row0sel.c:

 			}

		}

		/* If a constant search tuple is found directly from 

		the cluster index we lock only a record. 

		For example: WHERE a >= 100, where a is primary key */

		if(index == clust_index &&

				match_mode == ROW_SEL_OPEN_CURSOR &&

				mode == PAGE_CUR_GE &&

				dtuple_get_n_fields_cmp(search_tuple)

				== dict_index_get_n_unique(index) &&

				!cmp_dtuple_rec(search_tuple, rec, offsets)) {

		/* If we are doing a 'greater or equal than a primary key

		value' search from a clustered index, and we find a record

		that has that exact primary key value, then there is no need

		to lock the gap before the record, because no insert in the

		gap can be in our search range. That is, no phantom row can

		appear that way.

		An example: if col1 is the primary key, the search is WHERE

		col1 >= 100, and we find a record where col1 = 100, then no

		need to lock the gap before that record. */

		if (index == clust_index

		    && mode == PAGE_CUR_GE

		    && direction == 0

		    && dtuple_get_n_fields_cmp(search_tuple)

		       == dict_index_get_n_unique(index)

		    && 0 == cmp_dtuple_rec(search_tuple, rec, offsets)) {

			lock_type = LOCK_REC_NOT_GAP;

		}