* develop-olympus:
[ticket/10653] Call get_row_count of base class in mysql get_estimated_row_count
[ticket/9813] Only get posts table row count if we detected a fulltext index.
[ticket/9813] Also use estimated row count of posts table for fulltext mysql.
[ticket/10653] Fix parameter to substr() in unit tests. Should be 1, not -1.
[ticket/10653] Unit tests for get_row_count() and get_estimated_row_count().
[ticket/10653] Add ability to count table rows to database abstraction layer.
[ticket/9813] Use table status row count only if greater than 100000 or exact.
[ticket/9813] Use SHOW TABLE STATUS to get search stats for native on MySQL.