添加OracleExpr接口

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@950 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleIsASetTest.java

@@ -0,0 +1,24 @@
+package com.alibaba.druid.bvt.sql.oracle;
+
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+public class OracleIsASetTest extends TestCase {
+
+    public void test_is_a_set() throws Exception {
+        String sql = "SELECT customer_id, cust_address_ntab FROM customers_demo WHERE cust_address_ntab IS A SET;";
+
+        OracleStatementParser parser = new OracleStatementParser(sql);
+        SQLSelectStatement stmt = (SQLSelectStatement) parser.parseStatementList().get(0);
+
+        String text = TestUtils.output(stmt);
+
+        Assert.assertEquals("SELECT customer_id, cust_address_ntab\n" + "FROM customers_demo\n"
+                            + "WHERE cust_address_ntab IS A SET;\n", text);
+
+        System.out.println(text);
+    }
+}