zenoyang commented on code in PR #9586:
URL: https://github.com/apache/incubator-doris/pull/9586#discussion_r873475614
##########
be/src/vec/columns/column_dictionary.h:
##########
@@ -98,12 +98,14 @@ class ColumnDictionary final : public COWHelper<IColumn,
ColumnDictionary<T>> {
}
void insert_data(const char* pos, size_t /*length*/) override {
- _codes.push_back(unaligned_load<T>(pos));
+ if (pos == nullptr) {
+ _codes.push_back(_dict.get_null_code());
+ return;
+ }
+ LOG(FATAL) << "insert_data not supported in ColumnDictionary";
Review Comment:
done
##########
be/src/vec/columns/column_dictionary.h:
##########
@@ -98,12 +98,14 @@ class ColumnDictionary final : public COWHelper<IColumn,
ColumnDictionary<T>> {
}
void insert_data(const char* pos, size_t /*length*/) override {
- _codes.push_back(unaligned_load<T>(pos));
+ if (pos == nullptr) {
Review Comment:
This function in ColumnDict is not actually called. This is just to limit
handling only null.
##########
be/src/vec/columns/column_dictionary.h:
##########
@@ -304,10 +310,14 @@ class ColumnDictionary final : public COWHelper<IColumn,
ColumnDictionary<T>> {
return -1;
}
+ T get_null_code() {
+ return _dict_data.size() - 1; // The last dict value is null value
+ }
Review Comment:
No problem, if there is null, the predicate evaluates to: `bool ret =
!null_bitmap[idx] && (cell_value OP dict_code);`
`null_bitmap` will filter out null.
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