pitrou commented on a change in pull request #11041:
URL: https://github.com/apache/arrow/pull/11041#discussion_r700411311
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File path: cpp/src/arrow/compute/exec/key_encode.cc
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@@ -427,11 +427,19 @@ void KeyEncoder::EncoderInteger::Decode(uint32_t
start_row, uint32_t num_rows,
row_base += offset_within_row;
uint8_t* col_base = col_prep.mutable_data(1);
switch (col_prep.metadata().fixed_length) {
- case 1:
+ case 1: {
for (uint32_t i = 0; i < num_rows; ++i) {
col_base[i] = row_base[i * row_size];
}
+ // For booleans, we pack 8 bytes at a time, and the buffer we're
+ // writing to here may not be fully initialized - so make sure a
+ // multiple of 8 bytes are initialized to avoid Valgrind errors. The
+ // temp buffer is sized to num_rows uint32_t values, so there's more
+ // than enough space here.
Review comment:
I wonder if it wouldn't be easier to just always zero-initialize the 8
last bytes in the temp buffer?
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