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https://github.com/ClickHouse/ClickHouse.git
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1c0e0ea1e4
Support of sharded dictionary for updatable sources is questionable since: - sharded dictionary developed for hashed dictionary with a huge number of keys - updatable source requires storing the whole table in memory (due to how reload works) - also it is an open question will it have some benefits from the updatable source or not, since using updatable source with a huge number of changes in the source does not looks optimal and on the other side if there are small amount of changes the you don't need sharded dictionary at all Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
45 lines
2.8 KiB
SQL
45 lines
2.8 KiB
SQL
drop dictionary if exists dict;
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drop dictionary if exists dict_10;
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drop dictionary if exists dict_10_uint8;
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drop dictionary if exists dict_10_string;
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drop dictionary if exists dict_10_incremental;
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drop dictionary if exists complex_dict_10;
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drop table if exists data;
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drop table if exists data_string;
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drop table if exists complex_data;
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create table data (key UInt64, value UInt16) engine=Memory() as select number, number from numbers(1e5);
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create table data_string (key String, value UInt16) engine=Memory() as select 'foo' || number::String, number from numbers(1e5);
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create table complex_data (k1 UInt64, k2 UInt64, value UInt16) engine=Memory() as select number, number, number from numbers(1e5);
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-- { echoOn }
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create dictionary dict (key UInt64, value UInt16) primary key key source(clickhouse(table data)) layout(sparse_hashed()) lifetime(0);
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show create dict;
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system reload dictionary dict;
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select element_count from system.dictionaries where database = currentDatabase() and name = 'dict';
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select count() from data where dictGetUInt16('dict', 'value', key) != value;
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create dictionary dict_10 (key UInt64, value UInt16) primary key key source(clickhouse(table data)) layout(sparse_hashed(shards 10)) lifetime(0);
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show create dict_10;
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system reload dictionary dict_10;
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select element_count from system.dictionaries where database = currentDatabase() and name = 'dict_10';
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select count() from data where dictGetUInt16('dict_10', 'value', key) != value;
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create dictionary dict_10_uint8 (key UInt8, value UInt16) primary key key source(clickhouse(table data)) layout(sparse_hashed(shards 10)) lifetime(0);
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show create dict_10_uint8;
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system reload dictionary dict_10_uint8;
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select element_count from system.dictionaries where database = currentDatabase() and name = 'dict_10';
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select count() from data where dictGetUInt16('dict_10_uint8', 'value', key) != value;
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create dictionary dict_10_string (key String, value UInt16) primary key key source(clickhouse(table data_string)) layout(sparse_hashed(shards 10)) lifetime(0);
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show create dict_10_string;
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system reload dictionary dict_10_string; -- { serverError CANNOT_PARSE_TEXT }
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create dictionary dict_10_incremental (key UInt64, value UInt16) primary key key source(clickhouse(table data_last_access update_field last_access)) layout(sparse_hashed(shards 10)) lifetime(0);
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system reload dictionary dict_10_incremental; -- { serverError BAD_ARGUMENTS }
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create dictionary complex_dict_10 (k1 UInt64, k2 UInt64, value UInt16) primary key k1, k2 source(clickhouse(table complex_data)) layout(complex_key_sparse_hashed(shards 10)) lifetime(0);
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system reload dictionary complex_dict_10;
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select element_count from system.dictionaries where database = currentDatabase() and name = 'complex_dict_10';
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select count() from complex_data where dictGetUInt16('complex_dict_10', 'value', (k1, k2)) != value;
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