yiguolei commented on code in PR #23759:
URL: https://github.com/apache/doris/pull/23759#discussion_r1312852685
##########
be/src/vec/functions/function_bitmap.cpp:
##########
@@ -887,6 +942,40 @@ struct BitmapToString {
}
};
+struct NameBitmapToBase64 {
+ static constexpr auto name = "bitmap_to_base64";
+};
+
+struct BitmapToBase64 {
+ using ReturnType = DataTypeString;
+ static constexpr auto TYPE_INDEX = TypeIndex::BitMap;
+ using Type = DataTypeBitMap::FieldType;
+ using ReturnColumnType = ColumnString;
+ using Chars = ColumnString::Chars;
+ using Offsets = ColumnString::Offsets;
+
+ static Status vector(const std::vector<BitmapValue>& data, Chars& chars,
Offsets& offsets) {
+ size_t size = data.size();
+ offsets.resize(size);
+ chars.reserve(size);
+ for (size_t i = 0; i < size; ++i) {
+ BitmapValue& bitmap_val = const_cast<BitmapValue&>(data[i]);
+ auto ser_size = bitmap_val.getSizeInBytes();
+ char ser_buff[ser_size];
+ bitmap_val.write_to(ser_buff);
+
+ int encoded_size = (int)(4.0 * ceil((double)ser_size / 3.0));
+ char dst[encoded_size];
+ memset(dst, 0, encoded_size);
+ int outlen =
+ base64_encode((const unsigned char*)ser_buff, ser_size,
(unsigned char*)dst);
+ DCHECK(outlen > 0);
+ StringOP::push_value_string(std::string_view(dst, outlen), i,
chars, offsets);
Review Comment:
IF the output string will copy the column, then we could reuse the buffer.
And realloc a new buffer if it size is less than needed.
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