mapleFU commented on PR #14341:
URL: https://github.com/apache/arrow/pull/14341#issuecomment-1550607525
@rok I've written a bit ugly random string generator:
```C++
std::shared_ptr<::arrow::Array> generateShareSeqString(
::arrow::random::RandomArrayGenerator& gen, size_t seqNum, double
nullPercent) {
::arrow::StringBuilder builder;
auto seed = gen.seed();
std::shared_ptr<::arrow::Buffer> nullBitMap = nullptr;
if (nullPercent != 0) {
nullBitMap = gen.NullBitmap(seqNum, nullPercent);
}
std::mt19937 engine(seed);
std::uniform_int_distribution<int32_t> igen;
std::string s = "share-seq-string";
std::string prefix = s;
for (size_t i = 0; i < seqNum; ++i) {
if (nullBitMap != nullptr &&
::arrow::bit_util::GetBit(nullBitMap->data(), i)) {
PARQUET_THROW_NOT_OK(builder.AppendNull());
} else {
PARQUET_THROW_NOT_OK(builder.Append(s));
int length = igen(engine) % 4 + 1; // random string length between 1
and 4
std::string randomStr;
for (int j = 0; j < length; j++) {
char c = 'a' + igen(engine) % 26; // random lowercase letter
s += c;
}
s = prefix + randomStr;
if (igen(engine) % 2 == 0) { // randomly change prefix
prefix = s.substr(0, igen(engine) % s.length());
}
}
}
PARQUET_ASSIGN_OR_THROW(auto array, builder.Finish());
if (static_cast<size_t>(array->length()) != seqNum) {
throw ParquetException("Error");
}
return array;
}
```
Maybe you can change a bit and use it
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