pabloem commented on code in PR #22926:
URL: https://github.com/apache/beam/pull/22926#discussion_r956758177
##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryIO.java:
##########
@@ -1232,22 +1232,49 @@ void cleanup(PassThroughThenCleanup.ContextContainer c)
throws Exception {
return rows;
}
- private PCollection<T> expandForDirectRead(PBegin input, Coder<T>
outputCoder) {
+ private PCollection<T> expandForDirectRead(
+ PBegin input, Coder<T> outputCoder, boolean beamSchemaEnabled) {
ValueProvider<TableReference> tableProvider = getTableProvider();
Pipeline p = input.getPipeline();
+ BigQuerySourceDef srcDef = createSourceDef();
if (tableProvider != null) {
// No job ID is required. Read directly from BigQuery storage.
- return p.apply(
- org.apache.beam.sdk.io.Read.from(
- BigQueryStorageTableSource.create(
- tableProvider,
- getFormat(),
- getSelectedFields(),
- getRowRestriction(),
- getParseFn(),
- outputCoder,
- getBigQueryServices(),
- getProjectionPushdownApplied())));
+ PCollection<T> rows =
+ p.apply(
+ org.apache.beam.sdk.io.Read.from(
+ BigQueryStorageTableSource.create(
+ tableProvider,
+ getFormat(),
+ getSelectedFields(),
+ getRowRestriction(),
+ getParseFn(),
+ outputCoder,
+ getBigQueryServices(),
+ getProjectionPushdownApplied())));
+ if (beamSchemaEnabled) {
+ BigQueryOptions bqOptions = p.getOptions().as(BigQueryOptions.class);
+ Schema beamSchema = srcDef.getBeamSchema(bqOptions);
+
+ List<Schema.Field> flds =
+ beamSchema.getFields().stream()
+ .filter(
+ field -> {
+ if (getSelectedFields() != null
+ && getSelectedFields().isAccessible()
+ && getSelectedFields().get() != null) {
+ return
getSelectedFields().get().contains(field.getName());
+ } else {
+ return true;
+ }
+ })
+ .collect(Collectors.toList());
+
+ beamSchema = Schema.builder().addFields(flds).build();
+ SerializableFunction<T, Row> toBeamRow =
getToBeamRowFn().apply(beamSchema);
+ SerializableFunction<Row, T> fromBeamRow =
getFromBeamRowFn().apply(beamSchema);
Review Comment:
yes right! It relies on BQUtils to generate a converter function.
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