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d019c4e3b3
force_optimize_skip_unused_shards_no_nested will disable force_optimize_skip_unused_shards for nested Distributed tables. Can be useful for multi-layred/bi-level sharding.
43 lines
1.7 KiB
SQL
43 lines
1.7 KiB
SQL
set optimize_skip_unused_shards=1;
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drop table if exists data_01071;
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drop table if exists dist_01071;
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drop table if exists data2_01071;
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drop table if exists dist2_01071;
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drop table if exists dist2_layer_01071;
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create table data_01071 (key Int) Engine=Null();
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create table dist_01071 as data_01071 Engine=Distributed(test_cluster_two_shards, currentDatabase(), data_01071);
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set force_optimize_skip_unused_shards=0;
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select * from dist_01071;
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set force_optimize_skip_unused_shards=1;
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select * from dist_01071;
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set force_optimize_skip_unused_shards=2;
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select * from dist_01071; -- { serverError 507 }
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drop table if exists dist_01071;
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create table dist_01071 as data_01071 Engine=Distributed(test_cluster_two_shards, currentDatabase(), data_01071, key%2);
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set force_optimize_skip_unused_shards=0;
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select * from dist_01071;
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set force_optimize_skip_unused_shards=1;
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select * from dist_01071; -- { serverError 507 }
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set force_optimize_skip_unused_shards=2;
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select * from dist_01071; -- { serverError 507 }
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drop table if exists data_01071;
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drop table if exists dist_01071;
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-- Distributed on Distributed
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set distributed_group_by_no_merge=1;
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set force_optimize_skip_unused_shards=2;
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create table data2_01071 (key Int, sub_key Int) Engine=Null();
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create table dist2_layer_01071 as data2_01071 Engine=Distributed(test_cluster_two_shards, currentDatabase(), data2_01071, sub_key%2);
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create table dist2_01071 as data2_01071 Engine=Distributed(test_cluster_two_shards, currentDatabase(), dist2_layer_01071, key%2);
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select * from dist2_01071 where key = 1; -- { serverError 507 }
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set force_optimize_skip_unused_shards_no_nested=1;
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select * from dist2_01071 where key = 1;
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drop table if exists data2_01071;
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drop table if exists dist2_layer_01071;
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drop table if exists dist2_01071;
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