support pgsql truncate statement

src/main/java/com/alibaba/druid/sql/ast/statement/SQLTruncateStatement.java

@@ -0,0 +1,29 @@
+package com.alibaba.druid.sql.ast.statement;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.SQLStatementImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLTruncateStatement extends SQLStatementImpl {
+
+    private static final long serialVersionUID = 1L;
+    protected List<SQLName>           tableNames = new ArrayList<SQLName>(2);
+
+    public List<SQLName> getTableNames() {
+        return tableNames;
+    }
+
+    public void setTableNames(List<SQLName> tableNames) {
+        this.tableNames = tableNames;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, tableNames);
+        }
+    }
+}