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808d1a0215
It was initially implemented in #15454, but was reverted in #21948 (due to higher memory usage). This implementation differs from the initial, since now there is separate attribute to enable preallocation, before it was done automatically, but this has problems with duplicates in the source. Plus this implementation does not uses dynamic_cast, instead it extends IDictionarySource interface.
10 lines
578 B
Plaintext
10 lines
578 B
Plaintext
CREATE DICTIONARY default.dict_01509\n(\n `key` UInt64,\n `value` String DEFAULT \'-\'\n)\nPRIMARY KEY key\nSOURCE(CLICKHOUSE(HOST \'localhost\' PORT tcpPort() TABLE \'data_01509\'))\nLIFETIME(MIN 0 MAX 0)\nLAYOUT(SPARSE_HASHED(PREALLOCATE 0))
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CREATE DICTIONARY default.dict_01509_preallocate\n(\n `key` UInt64,\n `value` String DEFAULT \'-\'\n)\nPRIMARY KEY key\nSOURCE(CLICKHOUSE(HOST \'localhost\' PORT tcpPort() TABLE \'data_01509\'))\nLIFETIME(MIN 0 MAX 0)\nLAYOUT(SPARSE_HASHED(PREALLOCATE 1))
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HashedDictionary: Preallocated 10000 elements
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0
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10000
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10000
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