[Spark][TEST-ONLY] Test identity high water mark inserts when target table has no high water mark

spark/src/test/scala/org/apache/spark/sql/delta/IdentityColumnIngestionSuite.scala

@@ -419,6 +419,42 @@ trait IdentityColumnIngestionSuiteBase extends IdentityColumnTestUtils {
     }
   }
 
+  test("Appending from a source table with a high water mark should not update" +
+    " the target table's high water mark") {
+    withSrcAndDestTables(
+      isSrcDataSubsetOfTgt = false,
+      positiveStep = true,
+      expectValidHighWaterMark = false) { (srcTblName, tgtTblName) =>
+      val tgtDeltaLog = DeltaLog.forTable(spark, TableIdentifier(tgtTblName))
+      // dataframe v2
+      spark.table(srcTblName).writeTo(tgtTblName).append()
+      assert(getHighWaterMark(tgtDeltaLog.update(), colName = "id").isEmpty,
+        "High watermark should not be set for user inserted data.")
+
+      // v1
+      spark.table(srcTblName).write.format("delta").mode("append").saveAsTable(tgtTblName)
+      assert(getHighWaterMark(tgtDeltaLog.update(), colName = "id").isEmpty,
+        "High watermark should not be set for user inserted data.")
+
+      spark.table(srcTblName).write.insertInto(tgtTblName)
+      assert(getHighWaterMark(tgtDeltaLog.update(), colName = "id").isEmpty,
+        "High watermark should not be set for user inserted data.")
+
+      // SQL
+      sql(s"INSERT INTO $tgtTblName SELECT * FROM $srcTblName")
+      assert(getHighWaterMark(tgtDeltaLog.update(), colName = "id").isEmpty,
+        "High watermark should not be set for user inserted data.")
+
+      sql(s"INSERT INTO $tgtTblName BY NAME SELECT * FROM $srcTblName")
+      assert(getHighWaterMark(tgtDeltaLog.update(), colName = "id").isEmpty,
+        "High watermark should not be set for user inserted data.")
+
+      sql(s"INSERT INTO $tgtTblName(id, value) SELECT id, value FROM $srcTblName")
+      assert(getHighWaterMark(tgtDeltaLog.update(), colName = "id").isEmpty,
+        "High watermark should not be set for user inserted data.")
+    }
+  }
+
   for {
     cdfEnabled <- DeltaTestUtils.BOOLEAN_DOMAIN
     isSrcDataSubsetOfTgt <- DeltaTestUtils.BOOLEAN_DOMAIN