mapleFU commented on PR #15241:
URL: https://github.com/apache/arrow/pull/15241#issuecomment-1377596076
Let's go back to the original code:
```c++
if (ARROW_PREDICT_FALSE(values_remaining_current_mini_block_ == 0)) {
if (ARROW_PREDICT_FALSE(!first_block_initialized_)) {
buffer[i++] = last_value_;
DCHECK_EQ(i, 1); // we're at the beginning of the page
DCHECK_EQ(values_num_up_to_current_mini_block_, 0);
values_num_up_to_current_mini_block_ = 1;
if (ARROW_PREDICT_FALSE(i == max_values)) {
// When block is uninitialized and i reaches max_values we have
two
// different possibilities:
// 1. total_value_count_ == 1, which means that the page may
have only
// one value (encoded in the header), and we should not
initialize
// any block.
// 2. total_value_count_ != 1, which means we should initialize
the
// incoming block for subsequent reads.
if (total_value_count_ != 1) {
InitBlock();
}
break;
}
InitBlock();
}
```
And assume the page has 33 values:
1. `total_value_count_ == 1`, call `InitBlock`
2. `current_num_values = 0`, read block one, change to 32.
3. `current_num_values = 32`, read block one, change to 64.
But here, it should be `1` firstly.
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