Merge branch 'main' into PR #2191 to update

Author: lqiu96

.github/release-please.yml

@@ -2,13 +2,7 @@ releaseType: java-yoshi
 bumpMinorPreMajor: true
 handleGHRelease: true
 branches:
-- branch: 1.21.x
-  releaseType: java-yoshi
-  bumpMinorPreMajor: true
-  handleGHRelease: true
-- branch: protobuf-4.x-rc
-  releaseType: java-yoshi
-  bumpMinorPreMajor: true
-  handleGHRelease: true
-  manifest: true
+    - branch: 1.21.x
+    - branch: protobuf-4.x-rc
+      manifest: true
 extraFiles: ["README.md"]

src/main/java/com/google/cloud/spanner/jdbc/JdbcDataType.java

@@ -113,6 +113,8 @@ public Type getSpannerType() {
     }
   },
   FLOAT32 {
+    private final Set<String> aliases = new HashSet<>(Collections.singletonList("float4"));
+
     @Override
     public int getSqlType() {
       return Types.REAL;
@@ -152,6 +154,11 @@ public List<Float> getArrayElements(ResultSet rs, int columnIndex) {
     public Type getSpannerType() {
       return Type.float32();
     }
+
+    @Override
+    public Set<String> getPostgreSQLAliases() {
+      return aliases;
+    }
   },
   FLOAT64 {
     private final Set<Class<?>> classes = new HashSet<>(Arrays.asList(Float.class, Double.class));