yiguolei commented on code in PR #50149:
URL: https://github.com/apache/doris/pull/50149#discussion_r2051925169


##########
regression-test/suites/nereids_p0/sql_functions/string_functions/test_string_function.groovy:
##########
@@ -188,6 +188,31 @@ suite("test_string_function") {
     qt_sql "select elt(1, \"hello\", \"doris\");"
     qt_sql "select elt(2, \"hello\", \"doris\");"
     qt_sql "select elt(3, \"hello\", \"doris\");"
+    qt_sql """
+    SELECT t1.no
+      ,t1.sub_str
+      ,t1.str
+      ,substring_index(t1.str, t1.sub_str, -1)

Review Comment:
   should write 2 cases:
   1. insert the data into a table and then use select statement to test it.
   2. test constant value



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