*/
public function unionQueries( $sqls, $all );
+ /**
+ * Construct a UNION query for permutations of conditions
+ *
+ * Databases sometimes have trouble with queries that have multiple values
+ * for multiple condition parameters combined with limits and ordering.
+ * This method constructs queries for the Cartesian product of the
+ * conditions and unions them all together.
+ *
+ * @see IDatabase::select()
+ * @since 1.30
+ * @param string|array $table Table name
+ * @param string|array $vars Field names
+ * @param array $permute_conds Conditions for the Cartesian product. Keys
+ * are field names, values are arrays of the possible values for that
+ * field.
+ * @param string|array $extra_conds Additional conditions to include in the
+ * query.
+ * @param string $fname Caller function name
+ * @param string|array $options Query options. In addition to the options
+ * recognized by IDatabase::select(), the following may be used:
+ * - NOTALL: Set to use UNION instead of UNION ALL.
+ * - INNER ORDER BY: If specified and supported, subqueries will use this
+ * instead of ORDER BY.
+ * @param string|array $join_conds Join conditions
+ * @return string SQL query string.
+ */
+ public function unionConditionPermutations(
+ $table, $vars, array $permute_conds, $extra_conds = '', $fname = __METHOD__,
+ $options = [], $join_conds = []
+ );
+
/**
* Returns an SQL expression for a simple conditional. This doesn't need
* to be overridden unless CASE isn't supported in your DBMS.