improved sql parser for postgresql

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

@@ -16,6 +16,7 @@
 
 package com.alibaba.druid.sql.ast.statement;
 
+import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLObjectImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
@@ -23,10 +24,19 @@ public class SQLAlterTableAlterColumn extends SQLObjectImpl implements SQLAlterT
 
     private SQLColumnDefinition column;
 
+    private boolean             setNotNull;
+
+    private boolean             dropNotNull;
+
+    private SQLExpr             setDefault;
+
+    private boolean             dropDefault;
+
     @Override
     protected void accept0(SQLASTVisitor visitor) {
         if (visitor.visit(this)) {
             acceptChild(visitor, column);
+            acceptChild(visitor, setDefault);
         }
         visitor.endVisit(this);
     }
@@ -39,4 +49,36 @@ public class SQLAlterTableAlterColumn extends SQLObjectImpl implements SQLAlterT
         this.column = column;
     }
 
+    public boolean isSetNotNull() {
+        return setNotNull;
+    }
+
+    public void setSetNotNull(boolean setNotNull) {
+        this.setNotNull = setNotNull;
+    }
+
+    public boolean isDropNotNull() {
+        return dropNotNull;
+    }
+
+    public void setDropNotNull(boolean dropNotNull) {
+        this.dropNotNull = dropNotNull;
+    }
+
+    public SQLExpr getSetDefault() {
+        return setDefault;
+    }
+
+    public void setSetDefault(SQLExpr setDefault) {
+        this.setDefault = setDefault;
+    }
+
+    public boolean isDropDefault() {
+        return dropDefault;
+    }
+
+    public void setDropDefault(boolean dropDefault) {
+        this.dropDefault = dropDefault;
+    }
+
 }

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

@@ -26,6 +26,8 @@ public class SQLAlterTableDropColumnItem extends SQLObjectImpl implements SQLAlt
 
     private List<SQLName> columns = new ArrayList<SQLName>();
 
+    private boolean       cascade = false;
+
     public SQLAlterTableDropColumnItem(){
 
     }
@@ -42,4 +44,12 @@ public class SQLAlterTableDropColumnItem extends SQLObjectImpl implements SQLAlt
         return columns;
     }
 
+    public boolean isCascade() {
+        return cascade;
+    }
+
+    public void setCascade(boolean cascade) {
+        this.cascade = cascade;
+    }
+
 }

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

@@ -0,0 +1,28 @@
+package com.alibaba.druid.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterTableRename extends SQLObjectImpl implements SQLAlterTableItem {
+
+    protected SQLExpr to;
+
+    public SQLExpr getTo() {
+        return to;
+    }
+
+    public void setTo(SQLExpr to) {
+        this.to = to;
+        to.setParent(this);
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, to);
+        }
+        visitor.endVisit(this);
+    }
+
+}