Support DROP MATERIALIZED VIEW statements

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

@@ -28,6 +28,7 @@ public class Drop implements Statement {
     private List<String> parameters;
     private Map<String, List<String>> typeToParameters = new HashMap<>();
     private boolean ifExists = false;
+    private boolean materialized = false;
 
     @Override
     public void accept(StatementVisitor statementVisitor) {
@@ -66,6 +67,14 @@ public void setIfExists(boolean ifExists) {
         this.ifExists = ifExists;
     }
 
+    public boolean isMaterialized() {
+        return materialized;
+    }
+
+    public void setMaterialized(boolean materialized) {
+        this.materialized = materialized;
+    }
+
     public Map<String, List<String>> getTypeToParameters() {
         return typeToParameters;
     }
@@ -76,7 +85,9 @@ public void setTypeToParameters(Map<String, List<String>> typeToParameters) {
 
     @Override
     public String toString() {
-        String sql = "DROP " + type + " "
+        String sql = "DROP " 
+                + (materialized ? "MATERIALIZED " : "")
+                + type + " "
                 + (ifExists ? "IF EXISTS " : "") + name.toString();
 
         if (type.equals("FUNCTION")) {
@@ -106,6 +117,11 @@ public Drop withIfExists(boolean ifExists) {
         return this;
     }
 
+    public Drop withMaterialized(boolean materialized) {
+        this.setMaterialized(materialized);
+        return this;
+    }
+
     public Drop withType(String type) {
         this.setType(type);
         return this;

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

@@ -21,6 +21,9 @@ public DropDeParser(StringBuilder buffer) {
     @Override
     public void deParse(Drop drop) {
         buffer.append("DROP ");
+        if (drop.isMaterialized()) {
+            buffer.append("MATERIALIZED ");
+        }
         buffer.append(drop.getType());
         if (drop.isIfExists()) {
             buffer.append(" IF EXISTS");

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

@@ -5698,6 +5698,7 @@ Drop Drop():
 }
 {
     <K_DROP>
+    [ <K_MATERIALIZED> { drop.setMaterialized(true);} ]
     (
         tk=<S_IDENTIFIER>
         |

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

@@ -87,6 +87,11 @@ public void testDropViewIssue545_2() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("DROP VIEW IF EXISTS myview");
     }
 
+    @Test
+    public void testDropMaterializedView() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("DROP MATERIALIZED VIEW myview");
+    }
+
     @Test
     public void testDropSchemaIssue855() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("DROP SCHEMA myschema");