szehon-ho commented on code in PR #13166:
URL: https://github.com/apache/iceberg/pull/13166#discussion_r2122404958


##########
spark/v4.0/spark/src/test/java/org/apache/iceberg/spark/sql/TestStoragePartitionedJoins.java:
##########
@@ -578,6 +584,62 @@ public void testAggregates() throws NoSuchTableException {
         tableName(OTHER_TABLE_NAME));
   }
 
+  @TestTemplate
+  public void testJoinsHourToDays() throws NoSuchTableException {
+    String createTableStmt =
+        "CREATE TABLE %s ("
+            + "id BIGINT, int_col INT,dep STRING,timestamp_col TIMESTAMP) "
+            + "USING iceberg "
+            + "PARTITIONED BY (days(timestamp_col)) "
+            + "TBLPROPERTIES (%s)";
+
+    sql(createTableStmt, tableName, tablePropsAsString(TABLE_PROPERTIES));
+
+    sql("INSERT INTO %s VALUES (1L, 100, 'software', TIMESTAMP('2024-11-11 
10:00:00'))", tableName);

Review Comment:
   same, i would make this into one insert to save test time



##########
spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/functions/DaysFunction.java:
##########
@@ -70,6 +73,11 @@ public String name() {
     public DataType resultType() {
       return DataTypes.DateType;
     }
+
+    @Override
+    public Reducer<Integer, Integer> reducer(ReducibleFunction<?, ?> 
otherFunction) {

Review Comment:
   is there a point to implementing ReducibleFunction here?



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