Clarify comment about temporal foreign keys

In RI_ConstraintInfo, period_contained_by_oper and
period_intersect_oper can take either anyrange or anymultirange.

Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Discussion: https://www.postgresql.org/message-id/CA%2BrenyWzDth%2BjqLZA2L2Cezs3wE%2BWX-5P8W2EOVx_zfFD%3Daicg%40mail.gmail.com

diff --git a/src/backend/utils/adt/ri_triggers.c b/src/backend/utils/adt/ri_triggers.c
index 059fc5ebf601accdc3846e0d095af5a2451ed7d0..d54591fce58c2104cab6f4126c91cb3c402156c4 100644 (file)
--- a/src/backend/utils/adt/ri_triggers.c
+++ b/src/backend/utils/adt/ri_triggers.c
@@ -126,9 +126,11 @@ typedef struct RI_ConstraintInfo
        Oid                     pf_eq_oprs[RI_MAX_NUMKEYS]; /* equality operators (PK = FK) */
        Oid                     pp_eq_oprs[RI_MAX_NUMKEYS]; /* equality operators (PK = PK) */
        Oid                     ff_eq_oprs[RI_MAX_NUMKEYS]; /* equality operators (FK = FK) */
-       Oid                     period_contained_by_oper;       /* anyrange <@ anyrange */
+       Oid                     period_contained_by_oper;       /* anyrange <@ anyrange (or
+                                                                                        * multiranges) */
        Oid                     agged_period_contained_by_oper; /* fkattr <@ range_agg(pkattr) */
-       Oid                     period_intersect_oper;  /* anyrange * anyrange */
+       Oid                     period_intersect_oper;  /* anyrange * anyrange (or
+                                                                                * multiranges) */
        dlist_node      valid_link;             /* Link in list of valid entries */
 } RI_ConstraintInfo;