bkietz commented on a change in pull request #7378:
URL: https://github.com/apache/arrow/pull/7378#discussion_r436930007
##########
File path: cpp/src/arrow/c/bridge.cc
##########
@@ -1320,14 +1324,16 @@ struct ArrayImporter {
Status Visit(const UnionType& type) {
auto mode = type.mode();
- RETURN_NOT_OK(CheckNumBuffers(3));
+ if (mode == UnionMode::SPARSE) {
+ RETURN_NOT_OK(CheckNumBuffers(2));
+ } else {
+ RETURN_NOT_OK(CheckNumBuffers(3));
+ }
Review comment:
@pitrou
##########
File path: cpp/src/arrow/c/bridge.cc
##########
@@ -1320,14 +1324,16 @@ struct ArrayImporter {
Status Visit(const UnionType& type) {
auto mode = type.mode();
- RETURN_NOT_OK(CheckNumBuffers(3));
+ if (mode == UnionMode::SPARSE) {
+ RETURN_NOT_OK(CheckNumBuffers(2));
+ } else {
+ RETURN_NOT_OK(CheckNumBuffers(3));
+ }
Review comment:
I did not change the IPC format, which has always stored just two
buffers in the sparse case. See
https://github.com/apache/arrow/pull/7378/files#diff-78fdd845f659c6d03d17716eb6e27cebR316
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