[bug](function)fix date_floor function return wrong result #41948
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) ``` void resize_fill(size_t n, const T& value) { size_t old_size = this->size(); if (n > old_size) { this->reserve(n); std::fill(t_end(), t_end() + n - old_size, value); } this->c_end = this->c_start + this->byte_size(n); } ``` if n is not greater than old_size, it's will not fill the data with value. so it's not set the null_map flag to 1, it's can't return NULL ``` mysql [test_query_qa]>select k11,hour_floor(k11,0) from baseall where k1 = 6; +---------------------+--------------------+ | k11 | hour_floor(k11, 0) | +---------------------+--------------------+ | 2015-03-13 12:36:38 | | +---------------------+--------------------+ 1 row in set (0.03 se ``` after fix: ``` mysql [test_query_qa]>select k11,hour_floor(k11,0) from baseall where k1 = 6; +---------------------+--------------------+ | k11 | hour_floor(k11, 0) | +---------------------+--------------------+ | 2015-03-13 12:36:38 | NULL | +---------------------+--------------------+ 1 row in set (0.03 sec) ```
) ``` void resize_fill(size_t n, const T& value) { size_t old_size = this->size(); if (n > old_size) { this->reserve(n); std::fill(t_end(), t_end() + n - old_size, value); } this->c_end = this->c_start + this->byte_size(n); } ``` if n is not greater than old_size, it's will not fill the data with value. so it's not set the null_map flag to 1, it's can't return NULL ``` mysql [test_query_qa]>select k11,hour_floor(k11,0) from baseall where k1 = 6; +---------------------+--------------------+ | k11 | hour_floor(k11, 0) | +---------------------+--------------------+ | 2015-03-13 12:36:38 | | +---------------------+--------------------+ 1 row in set (0.03 se ``` after fix: ``` mysql [test_query_qa]>select k11,hour_floor(k11,0) from baseall where k1 = 6; +---------------------+--------------------+ | k11 | hour_floor(k11, 0) | +---------------------+--------------------+ | 2015-03-13 12:36:38 | NULL | +---------------------+--------------------+ 1 row in set (0.03 sec) ```
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Proposed changes
if n is not greater than old_size,
it's will not fill the data with value.
so it's not set the null_map flag to 1, it's can't return NULL
after fix: