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https://github.com/GreptimeTeam/greptimedb.git
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37dcf34bb9
* fix: avoid caching empty batches in row group * fix: clippy * Update tests/cases/standalone/common/select/last_value.sql * fix: sqlness
70 lines
3.5 KiB
Plaintext
70 lines
3.5 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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) with (append_mode='true');
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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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admin flush_table('t');
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+------------------------+
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| ADMIN flush_table('t') |
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+------------------------+
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| 0 |
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+------------------------+
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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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order by host;
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+---------------------------------------------------+-----------------------------------------------------+--------------------------------------------------+
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| 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] |
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+---------------------------------------------------+-----------------------------------------------------+--------------------------------------------------+
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| a | 🌓 | 7.0 |
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| b | 🌒 | 6.0 |
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| c | 🌔 | 8.0 |
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| d | 🌕 | 9.0 |
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+---------------------------------------------------+-----------------------------------------------------+--------------------------------------------------+
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-- repeat the query again, ref: https://github.com/GreptimeTeam/greptimedb/issues/4650
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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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order by host;
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+---------------------------------------------------+-----------------------------------------------------+--------------------------------------------------+
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| 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] |
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+---------------------------------------------------+-----------------------------------------------------+--------------------------------------------------+
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| a | 🌓 | 7.0 |
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| b | 🌒 | 6.0 |
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| c | 🌔 | 8.0 |
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| d | 🌕 | 9.0 |
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+---------------------------------------------------+-----------------------------------------------------+--------------------------------------------------+
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drop table t;
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Affected Rows: 0
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