maropu commented on a change in pull request #29577:
URL: https://github.com/apache/spark/pull/29577#discussion_r479766922



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
##########
@@ -541,7 +541,8 @@ object Overlay {
        Spark ANSI SQL
       > SELECT _FUNC_(encode('Spark SQL', 'utf-8') PLACING encode('tructured', 
'utf-8') FROM 2 FOR 4);
        Structured SQL
-  """)
+  """,
+  since = "3.0.0")

Review comment:
       Is this change related to this PR? btw, could we add tests to check if a 
`since` field is defined in all the expressions? I think it is important to 
define this field when adding a new expr. 




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