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Merge pull request #994 from yandex/vertical-merge-for-replacing-engines
Vertical merge for replacing engines
This commit is contained in:
alexey-milovidov
GitHub
commit
181082ca07
@ -1,5 +1,6 @@
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#include <DataStreams/ReplacingSortedBlockInputStream.h>
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#include <Columns/ColumnsNumber.h>
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#include <common/logger_useful.h>
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namespace DB
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@ -8,6 +9,16 @@ namespace DB
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void ReplacingSortedBlockInputStream::insertRow(ColumnPlainPtrs & merged_columns, size_t & merged_rows)
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{
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if (out_row_sources_buf)
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{
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/// true flag value means "skip row"
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current_row_sources.back().setSkipFlag(false);
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out_row_sources_buf->write(reinterpret_cast<const char *>(current_row_sources.data()),
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current_row_sources.size() * sizeof(RowSourcePart));
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current_row_sources.resize(0);
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}
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++merged_rows;
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for (size_t i = 0; i < num_columns; ++i)
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merged_columns[i]->insertFrom(*selected_row.columns[i], selected_row.row_num);
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@ -87,6 +98,10 @@ void ReplacingSortedBlockInputStream::merge(ColumnPlainPtrs & merged_columns, st
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current_key.swap(next_key);
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}
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/// Initially, skip all rows. Unskip last on insert.
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if (out_row_sources_buf)
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current_row_sources.emplace_back(current.impl->order, true);
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/// A non-strict comparison, since we select the last row for the same version values.
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if (version >= max_version)
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{
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@ -16,8 +16,8 @@ class ReplacingSortedBlockInputStream : public MergingSortedBlockInputStream
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{
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public:
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ReplacingSortedBlockInputStream(BlockInputStreams inputs_, const SortDescription & description_,
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const String & version_column_, size_t max_block_size_)
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: MergingSortedBlockInputStream(inputs_, description_, max_block_size_),
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const String & version_column_, size_t max_block_size_, WriteBuffer * out_row_sources_buf_ = nullptr)
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: MergingSortedBlockInputStream(inputs_, description_, max_block_size_, 0, out_row_sources_buf_),
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version_column(version_column_)
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{
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}
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@ -61,6 +61,8 @@ private:
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UInt64 max_version = 0; /// Max version for current primary key.
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PODArray<RowSourcePart> current_row_sources; /// Sources of rows with the current primary key
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template<class TSortCursor>
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void merge(ColumnPlainPtrs & merged_columns, std::priority_queue<TSortCursor> & queue);
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@ -321,6 +321,10 @@ static void extractMergingAndGatheringColumns(const NamesAndTypesList & all_colu
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if (merging_params.mode == MergeTreeData::MergingParams::Collapsing)
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key_columns.emplace(merging_params.sign_column);
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/// Force version column for Replacing mode
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if (merging_params.mode == MergeTreeData::MergingParams::Replacing)
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key_columns.emplace(merging_params.version_column);
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/// TODO: also force "summing" and "aggregating" columns to make Horizontal merge only for such columns
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for (auto & column : all_columns)
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@ -595,7 +599,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMerger::mergePartsToTemporaryPart
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case MergeTreeData::MergingParams::Replacing:
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merged_stream = std::make_unique<ReplacingSortedBlockInputStream>(
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src_streams, sort_desc, data.merging_params.version_column, DEFAULT_MERGE_BLOCK_SIZE);
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src_streams, sort_desc, data.merging_params.version_column, DEFAULT_MERGE_BLOCK_SIZE, rows_sources_write_buf.get());
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break;
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case MergeTreeData::MergingParams::Graphite:
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@ -773,7 +777,8 @@ MergeTreeDataMerger::MergeAlgorithm MergeTreeDataMerger::chooseMergeAlgorithm(
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bool is_supported_storage =
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data.merging_params.mode == MergeTreeData::MergingParams::Ordinary ||
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data.merging_params.mode == MergeTreeData::MergingParams::Collapsing;
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data.merging_params.mode == MergeTreeData::MergingParams::Collapsing ||
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data.merging_params.mode == MergeTreeData::MergingParams::Replacing;
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bool enough_ordinary_cols = gathering_columns.size() >= data.context.getMergeTreeSettings().vertical_merge_algorithm_min_columns_to_activate;
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@ -7,17 +7,16 @@
