[Fix](planner)fix create view ignore order by info bug. (#18197)

fe/fe-core/src/main/java/org/apache/doris/analysis/SelectStmt.java

@@ -57,6 +57,7 @@ import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import org.apache.commons.collections.CollectionUtils;
 import org.apache.commons.collections.MapUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -2223,13 +2224,7 @@ public class SelectStmt extends QueryStmt {
         // Order By clause
         if (orderByElements != null) {
             strBuilder.append(" ORDER BY ");
-            for (int i = 0; i < orderByElements.size(); ++i) {
-                strBuilder.append(orderByElements.get(i).getExpr().toSql());
-                if (sortInfo != null) {
-                    strBuilder.append((sortInfo.getIsAscOrder().get(i)) ? " ASC" : " DESC");
-                }
-                strBuilder.append((i + 1 != orderByElements.size()) ? ", " : "");
-            }
+            strBuilder.append(StringUtils.join(orderByElements, ", "));
         }
         // Limit clause.
         if (hasLimitClause()) {

fe/fe-core/src/test/java/org/apache/doris/catalog/CreateViewTest.java

@@ -191,7 +191,7 @@ public class CreateViewTest {
         Assert.assertEquals(
                 "WITH test1_cte(w1, w2) AS (SELECT `k1`, `k2` FROM `default_cluster:test`.`tbl1`) "
                         + "SELECT `w1` AS `c1`, sum(`w2`) AS `c2` FROM `test1_cte` WHERE `w1` > 10 GROUP BY `w1` "
-                        + "ORDER BY `w1` ASC",
+                        + "ORDER BY `w1` ASC NULLS FIRST",
                 alter1.getInlineViewDef());
     }
 }