ibzib commented on a change in pull request #15216:
URL: https://github.com/apache/beam/pull/15216#discussion_r677012282
##########
File path:
sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/meta/provider/SchemaIOTableProviderWrapper.java
##########
@@ -118,6 +123,34 @@ public Schema getSchema() {
return begin.apply(readerTransform);
}
+ @Override
+ public PCollection<Row> buildIOReader(
+ PBegin begin, BeamSqlTableFilter filters, List<String> fieldNames) {
+ PTransform<PBegin, PCollection<Row>> readerTransform =
schemaIO.buildReader();
+ if (readerTransform instanceof PushdownProjector) {
+ PushdownProjector pushdownProjector = (PushdownProjector)
readerTransform;
+ FieldAccessDescriptor fieldAccessDescriptor =
+ FieldAccessDescriptor.withFieldNames(fieldNames);
+ // The pushdown must return a PTransform that can be applied to a
PBegin, or this cast will
+ // fail.
+ readerTransform =
+ (PTransform<PBegin, PCollection<Row>>)
+
pushdownProjector.withProjectionPushdown(fieldAccessDescriptor);
+ }
Review comment:
Done.
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