[GitHub] [beam] svetakvsundhar commented on a diff in pull request #22926: [WIP] Adding support for Beam Schema Rows with BQ DIRECT_READ

[GitBox <gi...@apache.org>]

svetakvsundhar commented on code in PR #22926:
URL: https://github.com/apache/beam/pull/22926#discussion_r956625390


##########
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:
   is the purpose of this here when we wan't to convert something from a `BeamRow` type into another type? (e.g. the WriteToBQ case)



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