PostgreSQL: lp_flags format

format/postgres/common/pgheap.go

@@ -6,6 +6,11 @@ import (
 
 const (
 	HeapPageSize = 8192
+
+	LP_UNUSED   = 0 /* unused (should always have lp_len=0) */
+	LP_NORMAL   = 1 /* used (should always have lp_len>0) */
+	LP_REDIRECT = 2 /* HOT redirect (should have lp_len=0) */
+	LP_DEAD     = 3
 )
 
 type lpOffMapper struct{}
@@ -23,6 +28,16 @@ type lpFlagsMapper struct{}
 func (m lpFlagsMapper) MapScalar(s scalar.S) (scalar.S, error) {
 	v := (s.ActualU() >> 15) & 0x3
 	s.Actual = v
+	switch v {
+	case LP_UNUSED:
+		s.Sym = "LP_UNUSED"
+	case LP_NORMAL:
+		s.Sym = "LP_NORMAL"
+	case LP_REDIRECT:
+		s.Sym = "LP_REDIRECT"
+	case LP_DEAD:
+		s.Sym = "LP_DEAD"
+	}
 	return s, nil
 }