spanner: Make a new release v1.1.0.

Change-Id: I188a387f7830a1dc438f0b7074d625b360fcea43
Reviewed-by: kokoro <>
Reviewed-by: Shanika Kuruppu <>
Reviewed-by: Knut Olav Løite <>
Reviewed-by: Jean de Klerk <>
diff --git a/internal/version/version.go b/internal/version/version.go
index a8c0bf9..2a25319 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -26,7 +26,7 @@
 // Repo is the current version of the client libraries in this
 // repo. It should be a date in YYYYMMDD format.
-const Repo = "20191029"
+const Repo = "20191104"
 // Go returns the Go runtime version. The returned string
 // has no whitespace.
diff --git a/spanner/ b/spanner/
index f92801b..19cee29 100644
--- a/spanner/
+++ b/spanner/
@@ -1,6 +1,27 @@
 # Changes
+## v1.1.0
+- The String() method of NullString, NullTime and NullDate will now return
+  an unquoted string instead of a quoted string. This is a BREAKING CHANGE.
+  If you relied on the old behavior, please use fmt.Sprintf("%q", T).
+- The Spanner client will now use the new BatchCreateSessions RPC to initialize
+  the session pool. This will improve the startup time of clients that are
+  initialized with a minimum number of sessions greater than zero
+  (i.e. SessionPoolConfig.MinOpened>0).
+- Spanner clients that are created with the NewClient method will now default
+  to a minimum of 100 opened sessions in the pool
+  (i.e. SessionPoolConfig.MinOpened=100). This will improve the performance
+  of the first transaction/query that is executed by an application, as a
+  session will normally not have to be created as part of the transaction.
+  Spanner clients that are created with the NewClientWithConfig method are
+  not affected by this change.
+- The session pool maintenance worker has been improved so it keeps better
+  track of the actual number of sessions needed. It will now less often delete
+  and re-create sessions. This can improve the overall performance of
+  applications with a low transaction rate.
 ## v1.0.0
 This is the first tag to carve out spanner as its own module. See:
\ No newline at end of file