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MCOL-5199 This patch solves the overal performance degradation introduced with a new way of char columns hashing

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in aggregation code
The patch disables padding that forces hasher to calculate over the whole 2k buffer. This patch also moves hashing code
into the common place where it belongs.
This commit is contained in:
Roman Nozdrin
2022-08-16 20:04:09 +00:00
parent 20f57b713a
commit 72e264e8ef
5 changed files with 126 additions and 88 deletions
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5
dbcon/mysql/ha_mcs_sysvars.cpp
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@ -36,9 +36,12 @@ static TYPELIB mcs_compression_type_names_lib = {array_elements(mcs_compression_
// compression type
static MYSQL_THDVAR_ENUM(compression_type, PLUGIN_VAR_RQCMDARG,
"Controls compression algorithm for create tables. Possible values are: "
"NO_COMPRESSION segment files aren't compressed; "
"SNAPPY segment files are Snappy compressed (default);"
#ifdef HAVE_LZ4
"LZ4 segment files are LZ4 compressed;",
# else
,
#endif
NULL, // check
NULL, // update
1, // default