rizaon commented on a change in pull request #990:
URL: https://github.com/apache/orc/pull/990#discussion_r780620218
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File path: c++/src/ColumnReader.cc
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@@ -1006,9 +1009,12 @@ namespace orc {
if (stream == nullptr)
throw ParseError("LENGTH stream not found in List column");
rle = createRleDecoder(std::move(stream), false, vers, memoryPool);
- const Type& childType = *type.getSubtype(0);
- if (selectedColumns[static_cast<uint64_t>(childType.getColumnId())]) {
- child = buildReader(childType, stripe);
+ ArrayReadIntent intent = stripe.getReadIntent(columnId);
+ if (intent == ArrayReadIntent_ALL) {
+ const Type &childType = *type.getSubtype(0);
+ if (selectedColumns[static_cast<uint64_t>(childType.getColumnId())]) {
+ child = buildReader(childType, stripe);
+ }
Review comment:
I replace this with 4 new tests at `c++/test/TestReader.cc`.
However, they stop at column selection verification and do not read a row
batch.
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