Reduce memory usage during prefetches of JSON column in Wide parts#77640
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Avogar merged 2 commits intoClickHouse:masterfrom Mar 17, 2025
Merged
Reduce memory usage during prefetches of JSON column in Wide parts#77640Avogar merged 2 commits intoClickHouse:masterfrom
Avogar merged 2 commits intoClickHouse:masterfrom
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For example: clickhouse-cloud :) select * from test where y = 1 format Null settings max_parallel_replicas=1
0 rows in set. Elapsed: 8.283 sec. Processed 1.00 million rows, 8.12 MB (120.73 thousand rows/s., 979.72 KB/s.)
Peak memory usage: 69.16 GiB.Now: clickhouse-cloud :) select * from test where y = 1 format Null settings max_parallel_replicas=1
0 rows in set. Elapsed: 0.351 sec. Processed 1.00 million rows, 8.11 MB (2.85 million rows/s., 23.15 MB/s.)
Peak memory usage: 1.11 GiB. |
nickitat
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Mar 14, 2025
nickitat
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Mar 14, 2025
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Reduce memory usage during prefetches of JSON column in Wide parts
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