chore: Support text/varchar type in JDBC

Author: sakthivelmanii

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

@@ -297,6 +297,32 @@ public Type getSpannerType() {
       return Type.string();
     }
   },
+  TEXT {
+    @Override
+    public int getSqlType() {
+      return Types.NVARCHAR;
+    }
+
+    @Override
+    public Class<String> getJavaClass() {
+      return String.class;
+    }
+
+    @Override
+    public Code getCode() {
+      return Code.STRING;
+    }
+
+    @Override
+    public List<String> getArrayElements(ResultSet rs, int columnIndex) {
+      return rs.getStringList(columnIndex);
+    }
+
+    @Override
+    public Type getSpannerType() {
+      return Type.string();
+    }
+  },
   JSON {
     @Override
     public int getSqlType() {

src/main/resources/com/google/cloud/spanner/jdbc/postgresql/DatabaseMetaData_GetColumns.sql

@@ -28,7 +28,10 @@ SELECT TABLE_CATALOG AS "TABLE_CAT", TABLE_SCHEMA AS "TABLE_SCHEM", TABLE_NAME A
            WHEN DATA_TYPE = 'jsonb' THEN -9
            WHEN DATA_TYPE = 'timestamp with time zone' THEN 93
            END AS "DATA_TYPE",
-       DATA_TYPE AS "TYPE_NAME",
+       CASE
+           WHEN spanner_type LIKE 'character varying[]' then '_varchar'
+           ELSE DATA_TYPE
+           END AS "TYPE_NAME",
        CASE
            WHEN DATA_TYPE LIKE 'ARRAY' THEN 0
            WHEN DATA_TYPE = 'boolean' THEN NULL