* Returns -1 if count cannot be found
* Takes same arguments as Database::select()
* @param string $table
- * @param string $vars
+ * @param string $var
* @param string $conds
* @param string $fname
* @param array $options
* @param array $join_conds
* @return int
*/
- public function estimateRowCount( $table, $vars = '*', $conds = '',
+ public function estimateRowCount( $table, $var = '*', $conds = '',
$fname = __METHOD__, $options = [], $join_conds = []
) {
+ $conds = $this->normalizeConditions( $conds, $fname );
+ $column = $this->extractSingleFieldFromList( $var );
+ if ( is_string( $column ) && !in_array( $column, [ '*', '1' ] ) ) {
+ $conds[] = "$column IS NOT NULL";
+ }
+
// http://msdn2.microsoft.com/en-us/library/aa259203.aspx
$options['EXPLAIN'] = true;
$options['FOR COUNT'] = true;
- $res = $this->select( $table, $vars, $conds, $fname, $options, $join_conds );
+ $res = $this->select( $table, $var, $conds, $fname, $options, $join_conds );
$rows = -1;
if ( $res ) {