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Code cleanup + reduce the diff size

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This commit is contained in:
Sergei Petrunia 2021-08-31 00:53:09 +03:00
parent 229c836d6a
commit 3486bf4110
2 changed files with 27 additions and 37 deletions
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20
sql/sql_statistics.cc
View File

@ -3620,16 +3620,6 @@ int read_histograms_for_table(THD *thd, TABLE *table, TABLE_LIST *stat_tables)
if (stats_cb->start_histograms_load())
{
//uchar *histogram= (uchar *) alloc_root(&stats_cb->mem_root,
// stats_cb->total_hist_size);
/*
if (!histogram)
{
stats_cb->abort_histograms_load();
DBUG_RETURN(1);
}
*/
Column_stat column_stat(stat_tables[COLUMN_STAT].table, table);
for (Field **field_ptr= table->s->field; *field_ptr; field_ptr++)
{
@ -4393,10 +4383,9 @@ double get_column_range_cardinality(Field *field,
/*
Estimate selectivity of "col=const" using a histogram
@param field - the field to estimate its selectivity.
@param field the field to estimate its selectivity.
@param min_endp, max_endp - Specifies the left and right bounds. For point selectivity,
they are both equal.
@param endpoint The constant
@param avg_sel Average selectivity of condition "col=const" in this table.
It is calcuated as (#non_null_values / #distinct_values).
@ -4426,11 +4415,12 @@ double get_column_range_cardinality(Field *field,
value.
*/
double Histogram_binary::point_selectivity(Field *field, key_range *min_endp, double avg_sel)
double Histogram_binary::point_selectivity(Field *field, key_range *endpoint,
double avg_sel)
{
double sel;
Column_statistics *col_stats= field->read_stats;
store_key_image_to_rec(field, (uchar *) min_endp->key,
store_key_image_to_rec(field, (uchar *) endpoint->key,
field->key_length());
double pos= field->pos_in_interval(col_stats->min_value,
col_stats->max_value);

44
sql/sql_statistics.h
View File

@ -195,26 +195,6 @@ private:
class Histogram_binary : public Histogram_base
{
public:
bool parse(MEM_ROOT *mem_root, Field *, Histogram_type type_arg,
const char *hist_data, size_t hist_data_len) override;
void serialize(Field *to_field) override;
Histogram_type get_type() override { return type; }
uint get_width() override
{
switch (type) {
case SINGLE_PREC_HB:
return size;
case DOUBLE_PREC_HB:
return size / 2;
default:
DBUG_ASSERT(0);
}
return 0;
}
private:
Histogram_type type;
uint8 size; /* Size of values array, in bytes */
@ -233,6 +213,20 @@ private:
return 1;
}
public:
uint get_width() override
{
switch (type) {
case SINGLE_PREC_HB:
return size;
case DOUBLE_PREC_HB:
return size / 2;
default:
DBUG_ASSERT(0);
}
return 0;
}
private:
uint get_value(uint i)
{
DBUG_ASSERT(i < get_width());
@ -287,10 +281,16 @@ private:
}
public:
void init_for_collection(MEM_ROOT *mem_root, Histogram_type htype_arg, ulonglong size) override;
uint get_size() override {return (uint)size;}
Histogram_type get_type() override { return type; }
bool parse(MEM_ROOT *mem_root, Field *, Histogram_type type_arg,
const char *hist_data, size_t hist_data_len) override;
void serialize(Field *to_field) override;
void init_for_collection(MEM_ROOT *mem_root, Histogram_type htype_arg,
ulonglong size) override;
bool is_available() override { return (values!=NULL); }
/*