robertwb commented on code in PR #32512:
URL: https://github.com/apache/beam/pull/32512#discussion_r1803668792
##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BeamRowToStorageApiProto.java:
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@@ -289,25 +307,44 @@ private static Object toProtoValue(
case ROW:
return messageFromBeamRow(fieldDescriptor.getMessageType(), (Row)
value, null, -1);
case ARRAY:
- List<Object> list = (List<Object>) value;
- @Nullable FieldType arrayElementType =
beamFieldType.getCollectionElementType();
- if (arrayElementType == null) {
- throw new RuntimeException("Unexpected null element type!");
- }
- return list.stream()
- .map(v -> toProtoValue(fieldDescriptor, arrayElementType, v))
- .collect(Collectors.toList());
case ITERABLE:
Iterable<Object> iterable = (Iterable<Object>) value;
@Nullable FieldType iterableElementType =
beamFieldType.getCollectionElementType();
if (iterableElementType == null) {
- throw new RuntimeException("Unexpected null element type!");
+ throw new RuntimeException("Unexpected null element type: " +
fieldDescriptor.getName());
}
- return StreamSupport.stream(iterable.spliterator(), false)
- .map(v -> toProtoValue(fieldDescriptor, iterableElementType, v))
- .collect(Collectors.toList());
+ // We currently only support maps as non-row or non-scalar element
types
+ // given that BigQuery does not support nested arrays. If the element
type is of map type
+ // we should flatten it given how is being translated (as a list of
proto(key, value).
Review Comment:
IMHO, if BQ doesn't support arrays of arrays (or arrays of maps) we should
reject such rather than implicitly flattening them (which is lossy and could be
unexpected from a user's perspective).
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