szehon-ho commented on code in PR #13167:
URL: https://github.com/apache/iceberg/pull/13167#discussion_r2155751197


##########
spark/v4.0/spark/src/test/java/org/apache/iceberg/spark/sql/TestStoragePartitionedJoins.java:
##########
@@ -549,6 +555,146 @@ public void testJoinsWithMismatchingPartitionKeys() {
         tableName(OTHER_TABLE_NAME));
   }
 
+  @TestTemplate
+  public void testJoinsCompatibleBucketNumbers() {
+    sql(
+        "CREATE TABLE %s (id BIGINT, int_col INT, dep STRING)"
+            + "USING iceberg "
+            + "PARTITIONED BY (bucket(4, id))"
+            + "TBLPROPERTIES (%s)",
+        tableName, tablePropsAsString(TABLE_PROPERTIES));
+
+    sql(
+        "INSERT INTO %s VALUES "
+            + "(1L, 100, 'software'),"
+            + "(2L, 101, 'hr'),"
+            + "(3L, 102, 'operation'),"
+            + "(4L, 103, 'sales'),"
+            + "(5L, 104, 'marketing'),"
+            + "(6L, 105, 'pr')",
+        tableName);
+
+    sql(
+        "CREATE TABLE %s (id BIGINT, int_col INT, dep STRING)"
+            + "USING iceberg "
+            + "PARTITIONED BY (bucket(6, id))"
+            + "TBLPROPERTIES (%s)",
+        tableName(OTHER_TABLE_NAME), tablePropsAsString(TABLE_PROPERTIES));
+
+    sql(
+        "INSERT INTO %s VALUES "
+            + "(1L, 100, 'software'),"
+            + "(3L, 300, 'hardware'),"
+            + "(4L, 103, 'sales'),"
+            + "(5L, 104, 'marketing'),"
+            + "(6L, 105, 'pr')",
+        tableName(OTHER_TABLE_NAME));
+
+    assertPartitioningAwarePlan(
+        1, /* expected num of shuffles with SPJ */
+        3, /* expected num of shuffles without SPJ */
+        "SELECT * "
+            + "FROM %s t1 "
+            + "INNER JOIN %s t2 "
+            + "ON t1.id = t2.id "
+            + "ORDER BY t1.id, t1.int_col, t1.dep, t2.id, t2.int_col, t2.dep",
+        tableName,
+        tableName(OTHER_TABLE_NAME));
+  }
+
+  @TestTemplate
+  public void testJoinsWithEqualBucketNumbers() {

Review Comment:
   btw, my idea for the 1 vs 3 case was to test this line:  
https://github.com/himadripal/iceberg/blob/feat_spj_bucket_reducer/spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/functions/BucketFunction.java#L147
   
   >  if (commonDivisor > 1 ...
   
   Otherwise the 3 side thinks there's a gcd and will trigger SPJ



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