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134 lines
4.6 KiB
Plaintext
134 lines
4.6 KiB
Plaintext
-- { echoOn } --
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explain pipeline select a from remote(test_cluster_two_shards, currentDatabase(), t) group by a;
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(Expression)
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ExpressionTransform × 4
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(MergingAggregated)
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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FinishAggregatingInOrderTransform 2 → 1
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(Union)
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(Aggregating)
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SortingAggregatedForMemoryBoundMergingTransform 4 → 1
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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FinishAggregatingInOrderTransform 4 → 1
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AggregatingInOrderTransform × 4
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(Expression)
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ExpressionTransform × 4
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(ReadFromMergeTree)
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MergeTreeSelect(pool: ReadPoolInOrder, algorithm: InOrder) × 4 0 → 1
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(ReadFromRemote)
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select a from remote(test_cluster_two_shards, currentDatabase(), t) group by a order by a limit 5 offset 100500;
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100500
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100501
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100502
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100503
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100504
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explain pipeline select a from remote(test_cluster_two_shards, currentDatabase(), dist_t) group by a;
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(Expression)
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ExpressionTransform × 4
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(MergingAggregated)
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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FinishAggregatingInOrderTransform 2 → 1
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(Union)
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(MergingAggregated)
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SortingAggregatedForMemoryBoundMergingTransform 4 → 1
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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FinishAggregatingInOrderTransform 2 → 1
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(Union)
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(Aggregating)
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SortingAggregatedForMemoryBoundMergingTransform 4 → 1
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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FinishAggregatingInOrderTransform 4 → 1
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AggregatingInOrderTransform × 4
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(Expression)
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ExpressionTransform × 4
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(ReadFromMergeTree)
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MergeTreeSelect(pool: ReadPoolInOrder, algorithm: InOrder) × 4 0 → 1
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(ReadFromRemote)
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(ReadFromRemote)
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select a from remote(test_cluster_two_shards, currentDatabase(), dist_t) group by a order by a limit 5 offset 100500;
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100500
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100501
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100502
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100503
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100504
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1
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-- { echoOn } --
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explain pipeline select a, count() from dist_t_different_dbs group by a order by a limit 5 offset 500;
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(Expression)
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ExpressionTransform
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(Limit)
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Limit
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(Sorting)
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MergingSortedTransform 4 → 1
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MergeSortingTransform × 4
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LimitsCheckingTransform × 4
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PartialSortingTransform × 4
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(Expression)
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ExpressionTransform × 4
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(MergingAggregated)
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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FinishAggregatingInOrderTransform 2 → 1
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(Union)
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(Aggregating)
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SortingAggregatedForMemoryBoundMergingTransform 4 → 1
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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FinishAggregatingInOrderTransform 4 → 1
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AggregatingInOrderTransform × 4
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(Expression)
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ExpressionTransform × 4
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(ReadFromMergeTree)
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MergeTreeSelect(pool: ReadPoolInOrder, algorithm: InOrder) × 4 0 → 1
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(ReadFromRemote)
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select a, count() from dist_t_different_dbs group by a order by a limit 5 offset 500;
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500 2000
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501 2000
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502 2000
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503 2000
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504 2000
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select a, count() from dist_t_different_dbs group by a, b order by a limit 5 offset 500;
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500 2000
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501 2000
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502 2000
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503 2000
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504 2000
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1000000
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-- { echoOn } --
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explain pipeline select a from pr_t group by a order by a limit 5 offset 500;
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(Expression)
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ExpressionTransform
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(Limit)
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Limit
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(Sorting)
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MergingSortedTransform 4 → 1
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MergeSortingTransform × 4
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LimitsCheckingTransform × 4
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PartialSortingTransform × 4
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(Expression)
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ExpressionTransform × 4
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(MergingAggregated)
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Resize 1 → 4
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SortingAggregatedTransform 4 → 1
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MergingAggregatedBucketTransform × 4
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Resize 1 → 4
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GroupingAggregatedTransform 3 → 1
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(ReadFromRemoteParallelReplicas)
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select a, count() from pr_t group by a order by a limit 5 offset 500;
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500 1000
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501 1000
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502 1000
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503 1000
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504 1000
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select a, count() from pr_t group by a, b order by a limit 5 offset 500;
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500 1000
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501 1000
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502 1000
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503 1000
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504 1000
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