pg sql parser support interval <int>

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGExprParser.java

@@ -156,7 +156,7 @@ public class PGExprParser extends SQLExprParser {
     protected SQLExpr parseInterval() {
         accept(Token.INTERVAL);
         SQLIntervalExpr intervalExpr = new SQLIntervalExpr();
-        if (lexer.token() != Token.LITERAL_CHARS) {
+        if (lexer.token() != Token.LITERAL_CHARS && lexer.token() != Token.LITERAL_INT) {
             return new SQLIdentifierExpr("INTERVAL");
         }
         intervalExpr.setValue(new SQLCharExpr(lexer.stringVal()));

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGLexer.java

@@ -71,6 +71,7 @@ public class PGLexer extends Lexer {
         map.put("MERGE", Token.MERGE);
         map.put("MATCHED", Token.MATCHED);
         map.put("PARTITION", Token.PARTITION);
+        map.put("INTERVAL", Token.INTERVAL);
 
         DEFAULT_PG_KEYWORDS = new Keywords(map);
     }

src/test/java/com/alibaba/druid/bvt/sql/postgresql/select/PGSelectTest86.java

@@ -37,13 +37,15 @@ public class PGSelectTest86
         assertEquals(1, statements.size());
         final SQLStatement stmt = statements.get(0);
 
-        assertEquals("SELECT *\n" +
-                        "FROM xxx_point point\n" +
-                        "\tINNER JOIN xxx_cc cc ON point.id = cc.point_id"
+        assertEquals("SELECT COUNT(1) AS res\n" +
+                        "FROM TB_EXPERIENCE exp\n" +
+                        "WHERE exp.creatdate > DATE_SUB(CURDATE(), INTERVAL '1' MONTH)\n" +
+                        "\tAND exp.cstatus = 1"
                 , stmt.toString());
 
-        assertEquals("select *\n" +
-                "from xxx_point point\n" +
-                "\tinner join xxx_cc cc on point.id = cc.point_id", stmt.toLowerCaseString());
+        assertEquals("select count(1) as res\n" +
+                "from TB_EXPERIENCE exp\n" +
+                "where exp.creatdate > DATE_SUB(CURDATE(), interval '1' month)\n" +
+                "\tand exp.cstatus = 1", stmt.toLowerCaseString());
     }
 }