analytic clause

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@974 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java

@@ -133,19 +133,27 @@ public class OracleOutputVisitor extends SQLASTOutputVisitor implements OracleAS
     }
 
     public boolean visit(OracleAnalytic x) {
+        boolean space = false;
         if (x.getPartitionBy().size() > 0) {
             print("PARTITION BY (");
             printAndAccept(x.getPartitionBy(), ", ");
             print(")");
+
+            space = true;
         }
 
         if (x.getOrderBy() != null) {
-            print(" ");
+            if (space) {
+                print(" ");
+            }
             x.getOrderBy().accept(this);
+            space = true;
         }
 
         if (x.getWindowing() != null) {
-            print(" ");
+            if (space) {
+                print(" ");
+            }
             x.getWindowing().accept(this);
         }
 

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

@@ -0,0 +1,30 @@
+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 com.alibaba.druid.sql.test.TestUtils;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+public class OracleAnalyticTest extends TestCase {
+
+	public void test_isEmpty() throws Exception {
+		String sql = "SELECT last_name, salary, STDDEV(salary) OVER (ORDER BY hire_date) \"StdDev\" " +
+				"FROM employees " +
+				"WHERE department_id = 30;";
+
+		String expect = "SELECT last_name, salary, STDDEV(salary) OVER (ORDER BY hire_date) AS \"StdDev\"\n" +
+                "FROM employees\n" +
+                "WHERE department_id = 30;\n";
+		OracleStatementParser parser = new OracleStatementParser(sql);
+		SQLSelectStatement stmt = (SQLSelectStatement) parser
+				.parseStatementList().get(0);
+
+		String text = TestUtils.outputOracle(stmt);
+
+		Assert.assertEquals(expect, text);
+
+		System.out.println(text);
+	}
+}