[fix-33465][core]别名使用as字符串切割问题修复

Author: simenliuxing

core/src/main/java/com/dtstack/flink/sql/side/JoinNodeDealer.java

@@ -979,7 +979,7 @@ private SqlIdentifier checkAndReplaceJoinCondition(SqlNode node, Map<String, Str
     public Map<String, String> buildTmpTableFieldRefOriField(Set<String> fieldSet, String newTableAliasName){
         Map<String, String> refInfo = Maps.newConcurrentMap();
         for(String field : fieldSet){
-            String[] fields = StringUtils.splitByWholeSeparator(field, "as");
+            String[] fields = StringUtils.splitByWholeSeparator(field, " as ");
             if (fields != null) {
                 fields = Stream
                         .of(fields)