GoGoWen commented on code in PR #19413:
URL: https://github.com/apache/doris/pull/19413#discussion_r1197494256
##########
be/src/vec/data_types/data_type_hll.cpp:
##########
@@ -126,4 +126,30 @@ void DataTypeHLL::to_string(const class
doris::vectorized::IColumn& column, size
ostr.write(result.c_str(), result.size());
}
+std::string DataTypeHLL::to_string(const IColumn& column, size_t row_num)
const {
+ auto col_row = check_column_const_set_readability(column, row_num);
+ ColumnPtr ptr = col_row.first;
+ row_num = col_row.second;
+
+ auto& data = const_cast<HyperLogLog&>(assert_cast<const
ColumnHLL&>(*ptr).get_element(row_num));
+
+ std::string result(data.max_serialized_size(), '0');
+ data.serialize((uint8_t*)result.data());
+ return result;
+}
+
+Status DataTypeHLL::from_string(ReadBuffer& rb, IColumn* column) const {
+ auto& data_column = assert_cast<ColumnHLL&>(*column);
+ auto& data = data_column.get_data();
+
+ std::string str;
+ str = rb.to_string();
+ HyperLogLog hll;
+ if (!hll.deserialize(Slice(str))) {
+ LOG(WARNING) << "deserialize hll from string fail!";
Review Comment:
in previous design, if some error hll row deserialize fail can not effect
other correct hll. And now seems we make it fail fast should be better.
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