From 3294a8cf1f2701b7bcc229597e7e4081b5d49532 Mon Sep 17 00:00:00 2001
From: Jack Christensen <jack@jackchristensen.com>
Date: Mon, 20 May 2019 16:26:58 -0500
Subject: [PATCH] Allow empty hstore keys

See pgx commit: 56f4f0b9d319a910016ce044a53f52fcf986ddc6
---
 hstore.go      | 10 +++-------
 hstore_test.go |  1 +
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/hstore.go b/hstore.go
index 522813ff..56af38ee 100644
--- a/hstore.go
+++ b/hstore.go
@@ -297,13 +297,9 @@ func parseHstore(s string) (k []string, v []Text, err error) {
 		case hsKey:
 			switch r {
 			case '"': //End of the key
-				if buf.Len() == 0 {
-					err = errors.New("Empty Key is invalid")
-				} else {
-					keys = append(keys, buf.String())
-					buf = bytes.Buffer{}
-					state = hsSep
-				}
+				keys = append(keys, buf.String())
+				buf = bytes.Buffer{}
+				state = hsSep
 			case '\\': //Potential escaped character
 				n, end := p.Consume()
 				switch {
diff --git a/hstore_test.go b/hstore_test.go
index ccd476dc..ba6c9373 100644
--- a/hstore_test.go
+++ b/hstore_test.go
@@ -19,6 +19,7 @@ func TestHstoreTranscode(t *testing.T) {
 		&pgtype.Hstore{Map: map[string]pgtype.Text{"foo": text("bar"), "baz": text("quz")}, Status: pgtype.Present},
 		&pgtype.Hstore{Map: map[string]pgtype.Text{"NULL": text("bar")}, Status: pgtype.Present},
 		&pgtype.Hstore{Map: map[string]pgtype.Text{"foo": text("NULL")}, Status: pgtype.Present},
+		&pgtype.Hstore{Map: map[string]pgtype.Text{"": text("bar")}, Status: pgtype.Present},
 		&pgtype.Hstore{Status: pgtype.Null},
 	}