RkGrit commented on code in PR #110:
URL: https://github.com/apache/tsfile/pull/110#discussion_r1650279307
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cpp/src/encoding/bitpack_encoder.h:
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@@ -167,6 +165,24 @@ class BitPackEncoder {
bytes_buffer_.clear();
bitpacked_group_count_ = 0;
}
+
+ int get_max_byte_size() {
+ if (values_.empty()) {
+ return 0;
+ }
+ int maxBitWidth = get_int_max_bit_width(values_);
+ int totalValues = values_.size();
+ int fullGroups = totalValues / 8;
+ int remainingValues = totalValues % 8;
+ int bytesPerGroup = (maxBitWidth * 8 + 7) / 8;
+ int maxSize = 0;
+ maxSize += fullGroups * bytesPerGroup;
+ if (remainingValues > 0) {
+ maxSize += bytesPerGroup;
+ }
+ maxSize += fullGroups * (1 + 1) + (remainingValues > 0 ? (1 + 1) : 0);
Review Comment:
"1+1" means each bitpack group has a header of 1 byte and a tail of 1 byte
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