rdblue commented on code in PR #6622:
URL: https://github.com/apache/iceberg/pull/6622#discussion_r1116142869


##########
spark/v3.3/spark-extensions/src/test/java/org/apache/iceberg/spark/extensions/TestMergeOnReadDelete.java:
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@@ -118,4 +122,32 @@ public void testCommitUnknownException() {
         ImmutableList.of(row(1, "hr", "c1"), row(3, "hr", "c1")),
         sql("SELECT * FROM %s ORDER BY id", "dummy_catalog.default.table"));
   }
+
+  @Test
+  public void testAggregatePushDownInMergeOnReadDelete() {
+    createAndInitTable("id LONG, data INT");
+    sql(
+        "INSERT INTO TABLE %s VALUES (1, 1111), (1, 2222), (2, 3333), (2, 
4444), (3, 5555), (3, 6666) ",
+        tableName);
+
+    sql("DELETE FROM %s WHERE data = 1111", tableName);
+    String select = "SELECT max(data), min(data), count(data) FROM %s";
+
+    List<Object[]> explain = sql("EXPLAIN " + select, tableName);
+    String explainString = explain.get(0)[0].toString();
+    boolean explainContainsPushDownAggregates = false;
+    if (explainString.contains("max(data)".toLowerCase(Locale.ROOT))

Review Comment:
   There should be no need to call `toLowerCase` on string literals. Instead, 
we generally just make sure they don't contain upper case characters. The 
explain string is what needs to be lower case so that these lower case literals 
can match.



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