bug fixed for SchemaStat for Hierarchical Query pseudocolumn.

src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java

@@ -968,14 +968,13 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
         }
 
         if ("LEVEL".equalsIgnoreCase(ident) || "CONNECT_BY_ISCYCLE".equalsIgnoreCase(ident)) {
-            SQLObject parent = x.getParent();
-            if (parent instanceof SQLSelectItem) {
-                SQLObject parent2 = parent.getParent();
-                if (parent2 instanceof SQLSelectQueryBlock) {
-                    SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) parent2;
+            for (SQLObject parent = x.getParent(); parent != null; parent = parent.getParent()) {
+                if (parent instanceof SQLSelectQueryBlock) {
+                    SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) parent;
                     if (queryBlock.getStartWith() != null || queryBlock.getConnectBy() != null) {
                         return false;
                     }
+                    break;
                 }
             }
         }

src/test/java/com/alibaba/druid/bvt/sql/oracle/select/OracleSelectTest_hierarchical_CONNECT_BY_ISCYCLE.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 1999-2017 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.oracle.select;
+
+import com.alibaba.druid.sql.OracleTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
+import com.alibaba.druid.stat.TableStat;
+import com.alibaba.druid.util.JdbcConstants;
+
+import java.util.List;
+
+public class OracleSelectTest_hierarchical_CONNECT_BY_ISCYCLE extends OracleTest {
+
+    public void test_0() throws Exception {
+        String sql = "SELECT last_name \"Employee\", CONNECT_BY_ISCYCLE \"Cycle\",\n" +
+                "   LEVEL, SYS_CONNECT_BY_PATH(last_name, '/') \"Path\"\n" +
+                "   FROM employees\n" +
+                "   WHERE level <= 3 AND department_id = 80\n" +
+                "   START WITH last_name = 'King'\n" +
+                "   CONNECT BY NOCYCLE PRIOR employee_id = manager_id AND LEVEL <= 4;"; //
+
+        List<SQLStatement> statementList = SQLUtils.parseStatements(sql, JdbcConstants.ORACLE);
+        SQLStatement statemen = statementList.get(0);
+        print(statementList);
+
+        assertEquals(1, statementList.size());
+
+        SchemaStatVisitor visitor = SQLUtils.createSchemaStatVisitor(JdbcConstants.ORACLE);
+        statemen.accept(visitor);
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("relationships : " + visitor.getRelationships());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        assertEquals(1, visitor.getTables().size());
+
+        assertTrue(visitor.getTables().containsKey(new TableStat.Name("employees")));
+
+        assertEquals(4, visitor.getColumns().size());
+
+//        Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("pivot_table", "*")));
+//        Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("pivot_table", "YEAR")));
+//        Assert.assertTrue(visitor.getColumns().contains(new TableStat.Column("pivot_table", "order_mode")));
+    }
+}