wjones127 commented on code in PR #15101:
URL: https://github.com/apache/arrow/pull/15101#discussion_r1060902137
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cpp/src/parquet/arrow/reader_writer_benchmark.cc:
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@@ -197,6 +197,52 @@ BENCHMARK_TEMPLATE2(BM_WriteColumn, true, DoubleType);
BENCHMARK_TEMPLATE2(BM_WriteColumn, false, BooleanType);
BENCHMARK_TEMPLATE2(BM_WriteColumn, true, BooleanType);
+int32_t kInfiniteUniqueValues = -1;
+
+std::shared_ptr<::arrow::Table> RandomStringTable(int64_t length, int64_t
unique_values,
+ int64_t null_percentage) {
+ std::shared_ptr<::arrow::DataType> type = ::arrow::utf8();
+ std::shared_ptr<::arrow::Array> arr;
+ ::arrow::random::RandomArrayGenerator generator(500);
+ double null_probability = static_cast<double>(null_percentage) / 100.0;
+ if (unique_values == kInfiniteUniqueValues) {
+ arr = generator.String(length, /*min_length=*/3, /*max_length=*/32,
+ /*null_probability=*/null_probability);
+ } else {
+ arr = generator.StringWithRepeats(length, /*unique=*/unique_values,
+ /*min_length=*/3, /*max_length=*/32,
+ /*null_probability=*/null_probability);
Review Comment:
I was thinking it would depending on encoding (RLE vs PLAIN), and IIUC we
automatically switch from RLE to plain when we hit a certain threshold of
unique values. Though perhaps it's sufficient to just benchmark 32 unique
values and infinite, rather than several different cardinalities. I will also
make sure to enforce the encoding.
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