fix SQL SERVER ALTER TABLE ADD COLUMN BUG.

core/src/main/java/com/alibaba/druid/sql/parser/SQLStatementParser.java

@@ -2494,6 +2494,9 @@ public class SQLStatementParser extends SQLParser {
             SQLConstraint constraint = this.exprParser.parseConstaint();
             SQLAlterTableAddConstraint item = new SQLAlterTableAddConstraint(constraint);
             stmt.addItem(item);
+        } else if (lexer.token == LITERAL_ALIAS && dbType == DbType.sqlserver) {
+            SQLAlterTableAddColumn item = parseAlterTableAddColumn();
+            stmt.addItem(item);
         } else {
             throw new ParserException("TODO " + lexer.info());
         }

core/src/test/java/com/alibaba/druid/sql/parser/SqlserverAlterTest.java

@@ -0,0 +1,33 @@
+package com.alibaba.druid.sql.parser;
+
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
+import com.alibaba.druid.sql.dialect.sqlserver.parser.SQLServerStatementParser;
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+/**
+ * Created by zyc@byshell.org on 2016/8/16.
+ */
+public class SqlserverAlterTest extends TestCase {
+    public void testAlter1() {
+        String sql = "alter table alert_config_detail\n" + "    add age14 int";
+        SQLStatementParser parser = new SQLServerStatementParser(sql);
+        SQLAlterTableStatement stmt = (SQLAlterTableStatement) parser.parseStatement(); //
+        try {
+            stmt.toString();
+        } catch (ClassCastException e) {
+            Assert.fail(e.getMessage());
+        }
+    }
+
+    public void testAlter2() {
+        String sql = "ALTER TABLE \"console\".\"dbo\".\"alert_config_detail\"\n" + "\tADD \"age14\" int";
+        SQLStatementParser parser = new SQLServerStatementParser(sql);
+        SQLAlterTableStatement stmt = (SQLAlterTableStatement) parser.parseStatement(); //
+        try {
+            stmt.toString();
+        } catch (ClassCastException e) {
+            Assert.fail(e.getMessage());
+        }
+    }
+}