mirror of
https://github.com/GreptimeTeam/greptimedb.git
synced 2026-05-28 19:00:39 +00:00
56 lines
2.0 KiB
Plaintext
56 lines
2.0 KiB
Plaintext
create table t (
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ts timestamp time index,
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host string primary key,
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not_pk string,
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val double,
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);
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Affected Rows: 0
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insert into t values
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(0, 'a', '🌕', 1.0),
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(1, 'b', '🌖', 2.0),
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(2, 'a', '🌗', 3.0),
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(3, 'c', '🌘', 4.0),
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(4, 'a', '🌑', 5.0),
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(5, 'b', '🌒', 6.0),
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(6, 'a', '🌓', 7.0),
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(7, 'c', '🌔', 8.0),
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(8, 'd', '🌕', 9.0);
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Affected Rows: 9
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-- SQLNESS REPLACE (metrics.*) REDACTED
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-- SQLNESS REPLACE (partitioning.*) REDACTED
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-- SQLNESS REPLACE \-+
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-- SQLNESS REPLACE (\s\s+) _
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explain analyze
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select
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last_value(host order by ts),
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last_value(not_pk order by ts),
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last_value(val order by ts)
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from t
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group by host;
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++++
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| stage | node | plan_|
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++++
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| 0_| 0_|_MergeScanExec: peers=[5695126634496(1326, 0), ] REDACTED
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| 1_| 0_|_ProjectionExec: expr=[last_value(t.host) ORDER BY [t.ts ASC NULLS LAST]@1 as last_value(t.host) ORDER BY [t.ts ASC NULLS LAST], last_value(t.not_pk) ORDER BY [t.ts ASC NULLS LAST]@2 as last_value(t.not_pk) ORDER BY [t.ts ASC NULLS LAST], last_value(t.val) ORDER BY [t.ts ASC NULLS LAST]@3 as last_value(t.val) ORDER BY [t.ts ASC NULLS LAST]] REDACTED
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|_|_|_AggregateExec: mode=FinalPartitioned, gby=[host@0 as host], aggr=[last_value(t.host) ORDER BY [t.ts ASC NULLS LAST], last_value(t.not_pk) ORDER BY [t.ts ASC NULLS LAST], last_value(t.val) ORDER BY [t.ts ASC NULLS LAST]] REDACTED
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|_|_|_CoalesceBatchesExec: target_batch_size=8192 REDACTED
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|_|_|_RepartitionExec: REDACTED
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|_|_|_CoalesceBatchesExec: target_batch_size=8192 REDACTED
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|_|_|_AggregateExec: mode=Partial, gby=[host@1 as host], aggr=[last_value(t.host) ORDER BY [t.ts ASC NULLS LAST], last_value(t.not_pk) ORDER BY [t.ts ASC NULLS LAST], last_value(t.val) ORDER BY [t.ts ASC NULLS LAST]] REDACTED
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|_|_|_RepartitionExec: REDACTED
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|_|_|_SeqScan: partition_count=1 (1 memtable ranges, 0 file ranges), selector=LastRow REDACTED
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|_|_|_|
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|_|_| Total rows: 4_|
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++++
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drop table t;
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Affected Rows: 0
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