subquery factoring

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@981 b9813039-fb51-4c41-a8b9-e21c2acb5095
2023-03-04 19:17:16 +00:00 · 2011-10-15 10:09:13 +00:00
parent f4f61768c3
commit 10ad8df014
2 changed files with 60 additions and 1 deletions
@@ -0,0 +1,59 @@
+package com.alibaba.druid.bvt.sql.oracle;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
+import com.alibaba.druid.sql.test.TestUtils;
+
+public class OracleSubqueryFactoringTest2 extends TestCase {
+
+    public void test_interval() throws Exception {
+        String sql = "WITH org_chart (eid, emp_last, mgr_id, reportLevel, salary, job_id) AS\n" +
+        		"(\n" +
+        		"SELECT employee_id, last_name, manager_id, 0 reportLevel, salary, job_id\n" +
+        		"FROM employees\n" +
+        		"WHERE manager_id is null\n" +
+        		"UNION ALL\n" +
+        		"SELECT e.employee_id, e.last_name, e.manager_id, r.reportLevel+1 reportLevel, e.salary, e.job_id\n" +
+        		"FROM org_chart r, employees e\n" +
+        		"WHERE r.eid = e.manager_id\n" +
+        		")\n" +
+        		"SEARCH DEPTH FIRST BY emp_last SET order1\n" +
+        		"CYCLE hire_date SET is_cycle TO 'Y' DEFAULT 'N'" +
+        		"SELECT lpad(' ',2*reportLevel)||emp_last emp_name, eid, mgr_id, salary, job_id\n" +
+        		"FROM org_chart\n" +
+        		"ORDER BY order1;\n";
+
+        String expected = "WITH\n" +
+        		"\torg_chart (eid, emp_last, mgr_id, reportLevel, salary, job_id)\n" +
+        		"\tAS\n" +
+                "\t(\n" +
+                "\t\tSELECT employee_id, last_name, manager_id, 0 AS reportLevel, salary\n" +
+                "\t\t\t, job_id\n" +
+                "\t\tFROM employees\n" +
+                "\t\tWHERE manager_id IS NULL\n" +
+                "\t\tUNION ALL\n" +
+                "\t\tSELECT e.employee_id, e.last_name, e.manager_id, r.reportLevel + 1 AS reportLevel, e.salary\n" +
+                "\t\t\t, e.job_id\n" +
+                "\t\tFROM org_chart r, employees e\n" +
+                "\t\tWHERE r.eid = e.manager_id\n" +
+                "\t)\n" +
+                "\tSEARCH DEPTH FIRST BY emp_last SET order1\n" +
+                "\tCYCLE hire_date SET is_cycle TO 'Y' DEFAULT 'N'\n" +
+                "SELECT lpad(' ', 2 * reportLevel) || emp_last AS emp_name, eid, mgr_id, salary, job_id\n" +
+                "FROM org_chart\n" +
+                "ORDER BY order1;\n";
+
+        OracleStatementParser parser = new OracleStatementParser(sql);
+        SQLSelectStatement stmt = (SQLSelectStatement) parser.parseStatementList().get(0);
+
+        String text = TestUtils.outputOracle(stmt);
+
+        Assert.assertEquals(expected, text);
+
+        System.out.println(text);
+    }
+
+}