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@ -20,7 +20,7 @@ Subquery is another `SELECT` query that may be specified in parenthesis inside `
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When `FINAL` is specified, ClickHouse fully merges the data before returning the result and thus performs all data transformations that happen during merges for the given table engine.
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It is applicable when selecting data from tables that use the [MergeTree](../../../engines/table-engines/mergetree-family/mergetree.md)-engine family (except `GraphiteMergeTree`). Also supported for:
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It is applicable when selecting data from tables that use the [MergeTree](../../../engines/table-engines/mergetree-family/mergetree.md)-engine family. Also supported for:
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- [Replicated](../../../engines/table-engines/mergetree-family/replication.md) versions of `MergeTree` engines.
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- [View](../../../engines/table-engines/special/view.md), [Buffer](../../../engines/table-engines/special/buffer.md), [Distributed](../../../engines/table-engines/special/distributed.md), and [MaterializedView](../../../engines/table-engines/special/materializedview.md) engines that operate over other engines, provided they were created over `MergeTree`-engine tables.
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@ -20,7 +20,7 @@ toc_title: FROM
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Если в запросе используется модификатор `FINAL`, то ClickHouse полностью мёржит данные перед выдачей результата, таким образом выполняя все преобразования данных, которые производятся движком таблиц при мёржах.
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Он применим при выборе данных из таблиц, использующих [MergeTree](../../../engines/table-engines/mergetree-family/mergetree.md)- семейство движков (кроме `GraphiteMergeTree`). Также поддерживается для:
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Он применим при выборе данных из таблиц, использующих [MergeTree](../../../engines/table-engines/mergetree-family/mergetree.md)- семейство движков. Также поддерживается для:
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- [Replicated](../../../engines/table-engines/mergetree-family/replication.md) варианты исполнения `MergeTree` движков.
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- [View](../../../engines/table-engines/special/view.md), [Buffer](../../../engines/table-engines/special/buffer.md), [Distributed](../../../engines/table-engines/special/distributed.md), и [MaterializedView](../../../engines/table-engines/special/materializedview.md), которые работают поверх других движков, если они созданы для таблиц с движками семейства `MergeTree`.
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@ -20,7 +20,7 @@ toc_title: FROM
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当 `FINAL` 被指定,ClickHouse会在返回结果之前完全合并数据,从而执行给定表引擎合并期间发生的所有数据转换。
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它适用于从使用 [MergeTree](../../../engines/table-engines/mergetree-family/mergetree.md)-引擎族(除了 `GraphiteMergeTree`). 还支持:
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它适用于从使用 [MergeTree](../../../engines/table-engines/mergetree-family/mergetree.md)-引擎族. 还支持:
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- [Replicated](../../../engines/table-engines/mergetree-family/replication.md) 版本 `MergeTree` 引擎
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- [View](../../../engines/table-engines/special/view.md), [Buffer](../../../engines/table-engines/special/buffer.md), [Distributed](../../../engines/table-engines/special/distributed.md),和 [MaterializedView](../../../engines/table-engines/special/materializedview.md) 在其他引擎上运行的引擎,只要是它们底层是 `MergeTree`-引擎表即可。
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@ -9,6 +9,7 @@
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#include <Processors/Sources/NullSource.h>
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#include <Processors/Merges/AggregatingSortedTransform.h>
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#include <Processors/Merges/CollapsingSortedTransform.h>
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#include <Processors/Merges/GraphiteRollupSortedTransform.h>
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#include <Processors/Merges/MergingSortedTransform.h>
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#include <Processors/Merges/ReplacingSortedTransform.h>
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#include <Processors/Merges/SummingSortedTransform.h>
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@ -506,15 +507,15 @@ static void addMergingFinal(
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const auto & header = pipe.getHeader();
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size_t num_outputs = pipe.numOutputPorts();
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auto now = time(nullptr);
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auto get_merging_processor = [&]() -> MergingTransformPtr
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{
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switch (merging_params.mode)
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{
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case MergeTreeData::MergingParams::Ordinary:
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{
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return std::make_shared<MergingSortedTransform>(header, num_outputs,
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sort_description, max_block_size);
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}
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case MergeTreeData::MergingParams::Collapsing:
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return std::make_shared<CollapsingSortedTransform>(header, num_outputs,
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@ -537,7 +538,8 @@ static void addMergingFinal(
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sort_description, merging_params.sign_column, max_block_size);
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case MergeTreeData::MergingParams::Graphite:
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throw Exception("GraphiteMergeTree doesn't support FINAL", ErrorCodes::LOGICAL_ERROR);
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return std::make_shared<GraphiteRollupSortedTransform>(header, num_outputs,
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sort_description, max_block_size, merging_params.graphite_params, now);
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}
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__builtin_unreachable();
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@ -402,11 +402,7 @@ public:
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bool supportsFinal() const override
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{
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return merging_params.mode == MergingParams::Collapsing
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|| merging_params.mode == MergingParams::Summing
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|| merging_params.mode == MergingParams::Aggregating
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|| merging_params.mode == MergingParams::Replacing
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|| merging_params.mode == MergingParams::VersionedCollapsing;
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return merging_params.mode != MergingParams::Ordinary;
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}
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bool supportsSubcolumns() const override { return true; }
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@ -32,8 +32,6 @@ WITH dates AS
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select 1, 'max_2', older_date - number * 60 - 30, number, 1, number from dates, numbers(1200) union all
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select 2, 'max_2', older_date - number * 60 - 30, number, 1, number from dates, numbers(1200);
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optimize table test_graphite final;
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select key, Path, Value, Version, col from test_graphite order by key, Path, Time desc;
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select key, Path, Value, Version, col from test_graphite order by key, Path, Time desc final;
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drop table test_graphite;
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