diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelect.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelect.java
index 690a715ca4..c0625dc2cd 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelect.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelect.java
@@ -247,9 +247,7 @@ public class SQLSelect extends SQLObjectImpl {
         }
 
         if (this.hints != null) {
-            for (SQLHint hint : this.hints) {
-                x.hints.add(hint);
-            }
+            x.hints.addAll(this.hints);
         }
 
         x.forBrowse = forBrowse;
diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelectQueryBlock.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelectQueryBlock.java
index 033df7524d..3a4cbbb9a2 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelectQueryBlock.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelectQueryBlock.java
@@ -166,9 +166,7 @@ public class SQLSelectQueryBlock extends SQLObjectImpl implements SQLSelectQuery
                         SQLInListExpr inListItem = (SQLInListExpr) item;
                         if (inListExpr.getExpr().equals(inListItem.getExpr())) {
                             TreeSet<SQLExpr> set = new TreeSet<SQLExpr>();
-                            for (SQLExpr itemItem : inListItem.getTargetList()) {
-                                set.add(itemItem);
-                            }
+                            set.addAll(inListItem.getTargetList());
 
                             List<SQLExpr> andList = new ArrayList<SQLExpr>();
                             for (SQLExpr exprItem : inListExpr.getTargetList()) {