rok commented on issue #14923:
URL: https://github.com/apache/arrow/issues/14923#issuecomment-1359298379
Sorry this took a while, here's a test with examples generated with
`this->Execute(65, 1);`:
```
class DeltaBitPackEncoding : public TestArrowBuilderDecoding {
public:
void SetupEncoderDecoder() override {}
};
TEST_F(DeltaBitPackEncoding, Example) {
std::shared_ptr<ColumnDescriptor> descr_ = ExampleDescr<Int32Type>();
auto decoder = MakeTypedDecoder<Int32Type>(Encoding::DELTA_BINARY_PACKED,
descr_.get());
using c_type = parquet::Int32Type::c_type;
unsigned char good_data [] = "\200\001\004A\237\224\316\362\r\242\220\203-
";
int encode_buffer_size = 273;
int num_values = 65;
std::vector<uint8_t> output_bytes = std::vector<uint8_t>(num_values *
sizeof(c_type));
auto decode_buf = reinterpret_cast<c_type*>(output_bytes.data());
decoder->SetData(num_values, &good_data[0], encode_buffer_size);
int values_decoded = decoder->Decode(decode_buf, num_values);
ASSERT_EQ(num_values, values_decoded);
unsigned char bad_data[] =
"\200\001\004A\237\224\316\362\r\242\220\203- "
"\245\245\304;`\210'\313\r\270D\316\306h㖀~\372\255\360A\254}\211L\343\373_"
"\034®\312Y\036\233<\203\035P\202)\307Y\356\327\024\302!\232\036,"
"\271\b\331\353\037e\333\332\315Crm\203\350בOo\001\347\305Z\203G\037\263Y\254\366_"
"\"\v\276\242Y\002\374\300\226\231\252C\240\363ۙ\r\334E\314\f\002\255\227\273\307"
"\305'\"\033\235\374\250\243\244F\266\254\350\203\304U\036X\331&\210/"
"\037\322\321s.\031e/"
"\232\340\363\366\306\030\243,5\337\031\005bw\021\017wj\003#Q`\371ʉ\323\300+~="
"\232W\232\374p\336$\022\211VQ\237>\v1gە'\224\207\262f\247h\363A!"
"\255\271f\026\274\033_\333)4";
output_bytes = std::vector<uint8_t>(num_values * sizeof(c_type));
decode_buf = reinterpret_cast<c_type*>(output_bytes.data());
decoder->SetData(num_values, &bad_data[0], encode_buffer_size);
}
```
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