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1 1
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1 1
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1 1
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1 1
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1
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1 1
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1 1
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@ -26,18 +25,14 @@
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1 1
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1 1
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1 1
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@ -46,18 +41,14 @@
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1 1
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1 1
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1
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@ -66,18 +57,14 @@
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1 1
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1 1
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1
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1
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@ -86,18 +73,14 @@
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1 1
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1 1
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1
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@ -106,6 +89,9 @@
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1 1
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1 1
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1
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1
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1
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@ -117,4 +103,90 @@
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1 1
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1 1
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1 1
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1 1
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1 1
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1 1
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1 1
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1 1
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1 1
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@ -4,10 +4,12 @@ function create {
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clickhouse-client --query="DROP TABLE IF EXISTS test.summing"
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clickhouse-client --query="DROP TABLE IF EXISTS test.collapsing"
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clickhouse-client --query="DROP TABLE IF EXISTS test.aggregating"
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clickhouse-client --query="DROP TABLE IF EXISTS test.replacing"
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clickhouse-client --query="CREATE TABLE test.summing (d Date DEFAULT today(), x UInt64, s UInt64 DEFAULT 1) ENGINE = SummingMergeTree(d, x, 8192)"
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clickhouse-client --query="CREATE TABLE test.collapsing (d Date DEFAULT today(), x UInt64, s Int8 DEFAULT 1) ENGINE = CollapsingMergeTree(d, x, 8192, s)"
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clickhouse-client --query="CREATE TABLE test.aggregating (d Date DEFAULT today(), x UInt64, s AggregateFunction(sum, UInt64)) ENGINE = AggregatingMergeTree(d, x, 8192)"
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clickhouse-client --query="CREATE TABLE test.replacing (d Date DEFAULT today(), x UInt64, s Int8 DEFAULT 1, v UInt64) ENGINE = ReplacingMergeTree(d, (x), 8192, v)"
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}
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@ -15,6 +17,7 @@ function cleanup {
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clickhouse-client --query="DROP TABLE test.summing"
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clickhouse-client --query="DROP TABLE test.collapsing"
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clickhouse-client --query="DROP TABLE test.aggregating"
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clickhouse-client --query="DROP TABLE test.replacing"
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}
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@ -35,6 +38,9 @@ function test {
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clickhouse-client $SETTINGS --query="INSERT INTO test.aggregating (d, x, s) SELECT today() AS d, number AS x, sumState(materialize(toUInt64(1))) AS s FROM (SELECT number FROM system.numbers LIMIT $1) GROUP BY number"
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clickhouse-client $SETTINGS --query="INSERT INTO test.aggregating (d, x, s) SELECT today() AS d, number AS x, sumState(materialize(toUInt64(1))) AS s FROM (SELECT number FROM system.numbers LIMIT $2) GROUP BY number"
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clickhouse-client $SETTINGS --query="INSERT INTO test.replacing (x, v) SELECT number AS x, toUInt64(number % 3 == 0) FROM system.numbers LIMIT $1"
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clickhouse-client $SETTINGS --query="INSERT INTO test.replacing (x, v) SELECT number AS x, toUInt64(number % 3 == 1) FROM system.numbers LIMIT $2"
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clickhouse-client --query="SELECT count() = $SUM, sum(s) = $SUM FROM test.summing"
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clickhouse-client --query="OPTIMIZE TABLE test.summing"
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clickhouse-client --query="SELECT count() = $MAX, sum(s) = $SUM FROM test.summing"
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@ -47,6 +53,13 @@ function test {
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clickhouse-client --query="OPTIMIZE TABLE test.aggregating"
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clickhouse-client --query="SELECT count() = $MAX, sumMerge(s) = $SUM FROM test.aggregating"
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echo
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clickhouse-client --query="SELECT count() = $SUM, sum(s) = $SUM FROM test.replacing"
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clickhouse-client --query="OPTIMIZE TABLE test.replacing"
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clickhouse-client --query="SELECT count() = $MAX, sum(s) = $MAX FROM test.replacing"
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clickhouse-client --query="SELECT count() = sum(v) FROM test.replacing where x % 3 == 0 and x < $1"
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clickhouse-client --query="SELECT count() = sum(v) FROM test.replacing where x % 3 == 1 and x < $2"
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clickhouse-client --query="SELECT sum(v) = 0 FROM test.replacing where x % 3 == 2"
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echo
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echo
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}
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