improved postgresql parser, fix #4221

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -1584,6 +1584,9 @@ public class SQLExprParser extends SQLParser {
                 aggregateExpr.setOption(SQLAggregateOption.DISTINCT);
             }
 
+            if (lexer.token == Token.COLONCOLON) {
+                return primaryRest(aggregateExpr);
+            }
 
             return aggregateExpr;
         }

src/test/java/com/alibaba/druid/bvt/sql/postgresql/PostgresqlResourceTest.java

@@ -80,6 +80,10 @@ public class PostgresqlResourceTest extends PGTest {
         exec_test("bvt/parser/postgresql-10.txt");
     }
 
+    public void test_11() throws Exception {
+        exec_test("bvt/parser/postgresql-11.txt");
+    }
+
     public void exec_test(String resource) throws Exception {
         System.out.println(resource);
         InputStream is = null;

src/test/resources/bvt/parser/postgresql-11.txt

@@ -0,0 +1,4 @@
+select v_date_desc::date - max(access_time)::date from table1;
+---------------------------
+SELECT v_date_desc::date - max(access_time)::date
+FROM table1;