rok commented on code in PR #15124:
URL: https://github.com/apache/arrow/pull/15124#discussion_r1059505875
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cpp/src/parquet/encoding.cc:
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@@ -2479,7 +2481,18 @@ class DeltaBitPackDecoder : public DecoderImpl, virtual
public TypedDecoder<DTyp
if (ARROW_PREDICT_FALSE(values_current_mini_block_ == 0)) {
if (ARROW_PREDICT_FALSE(!block_initialized_)) {
buffer[i++] = last_value_;
- if (ARROW_PREDICT_FALSE(i == max_values)) break;
+ if (ARROW_PREDICT_FALSE(i == max_values)) {
+ // When block is uninitialized and `i` reaches max_values, there
are different
+ // cases:
+ // 1. `i == total_value_count_`. It means that the page may have
only one
+ // value, and we should not initialize any block.
+ // 2. `i != total_value_count_`. It means that user just read the
first value
+ // in the page, so, we should initialize the incoming block.
Review Comment:
```suggestion
// When block is uninitialized and i reaches max_values we have
two
// different possibilities:
// 1. i == total_value_count_, which means that the page may
have only one
// value and we should not initialize any block.
// 2. i != total_value_count_ which means that user just read
the first value
// in the page, so we should initialize the incoming block.
```
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