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MDEV-4402 A function to visualize histograms data.

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unknown 2013-04-20 23:30:21 +03:00
parent 7efad6330f
commit 2e830cfbc8
6 changed files with 190 additions and 2 deletions
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59
mysql-test/r/statistics.result
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@ -1416,6 +1416,65 @@ WORLD_INNODB CITY Country 1 17.5819
WORLD_INNODB COUNTRYLANGUAGE PRIMARY 1 4.2232
WORLD_INNODB COUNTRYLANGUAGE PRIMARY 2 1.0000
WORLD_INNODB COUNTRYLANGUAGE Percentage 1 2.7640
set use_stat_tables='preferably';
set histogram_size=100;
set histogram_type='SINGLE_PREC_HB';
ANALYZE TABLE CountryLanguage;
set histogram_size=255;
set histogram_type='DOUBLE_PREC_HB';
ANALYZE TABLE City;
select db_name,table_name,column_name,min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(histogram,hist_type) from mysql.column_stats where table_name='CountryLanguage' and column_name = 'Percentage';;
db_name world
table_name CountryLanguage
column_name Percentage
min_value 0.0
max_value 99.9
nulls_ratio 0.0000
avg_length 4.0000
avg_frequency 2.7640
hist_size 0
hist_type NULL
hex(histogram) NULL
decode_histogram(histogram,hist_type) NULL
db_name world_innodb
table_name CountryLanguage
column_name Percentage
min_value 0.0
max_value 99.9
nulls_ratio 0.0000
avg_length 4.0000
avg_frequency 2.7640
hist_size 100
hist_type SINGLE_PREC_HB
hex(histogram) 0000000000000000000000000101010101010101010202020303030304040404050505050606070707080809090A0A0B0C0D0D0E0E0F10111213131415161718191B1C1E202224292A2E33373B4850575F6A76818C9AA7B9C4CFDADFE5EBF0F4F8FAFCFF
decode_histogram(histogram,hist_type) 0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.004,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.004,0.000,0.000,0.004,0.000,0.000,0.000,0.004,0.000,0.000,0.000,0.004,0.000,0.000,0.000,0.004,0.000,0.004,0.000,0.000,0.004,0.000,0.004,0.000,0.004,0.000,0.004,0.004,0.004,0.000,0.004,0.000,0.004,0.004,0.004,0.004,0.004,0.000,0.004,0.004,0.004,0.004,0.004,0.004,0.008,0.004,0.008,0.008,0.008,0.008,0.020,0.004,0.016,0.020,0.016,0.016,0.051,0.031,0.027,0.031,0.043,0.047,0.043,0.043,0.055,0.051,0.071,0.043,0.043,0.043,0.020,0.024,0.024,0.020,0.016,0.016,0.008,0.008,0.012
select db_name,table_name,column_name,min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(histogram,hist_type) from mysql.column_stats where table_name='City' and column_name = 'Population';;
db_name world
table_name City
column_name Population
min_value 42
max_value 10500000
nulls_ratio 0.0000
avg_length 4.0000
avg_frequency 1.0467
hist_size 0
hist_type NULL
hex(histogram) NULL
decode_histogram(histogram,hist_type) NULL
db_name world_innodb
table_name City
column_name Population
min_value 42
max_value 10500000
nulls_ratio 0.0000
avg_length 4.0000
avg_frequency 1.0467
hist_size 255
hist_type DOUBLE_PREC_HB
hex(histogram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
decode_histogram(histogram,hist_type) 0.00047,0.00198,0.00601,0.00008,0.00008,0.00005,0.00011,0.00006,0.00009,0.00008,0.00006,0.00009,0.00008,0.00009,0.00008,0.00009,0.00006,0.00006,0.00008,0.00008,0.00008,0.00011,0.00009,0.00008,0.00009,0.00006,0.00011,0.00006,0.00012,0.00012,0.00012,0.00012,0.00011,0.00011,0.00014,0.00011,0.00011,0.00011,0.00014,0.00006,0.00011,0.00009,0.00011,0.00009,0.00015,0.00015,0.00015,0.00009,0.00018,0.00015,0.00015,0.00015,0.00017,0.00018,0.00018,0.00015,0.00018,0.00020,0.00024,0.00021,0.00023,0.00027,0.00024,0.00024,0.00027,0.00023,0.00020,0.00029,0.00020,0.00027,0.00020,0.00027,0.00026,0.00034,0.00024,0.00034,0.00031,0.00037,0.00043,0.00038,0.00038,0.00035,0.00047,0.00056,0.00058,0.00041,0.00047,0.00056,0.00072,0.00044,0.00060,0.00072,0.00061,0.00072,0.00066,0.00085,0.00075,0.00078,0.00082,0.00073,0.00108,0.00089,0.00105,0.00105,0.00151,0.00150,0.00110,0.00145,0.00163,0.00160,0.00165,0.00232,0.00201,0.00371,0.00365,0.00383,0.00459,0.00583,0.00662,0.00984,0.00969,0.01080,0.01379,0.02063,0.04308,0.05960,0.15816
set histogram_type=default;
set histogram_size=default;
use test;
DROP DATABASE world;
SELECT UPPER(db_name), UPPER(table_name), cardinality

16
mysql-test/t/statistics.test
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@ -564,6 +564,22 @@ SELECT UPPER(db_name), UPPER(table_name),
index_name, prefix_arity, avg_frequency
FROM mysql.index_stats;
set use_stat_tables='preferably';
--disable_result_log
set histogram_size=100;
set histogram_type='SINGLE_PREC_HB';
ANALYZE TABLE CountryLanguage;
set histogram_size=255;
set histogram_type='DOUBLE_PREC_HB';
ANALYZE TABLE City;
--enable_result_log
--query_vertical select db_name,table_name,column_name,min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(histogram,hist_type) from mysql.column_stats where table_name='CountryLanguage' and column_name = 'Percentage';
--query_vertical select db_name,table_name,column_name,min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(histogram,hist_type) from mysql.column_stats where table_name='City' and column_name = 'Population';
set histogram_type=default;
set histogram_size=default;
use test;
DROP DATABASE world;

