diff options
Diffstat (limited to 'sql/sql_statistics.h')
| -rw-r--r-- | sql/sql_statistics.h | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/sql/sql_statistics.h b/sql/sql_statistics.h index 28d5cd46760..64322623ab3 100644 --- a/sql/sql_statistics.h +++ b/sql/sql_statistics.h @@ -345,12 +345,17 @@ private: public: Histogram histogram; + + uint32 no_values_provided_bitmap() + { + return + ((1 << (COLUMN_STAT_HISTOGRAM-COLUMN_STAT_COLUMN_NAME))-1) << + (COLUMN_STAT_COLUMN_NAME+1); + } void set_all_nulls() { - column_stat_nulls= - ((1 << (COLUMN_STAT_HISTOGRAM-COLUMN_STAT_COLUMN_NAME))-1) << - (COLUMN_STAT_COLUMN_NAME+1); + column_stat_nulls= no_values_provided_bitmap(); } void set_not_null(uint stat_field_no) @@ -396,8 +401,22 @@ public: bool min_max_values_are_provided() { return !is_null(COLUMN_STAT_MIN_VALUE) && - !is_null(COLUMN_STAT_MIN_VALUE); - } + !is_null(COLUMN_STAT_MAX_VALUE); + } + /* + This function checks whether the values for the fields of the statistical + tables that were NULL by DEFAULT for a column have changed or not. + + @retval + TRUE: Statistics are not present for a column + FALSE: Statisitics are present for a column + */ + bool no_stat_values_provided() + { + if (column_stat_nulls == no_values_provided_bitmap()) + return true; + return false; + } }; |