fixes #419

Author: wumpz

src/main/java/net/sf/jsqlparser/statement/drop/Drop.java

@@ -84,7 +84,7 @@ public String toString() {
         }
 
         if (parameters != null && !parameters.isEmpty()) {
-            sql += " " + PlainSelect.getStringList(parameters);
+            sql += " " + PlainSelect.getStringList(parameters, false, false);
         }
 
         return sql;

src/main/java/net/sf/jsqlparser/util/deparser/DropDeParser.java

@@ -33,7 +33,7 @@ public void deParse(Drop drop) {
         }
 
         if (drop.getParameters() != null && !drop.getParameters().isEmpty()) {
-            buffer.append(" ").append(PlainSelect.getStringList(drop.getParameters()));
+            buffer.append(" ").append(PlainSelect.getStringList(drop.getParameters(), false, false));
         }
     }
 

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -5698,7 +5698,7 @@ Drop Drop():
 
     name = Table() { drop.setName(name); }
     [ funcArgs = FuncArgsList() ]
-    ((tk=<S_IDENTIFIER> | tk=<K_CASCADE> | tk=<K_RESTRICT> ) { dropArgs.add(tk.image); })*
+    ((tk=<S_IDENTIFIER> | tk=<K_CASCADE> | tk=<K_RESTRICT> | tk=<K_ON>) { dropArgs.add(tk.image); })*
 
     {
         if (dropArgs.size() > 0) {

src/test/java/net/sf/jsqlparser/statement/drop/DropTest.java

@@ -46,6 +46,11 @@ public void testDropIndex() throws JSQLParserException {
         assertDeparse(created, statement);
         assertEqualsObjectTree(parsed, created);
     }
+    
+    @Test
+    public void testDropIndexOnTable() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("DROP INDEX idx ON abc");
+    }
 
     @Test
     public void testDrop2() throws JSQLParserException {

src/test/resources/net/sf/jsqlparser/statement/select/oracle-tests/interval05.sql

@@ -10,4 +10,5 @@
 -- see metalink note 1056382.1
 select 'yes' from dual where (sysdate-5,sysdate) overlaps (sysdate-2,sysdate-1)
 
---@FAILURE: Encountered unexpected token: "overlaps" <S_IDENTIFIER> recorded first on Aug 3, 2021, 7:20:08 AM
+--@FAILURE: Encountered unexpected token: "overlaps" <S_IDENTIFIER> recorded first on Aug 3, 2021, 7:20:08 AM
+--@SUCCESSFULLY_PARSED_AND_DEPARSED first on 31.08.2022 20:18:36