[fix](fe) Inconsistent behavior for string comparison in FE and BE (#13604)

Author: nextdreamblue

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

@@ -96,9 +96,9 @@ public int compareLiteral(LiteralExpr expr) {
         int minLength = Math.min(thisBytes.length, otherBytes.length);
         int i = 0;
         for (i = 0; i < minLength; i++) {
-            if (thisBytes[i] < otherBytes[i]) {
+            if (Byte.toUnsignedInt(thisBytes[i]) < Byte.toUnsignedInt(otherBytes[i])) {
                 return -1;
-            } else if (thisBytes[i] > otherBytes[i]) {
+            } else if (Byte.toUnsignedInt(thisBytes[i]) > Byte.toUnsignedInt(otherBytes[i])) {
                 return 1;
             }
         }

regression-test/data/query_p0/sort/sort.out

@@ -7,3 +7,6 @@
 2022-01-01	1
 汇总	1
 
+-- !sort_string_on_fe --
+true
+

regression-test/suites/query_p0/sort/sort.groovy

@@ -22,4 +22,5 @@
 suite("sort") {
     qt_sort_string_single_column """ select * from ( select '汇总' as a union all select '2022-01-01' as a ) a order by 1 """
     qt_sort_string_multiple_columns """ select * from ( select '汇总' as a,1 as b union all select '2022-01-01' as a,1 as b ) a order by 1,2 """
+    qt_sort_string_on_fe """ select '汇总' > '2022-01-01' """
 }