wayneguow commented on code in PR #47481:
URL: https://github.com/apache/spark/pull/47481#discussion_r1696270884


##########
sql/core/src/test/scala/org/apache/spark/sql/StringFunctionsSuite.scala:
##########
@@ -424,6 +424,14 @@ class StringFunctionsSuite extends QueryTest with 
SharedSparkSession {
       df.selectExpr("substring_index(a, '.', 2)"),
       Row("www.apache")
     )
+
+    val testTable = "test_substring_index"
+    withTable(testTable) {
+      sql(s"CREATE TABLE $testTable (num int) USING parquet")
+      sql(s"INSERT INTO $testTable VALUES (1), (2), (3), (NULL)")

Review Comment:
   Oh, I see. I double-checked and it can also trigger this bug by correct 
numbers without null values. And I also updated the title and description of 
this PR.



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