21
sql/item_create.cc
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@ -614,6 +614,19 @@ protected:
};
class Create_func_decode_histogram : public Create_func_arg2
{
public:
Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);
static Create_func_decode_histogram s_singleton;
protected:
Create_func_decode_histogram() {}
virtual ~Create_func_decode_histogram() {}
};
class Create_func_concat_ws : public Create_native_func
{
public:
@ -3231,6 +3244,13 @@ Create_func_concat::create_native(THD *thd, LEX_STRING name,
return new (thd->mem_root) Item_func_concat(*item_list);
}
Create_func_decode_histogram Create_func_decode_histogram::s_singleton;
Item *
Create_func_decode_histogram::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
return new (thd->mem_root) Item_func_decode_histogram(arg1, arg2);
}
Create_func_concat_ws Create_func_concat_ws::s_singleton;
@ -5377,6 +5397,7 @@ static Native_func_registry func_array[] =
{ { C_STRING_WITH_LEN("DAYOFYEAR") }, BUILDER(Create_func_dayofyear)},
{ { C_STRING_WITH_LEN("DECODE") }, BUILDER(Create_func_decode)},
{ { C_STRING_WITH_LEN("DEGREES") }, BUILDER(Create_func_degrees)},
{ { C_STRING_WITH_LEN("DECODE_HISTOGRAM") }, BUILDER(Create_func_decode_histogram)},
{ { C_STRING_WITH_LEN("DES_DECRYPT") }, BUILDER(Create_func_des_decrypt)},
{ { C_STRING_WITH_LEN("DES_ENCRYPT") }, BUILDER(Create_func_des_encrypt)},
{ { C_STRING_WITH_LEN("DIMENSION") }, GEOM_BUILDER(Create_func_dimension)},

77
sql/item_strfunc.cc
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@ -60,6 +60,7 @@ C_MODE_START
C_MODE_END
#include "sql_show.h" // append_identifier
#include <sql_repl.h>
#include "sql_statistics.h"
/**
@todo Remove this. It is not safe to use a shared String object.
@ -472,6 +473,82 @@ void Item_func_aes_decrypt::fix_length_and_dec()
set_persist_maybe_null(1);
}
///////////////////////////////////////////////////////////////////////////////
const char *histogram_types[] =
{"SINGLE_PREC_HB", "DOUBLE_PREC_HB", 0};
static TYPELIB hystorgam_types_typelib=
{ array_elements(histogram_types),
"histogram_types",
histogram_types, NULL};
const char *representation_by_type[]= {"%.3f", "%.5f"};
String *Item_func_decode_histogram::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
char buff[STRING_BUFFER_USUAL_SIZE];
String *res, tmp(buff, sizeof(buff), &my_charset_bin);
int type;
tmp.length(0);
if (!(res= args[1]->val_str(&tmp)) ||
(type= find_type(res->c_ptr_safe(),
&hystorgam_types_typelib, MYF(0))) <= 0)
{
null_value= 1;
return 0;
}
type--;
tmp.length(0);
if (!(res= args[0]->val_str(&tmp)))
{
null_value= 1;
return 0;
}
if (type == DOUBLE_PREC_HB && res->length() % 2 != 0)
res->length(res->length() - 1); // one byte is unused
double prev= 0.0;
uint i;
str->length(0);
bool first= true;
const uchar *p= (uchar*)res->c_ptr();
for (i= 0; i < res->length(); i++)
{
char numbuf[32];
double val;
switch (type)
{
case SINGLE_PREC_HB:
val= p[i] / ((double)((1 << 8) - 1));
break;
case DOUBLE_PREC_HB:
val= ((uint16 *)(p + i))[0] / ((double)((1 << 16) - 1));
i++;
break;
default:
val= 0;
DBUG_ASSERT(0);
}
/* show delta with previous value */
int size= my_snprintf(numbuf, sizeof(numbuf),
representation_by_type[type], val - prev);
if (first)
first= false;
else
str->append(",");
str->append(numbuf, size);
prev= val;
}
null_value=0;
return str;
}
///////////////////////////////////////////////////////////////////////////////
/**
Concatenate args with the following premises:

16
sql/item_strfunc.h
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@ -143,6 +143,22 @@ public:
const char *func_name() const { return "concat"; }
};
class Item_func_decode_histogram :public Item_str_func
{
String tmp_value;
public:
Item_func_decode_histogram(Item *a, Item *b)
:Item_str_func(a, b) {}
String *val_str(String *);
void fix_length_and_dec()
{
collation.set(system_charset_info);
max_length= MAX_BLOB_WIDTH;
set_persist_maybe_null(1);
}
const char *func_name() const { return "decode_histogram"; }
};
class Item_func_concat_ws :public Item_str_func
{
String tmp_value;

3
sql/sys_vars.cc
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@ -3970,8 +3970,7 @@ static Sys_var_ulong Sys_histogram_size(
SESSION_VAR(histogram_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 255), DEFAULT(0), BLOCK_SIZE(1));
const char *histogram_types[] =
{"SINGLE_PREC_HB", "DOUBLE_PREC_HB", 0};
extern const char *histogram_types[];
static Sys_var_enum Sys_histogram_type(
"histogram_type",
"Specifies type of the histograms created by ANALYZE. "