and there are no skipped rows
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if (children.size() == 1 && row_sources_buf.eof())
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return children[0]->read();
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if (!source_to_fully_copy && row_sources_buf.eof())
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return Block();
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MutableColumnPtr output_column = column.column->cloneEmpty();
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output_block = Block{column.cloneEmpty()};
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output_column->gather(*this);
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if (!output_column->empty())
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output_block.getByPosition(0).column = std::move(output_column);
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return output_block;
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}
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void ColumnGathererStream::fetchNewBlock(Source & source, size_t source_num)
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{
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try
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{
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source.block = children[source_num]->read();
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source.update(column_name);
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}
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catch (Exception & e)
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{
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e.addMessage("Cannot fetch required block. Stream " + children[source_num]->getName() + ", part " + toString(source_num));
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throw;
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}
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if (0 == source.size)
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{
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throw Exception("Fetched block is empty. Stream " + children[source_num]->getName() + ", part " + toString(source_num),
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ErrorCodes::RECEIVED_EMPTY_DATA);
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}
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}
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void ColumnGathererStream::readSuffixImpl()
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{
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const BlockStreamProfileInfo & profile_info = getProfileInfo();
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/// Don't print info for small parts (< 10M rows)
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if (profile_info.rows < 10000000)
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return;
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double seconds = profile_info.total_stopwatch.elapsedSeconds();
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std::stringstream message;
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message << std::fixed << std::setprecision(2)
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<< "Gathered column " << column_name
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<< " (" << static_cast<double>(profile_info.bytes) / profile_info.rows << " bytes/elem.)"
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<< " in " << seconds << " sec.";
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if (seconds)
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message << ", " << profile_info.rows / seconds << " rows/sec., "
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<< profile_info.bytes / 1048576.0 / seconds << " MiB/sec.";
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LOG_TRACE(log, message.str());
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}
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}
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