TheNeuralBit commented on a change in pull request #16720:
URL: https://github.com/apache/beam/pull/16720#discussion_r801137693
##########
File path:
sdks/java/io/google-cloud-platform/src/test/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryIOStorageQueryTest.java
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@@ -753,6 +762,31 @@ public void testQuerySourceCreateReader() throws Exception
{
querySource.createReader(options);
}
+ @Test
+ public void testActuateProjectionPushdown() {
+ org.apache.beam.sdk.schemas.Schema schema =
+ org.apache.beam.sdk.schemas.Schema.builder()
+ .addStringField("foo")
+ .addStringField("bar")
+ .build();
+ TypedRead<Row> read =
+ BigQueryIO.read(
+ record ->
+ BigQueryUtils.toBeamRow(
+ record.getRecord(), schema,
ConversionOptions.builder().build()))
+ .withMethod(Method.DIRECT_READ)
+ .withCoder(SchemaCoder.of(schema));
+
+ assertTrue(read.supportsProjectionPushdown());
+ PTransform<PBegin, PCollection<Row>> pushdownT =
+ read.actuateProjectionPushdown(
+ ImmutableMap.of(new TupleTag<>("output"),
FieldAccessDescriptor.withFieldNames("foo")));
+
+ TypedRead<Row> pushdownRead = (TypedRead<Row>) pushdownT;
+ assertEquals(Method.DIRECT_READ, pushdownRead.getMethod());
+ assertThat(pushdownRead.getSelectedFields().get(),
Matchers.containsInAnyOrder("foo"));
+ }
Review comment:
You might also add a unit test for the supportProjectPushdown = false
case
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