davisusanibar commented on code in PR #35570:
URL: https://github.com/apache/arrow/pull/35570#discussion_r1304704056
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java/dataset/src/main/cpp/jni_wrapper.cc:
##########
@@ -470,12 +471,37 @@ JNIEXPORT jlong JNICALL
Java_org_apache_arrow_dataset_jni_JniWrapper_createScann
std::shared_ptr<arrow::dataset::ScannerBuilder> scanner_builder =
JniGetOrThrow(dataset->NewScan());
JniAssertOkOrThrow(scanner_builder->Pool(pool));
- if (columns != nullptr) {
- std::vector<std::string> column_vector = ToStringVector(env, columns);
+ if (columns_subset != nullptr) {
+ std::vector<std::string> column_vector = ToStringVector(env,
columns_subset);
JniAssertOkOrThrow(scanner_builder->Project(column_vector));
}
+ if (columns_to_produce_or_filter != nullptr) {
+ auto *buff =
reinterpret_cast<jbyte*>(env->GetDirectBufferAddress(columns_to_produce_or_filter));
+ int length = env->GetDirectBufferCapacity(columns_to_produce_or_filter);
+ std::shared_ptr<arrow::Buffer> buffer =
JniGetOrThrow(arrow::AllocateBuffer(length));
+ std::memcpy(buffer->mutable_data(), buff, length);
+ arrow::engine::BoundExpressions bounded_expression =
+ JniGetOrThrow(arrow::engine::DeserializeExpressions(*buffer));
Review Comment:
Can you give me an example, I didn't catch the idea.
##########
java/dataset/src/main/cpp/jni_wrapper.cc:
##########
@@ -470,12 +471,37 @@ JNIEXPORT jlong JNICALL
Java_org_apache_arrow_dataset_jni_JniWrapper_createScann
std::shared_ptr<arrow::dataset::ScannerBuilder> scanner_builder =
JniGetOrThrow(dataset->NewScan());
JniAssertOkOrThrow(scanner_builder->Pool(pool));
- if (columns != nullptr) {
- std::vector<std::string> column_vector = ToStringVector(env, columns);
+ if (columns_subset != nullptr) {
+ std::vector<std::string> column_vector = ToStringVector(env,
columns_subset);
JniAssertOkOrThrow(scanner_builder->Project(column_vector));
}
+ if (columns_to_produce_or_filter != nullptr) {
+ auto *buff =
reinterpret_cast<jbyte*>(env->GetDirectBufferAddress(columns_to_produce_or_filter));
+ int length = env->GetDirectBufferCapacity(columns_to_produce_or_filter);
+ std::shared_ptr<arrow::Buffer> buffer =
JniGetOrThrow(arrow::AllocateBuffer(length));
+ std::memcpy(buffer->mutable_data(), buff, length);
+ arrow::engine::BoundExpressions bounded_expression =
+ JniGetOrThrow(arrow::engine::DeserializeExpressions(*buffer));
+ std::vector<arrow::compute::Expression> project_exprs;
+ std::vector<std::string> project_names;
+ arrow::compute::Expression filter_expr;
+ int filter_count = 0;
+ for(arrow::engine::NamedExpression named_expression :
bounded_expression.named_expressions) {
Review Comment:
added
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