improved sql parser.

src/main/java/com/alibaba/druid/sql/ast/SQLSubPartition.java

@@ -23,6 +23,8 @@ public class SQLSubPartition extends SQLObjectImpl {
 
     protected SQLPartitionValue values;
 
+    private SQLName             tableSpace;
+
     public SQLName getName() {
         return name;
     }
@@ -45,10 +47,22 @@ public class SQLSubPartition extends SQLObjectImpl {
         this.values = values;
     }
 
+    public SQLName getTableSpace() {
+        return tableSpace;
+    }
+
+    public void setTableSpace(SQLName tableSpace) {
+        if (tableSpace != null) {
+            tableSpace.setParent(this);
+        }
+        this.tableSpace = tableSpace;
+    }
+
     @Override
     protected void accept0(SQLASTVisitor visitor) {
         if (visitor.visit(this)) {
             acceptChild(visitor, name);
+            acceptChild(visitor, tableSpace);
             acceptChild(visitor, values);
         }
         visitor.endVisit(this);

src/main/java/com/alibaba/druid/sql/ast/expr/SQLIdentifierExpr.java

@@ -22,9 +22,9 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 public class SQLIdentifierExpr extends SQLExprImpl implements SQLName {
 
-    private String           name;
+    protected String          name;
 
-    private transient String lowerName;
+    private transient String  lowerName;
     private transient Boolean parameter;
 
     public SQLIdentifierExpr(){
@@ -132,4 +132,8 @@ public class SQLIdentifierExpr extends SQLExprImpl implements SQLName {
     public SQLIdentifierExpr clone() {
         return new SQLIdentifierExpr(this.name);
     }
+
+    public String normalizedName() {
+        return SQLUtils.normalize(name);
+    }
 }

src/main/java/com/alibaba/druid/sql/ast/expr/SQLPropertyExpr.java

@@ -15,6 +15,7 @@
  */
 package com.alibaba.druid.sql.ast.expr;
 
+import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLExprImpl;
 import com.alibaba.druid.sql.ast.SQLName;
@@ -138,4 +139,18 @@ public class SQLPropertyExpr extends SQLExprImpl implements SQLName {
 
         return false;
     }
+
+    public String normalizedName() {
+
+        String ownerName;
+        if (owner instanceof SQLIdentifierExpr) {
+            ownerName = ((SQLIdentifierExpr) owner).normalizedName();
+        } else if (owner instanceof SQLPropertyExpr) {
+            ownerName = ((SQLPropertyExpr) owner).normalizedName();
+        } else {
+            ownerName = owner.toString();
+        }
+
+        return ownerName + '.' + SQLUtils.normalize(name);
+    }
 }