kennknowles commented on code in PR #16721:
URL: https://github.com/apache/beam/pull/16721#discussion_r927921137
##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/RowWriterFactory.java:
##########
@@ -129,7 +127,18 @@ OutputType getOutputType() {
@Override
BigQueryRowWriter<ElementT> createRowWriter(String tempFilePrefix,
DestinationT destination)
throws Exception {
+ if (dynamicDestinations == null) {
+ throw new IllegalStateException(
+ "createRowWriter called when dynamicDestinations is null; forgot
to call prepare()?");
+ }
+ if (schemaFactory == null) {
+ throw new IllegalStateException(
+ "createRowWriter called when schemaFactory is null; forgot to call
prepare()?");
+ }
TableSchema tableSchema = dynamicDestinations.getSchema(destination);
+ if (tableSchema == null) {
Review Comment:
SGTM. You'll need to add the requirement that all `schemaFactory` that can
be passed in can handle a null.
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