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25 lines
1.0 KiB
SQL
25 lines
1.0 KiB
SQL
-- https://github.com/ClickHouse/ClickHouse/issues/9587#issuecomment-944431385
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CREATE TABLE source (a Int32) ENGINE=MergeTree() ORDER BY tuple();
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CREATE TABLE source_null AS source ENGINE=Null;
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CREATE TABLE dest_a (count UInt32, min Int32, max Int32, count_subquery Int32, min_subquery Int32, max_subquery Int32) ENGINE=MergeTree() ORDER BY tuple();
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CREATE MATERIALIZED VIEW mv_null TO source_null AS SELECT * FROM source;
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CREATE MATERIALIZED VIEW mv_a to dest_a AS
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SELECT
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count() AS count,
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min(a) AS min,
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max(a) AS max,
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(SELECT count() FROM source_null) AS count_subquery,
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(SELECT min(a) FROM source_null) AS min_subquery,
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(SELECT max(a) FROM source_null) AS max_subquery
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FROM source_null
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GROUP BY count_subquery, min_subquery, max_subquery;
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SET optimize_trivial_insert_select = 1;
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INSERT INTO source SELECT number FROM numbers(2000) SETTINGS min_insert_block_size_rows=1500, max_insert_block_size=1500;
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SELECT count() FROM source;
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SELECT count() FROM dest_a;
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SELECT * from dest_a ORDER BY count DESC;
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