pvary commented on a change in pull request #2765:
URL: https://github.com/apache/hive/pull/2765#discussion_r744568098
##########
File path:
iceberg/iceberg-handler/src/test/java/org/apache/iceberg/mr/hive/TestHiveIcebergSelects.java
##########
@@ -203,4 +204,29 @@ public void testScanTableCaseInsensitive() throws
IOException {
Assert.assertArrayEquals(new Object[] {0L, "Alice", "Brown"}, rows.get(0));
Assert.assertArrayEquals(new Object[] {1L, "Bob", "Green"}, rows.get(1));
}
+
+ /**
+ * Column pruning could become problematic when a single Map Task contains
multiple TableScan operators where
+ * different columns are pruned. This only occurs on MR, as Tez initializes
a single Map task for every TableScan
+ * operator.
+ */
+ @Test
+ public void testMultiColumnPruning() throws IOException {
+ shell.setHiveSessionValue("hive.cbo.enable", true);
+
+ Schema schema1 = new Schema(optional(1, "fk", Types.StringType.get()));
+ List<Record> records1 =
TestHelper.RecordsBuilder.newInstance(schema1).add("fk1").build();
+ testTables.createTable(shell, "table1", schema1, fileFormat, records1);
+
+ Schema schema2 = new Schema(optional(1, "fk", Types.StringType.get()),
optional(2, "val", Types.StringType.get()));
+ List<Record> records2 =
TestHelper.RecordsBuilder.newInstance(schema2).add("fk1", "val").build();
+ testTables.createTable(shell, "table2", schema2, fileFormat, records2);
+
+ // MR is needed for the reproduction
+ shell.setHiveSessionValue("hive.execution.engine", "mr");
Review comment:
I am not sure that Hive removed MR support (I think not yet, but there
is no active development maintaining it), but Hive - Iceberg definitely needs
Tez.
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