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Code cleanups part #3

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This commit is contained in:
Sergei Petrunia 2021-08-31 14:17:33 +03:00
parent 859c14ff01
commit 899dfb078e
2 changed files with 12 additions and 13 deletions
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12
sql/sql_statistics.cc
View file

@ -1967,7 +1967,7 @@ public:
class Histogram_builder
{
public:
protected:
Field *column; /* table field for which the histogram is built */
uint col_length; /* size of this field */
ha_rows records; /* number of records the histogram is built for */
@ -1982,6 +1982,7 @@ public:
/* number of distinct values that occured only once */
ulonglong count_distinct_single_occurence;
public:
Histogram_builder(Field *col, uint col_len, ha_rows rows)
: column(col), col_length(col_len), records(rows)
{
@ -2934,7 +2935,8 @@ bool Column_statistics_collected::add()
*/
inline
void Column_statistics_collected::finish(MEM_ROOT *mem_root, ha_rows rows, double sample_fraction)
void Column_statistics_collected::finish(MEM_ROOT *mem_root, ha_rows rows,
double sample_fraction)
{
double val;
@ -3486,7 +3488,7 @@ int read_statistics_for_table(THD *thd, TABLE *table, TABLE_LIST *stat_tables)
if (table_field->read_stats->histogram_type_on_disk != INVALID_HISTOGRAM)
have_histograms= true;
}
table_share->stats_cb.total_hist_size= have_histograms? 1:0; // total_hist_size
table_share->stats_cb.have_histograms= have_histograms;
/* Read statistics from the statistical table index_stats */
stat_table= stat_tables[INDEX_STAT].table;
@ -3626,7 +3628,7 @@ int read_histograms_for_table(THD *thd, TABLE *table, TABLE_LIST *stat_tables)
{
TABLE_STATISTICS_CB *stats_cb= &table->s->stats_cb;
DBUG_ENTER("read_histograms_for_table");
if (stats_cb->start_histograms_load())
{
Column_stat column_stat(stat_tables[COLUMN_STAT].table, table);
@ -4547,7 +4549,7 @@ double Histogram_binary::range_selectivity(Field *field,
}
/*
Check whether the table is one of the persistent statistical tables.
Check whether the table is one of the persistent statistical tables.
*/
bool is_stat_table(const LEX_CSTRING *db, LEX_CSTRING *table)
{

13
sql/table.h
View file

@ -681,22 +681,19 @@ public:
Table_statistics *table_stats; /* Structure to access the statistical data */
/*
Total size of all histograms. A value of 0 means historams are not present,
and histograms_are_ready() can finish sooner.
Currently we just set it to 1 when we expect to load histograms.
histogram-todo: rename this or even remove?
Whether the table has histograms.
(If the table has none, histograms_are_ready() can finish sooner)
*/
ulong total_hist_size;
bool have_histograms;
bool histograms_are_ready() const
{
return !total_hist_size || hist_state.is_ready();
return !have_histograms || hist_state.is_ready();
}
bool start_histograms_load()
{
return total_hist_size && hist_state.start_load();
return have_histograms && hist_state.start_load();
}
void end_histograms_load() { hist_state.end_load(); }