milesgranger commented on code in PR #14326:
URL: https://github.com/apache/arrow/pull/14326#discussion_r998291679


##########
cpp/src/arrow/dataset/scanner_test.cc:
##########
@@ -1074,6 +1074,24 @@ TEST_P(TestScanner, ProjectedScanNested) {
   AssertScanBatchesUnorderedEqualRepetitionsOf(MakeScanner(batch_in), 
batch_out);
 }
 
+TEST_P(TestScanner, ProjectedScanNestedFromNames) {
+  SetSchema({
+      field("struct", struct_({field("i32", int32()), field("f64", 
float64())})),
+      field("nested", struct_({field("left", int32()),
+                               field("right", struct_({field("i32", int32()),
+                                                       field("f64", 
float64())}))})),
+  });
+  ASSERT_OK_AND_ASSIGN(auto descr,
+                       ProjectionDescr::FromNames({"struct.i32", 
"nested.right.f64"},
+                                                  *options_->dataset_schema))
+  SetProjection(options_.get(), std::move(descr));
+  auto batch_in = ConstantArrayGenerator::Zeroes(GetParam().items_per_batch, 
schema_);
+  auto batch_out = ConstantArrayGenerator::Zeroes(
+      GetParam().items_per_batch,
+      schema({field("struct.i32", int32()), field("nested.right.f64", 
float64())}));

Review Comment:
   Found and fixed in 
https://github.com/apache/arrow/pull/14326/commits/ae5b01d2ce7c67fba5fc17028e6230fb550d2535,
 verified it'll fail with different field names. All other tests continued to 
pass locally, so didn't bother to propagate the `check_metadata` parameter up 
further from `AssertBatchEquals`.



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