lidavidm commented on a change in pull request #11704:
URL: https://github.com/apache/arrow/pull/11704#discussion_r750417849
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File path: cpp/src/arrow/dataset/test_util.h
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@@ -631,12 +646,92 @@ class FileFormatScanMixin : public
FileFormatFixtureMixin<FormatHelper>,
for (auto maybe_batch : PhysicalBatches(fragment)) {
ASSERT_OK_AND_ASSIGN(auto batch, maybe_batch);
row_count += batch->num_rows();
- AssertSchemaEqual(*batch->schema(), *expected_schema,
- /*check_metadata=*/false);
+ ASSERT_THAT(
+ batch->schema()->fields(),
+ ::testing::UnorderedPointwise(PointeesEquals(),
expected_schema->fields()))
+ << "EXPECTED:\n"
+ << expected_schema->ToString() << "\nACTUAL:\n"
+ << batch->schema()->ToString();
}
ASSERT_EQ(row_count, expected_rows());
}
+ void TestScanProjectedNested(bool fine_grained_selection = false) {
+ auto f32 = field("f32", float32());
+ auto f64 = field("f64", float64());
+ auto i32 = field("i32", int32());
+ auto i64 = field("i64", int64());
+ auto struct1 = field("struct1", struct_({f32, i32}));
+ auto struct2 = field("struct2", struct_({f64, i64, struct1}));
+ this->SetSchema({struct1, struct2, f32, f64, i32, i64});
+ this->ProjectNested({".struct1.f32", ".struct2.struct1",
".struct2.struct1.f32"});
+ this->SetFilter(equal(field_ref(FieldRef("struct2", "i64")), literal(0)));
+
+ std::shared_ptr<Schema> expected_schema;
+ if (fine_grained_selection) {
+ // Some formats, like Parquet, let you pluck only a part of a complex
type
+ expected_schema = schema({
+ field("struct1", struct_({f32})),
+ field("struct2", struct_({i64, struct1})),
+ });
+ } else {
+ expected_schema = schema({struct1, struct2});
+ }
Review comment:
No tests will change (other than the one marked already), but as-is, you
can't scan a Parquet dataset and project a nested field (since when we project
from the specific schema to the dataset schema, we'll fail).
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