Add Float8range

PostgreSQL doesn't define float8range out of the box though it can
easily be created by the user. However, it is still convenient to treat
a numrange as a float8range.

pgtype/range_codec_test.go

@@ -36,6 +36,33 @@ func TestRangeCodecTranscode(t *testing.T) {
 	})
 }
 
+func TestRangeCodecTranscodeCompatibleRangeElementTypes(t *testing.T) {
+	testutil.RunTranscodeTests(t, "numrange", []testutil.TranscodeTestCase{
+		{
+			pgtype.Float8range{LowerType: pgtype.Empty, UpperType: pgtype.Empty, Valid: true},
+			new(pgtype.Float8range),
+			isExpectedEq(pgtype.Float8range{LowerType: pgtype.Empty, UpperType: pgtype.Empty, Valid: true}),
+		},
+		{
+			pgtype.Float8range{
+				LowerType: pgtype.Inclusive,
+				Lower:     pgtype.Float8{Float: 1, Valid: true},
+				Upper:     pgtype.Float8{Float: 5, Valid: true},
+				UpperType: pgtype.Exclusive, Valid: true,
+			},
+			new(pgtype.Float8range),
+			isExpectedEq(pgtype.Float8range{
+				LowerType: pgtype.Inclusive,
+				Lower:     pgtype.Float8{Float: 1, Valid: true},
+				Upper:     pgtype.Float8{Float: 5, Valid: true},
+				UpperType: pgtype.Exclusive, Valid: true,
+			}),
+		},
+		{pgtype.Float8range{}, new(pgtype.Float8range), isExpectedEq(pgtype.Float8range{})},
+		{nil, new(pgtype.Float8range), isExpectedEq(pgtype.Float8range{})},
+	})
+}
+
 func TestRangeCodecDecodeValue(t *testing.T) {
 	conn := testutil.MustConnectPgx(t)
 	defer testutil.MustCloseContext(t, conn)

pgtype/range_types.go

@@ -216,3 +216,39 @@ func (r *Daterange) SetBoundTypes(lower, upper BoundType) error {
 	r.Valid = true
 	return nil
 }
+
+type Float8range struct {
+	Lower     Float8
+	Upper     Float8
+	LowerType BoundType
+	UpperType BoundType
+	Valid     bool
+}
+
+func (r Float8range) IsNull() bool {
+	return !r.Valid
+}
+
+func (r Float8range) BoundTypes() (lower, upper BoundType) {
+	return r.LowerType, r.UpperType
+}
+
+func (r Float8range) Bounds() (lower, upper interface{}) {
+	return &r.Lower, &r.Upper
+}
+
+func (r *Float8range) ScanNull() error {
+	*r = Float8range{}
+	return nil
+}
+
+func (r *Float8range) ScanBounds() (lowerTarget, upperTarget interface{}) {
+	return &r.Lower, &r.Upper
+}
+
+func (r *Float8range) SetBoundTypes(lower, upper BoundType) error {
+	r.LowerType = lower
+	r.UpperType = upper
+	r.Valid = true
+	return nil
+}

pgtype/range_types.go.erb

@@ -7,7 +7,8 @@ package pgtype
     ["Numrange", "Numeric"],
     ["Tsrange", "Timestamp"],
     ["Tstzrange", "Timestamptz"],
-    ["Daterange", "Date"]
+    ["Daterange", "Date"],
+    ["Float8range", "Float8"]
   ].each do |range_type, element_type|
 %>
 type <%= range_type %> struct {