Logstash

LookML

LoongArch

LowCardinality

LpDistance

LpNorm

london

lookups

loongarch

lowCardinalityIndices

lowCardinalityKeys

lowcardinality

add_contrib (bech32)

`FPC(level, float_size)` - Repeatedly predicts the next floating point value in the sequence using the better of two predictors, then XORs the actual with the predicted value, and leading-zero compresses the result. Similar to Gorilla, this is efficient when storing a series of floating point values that change slowly. For 64-bit values (double), FPC is faster than Gorilla, for 32-bit values your mileage may vary. Possible `level` values: 1-28, the default value is 12. Possible `float_size` values: 4, 8, the default value is `sizeof(type)` if type is Float. In all other cases, it's 4. For a detailed description of the algorithm see [High Throughput Compression of Double-Precision Floating-Point Data](https://userweb.cs.txstate.edu/~burtscher/papers/dcc07a.pdf).

`T64` — Compression approach that crops unused high bits of values in integer data types (including `Enum`, `Date` and `DateTime`). At each step of its algorithm, codec takes a block of 64 values, puts them into 64x64 bit matrix, transposes it, crops the unused bits of values and returns the rest as a sequence. Unused bits are the bits, that do not differ between maximum and minimum values in the whole data part for which the compression is used.

add_headers_and_sources(clickhouse_compression Compression)

add_library(clickhouse_compression ${clickhouse_compression_headers} ${clickhouse_compression_sources})

add_headers_and_sources(dbms Disks/IO)

add_headers_and_sources(dbms Disks/ObjectStorages)

if (TARGET ch_contrib::sqlite)

#cmakedefine01 USE_SQLITE

#cmakedefine01 USE_NURAFT

#cmakedefine01 USE_KRB5

#cmakedefine01 USE_FILELOG

#cmakedefine01 USE_BLAKE3

#cmakedefine01 USE_USEARCH

bool isGenericCompression() const override { return true; }

bool isDeflateQpl() const override { return true; }

{

return "Requires hardware support for Intel’s QuickAssist Technology for DEFLATE compression; enhanced performance for specific hardware.";

}