xiaokang commented on code in PR #26749:
URL: https://github.com/apache/doris/pull/26749#discussion_r1403929052
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be/src/vec/exec/scan/new_olap_scan_node.cpp:
##########
@@ -414,6 +419,49 @@ std::string NewOlapScanNode::get_name() {
return fmt::format("VNewOlapScanNode({0})", _olap_scan_node.table_name);
}
+void NewOlapScanNode::_filter_and_collect_cast_type_for_variant(
+ const VExpr* expr,
+ phmap::flat_hash_map<std::string, std::vector<PrimitiveType>>&
colname_to_cast_types) {
+ auto* cast_expr = dynamic_cast<const VCastExpr*>(expr);
+ if (cast_expr != nullptr) {
+ auto* src_slot = cast_expr->get_child(0)->node_type() ==
TExprNodeType::SLOT_REF
+ ? dynamic_cast<const
VSlotRef*>(cast_expr->get_child(0).get())
+ : nullptr;
+ if (src_slot == nullptr) {
+ return;
+ }
+ std::vector<SlotDescriptor*> slots = _output_tuple_desc->slots();
+ SlotDescriptor* src_slot_desc =
slots[_slot_id_to_slot_idx[src_slot->slot_id()]];
+ PrimitiveType cast_dst_type =
+
cast_expr->get_target_type()->get_type_as_type_descriptor().type;
+ if (src_slot_desc->type().is_variant_type()) {
+
colname_to_cast_types[src_slot_desc->col_name()].push_back(cast_dst_type);
+ }
+ }
+ for (const auto& child : expr->children()) {
+ _filter_and_collect_cast_type_for_variant(child.get(),
colname_to_cast_types);
+ }
+}
+
+void NewOlapScanNode::get_cast_types_for_variants() {
+ phmap::flat_hash_map<std::string, std::vector<PrimitiveType>>
colname_to_cast_types;
+ for (auto it = _conjuncts.begin(); it != _conjuncts.end();) {
+ auto& conjunct = *it;
+ if (conjunct->root()) {
+ _filter_and_collect_cast_type_for_variant(conjunct->root().get(),
+ colname_to_cast_types);
+ }
+ ++it;
+ }
+ // cast to one certain type for variant could utilize fully predicates
performance
+ // when storage layer type equals to cast type
+ for (const auto& [slotid, types] : colname_to_cast_types) {
+ if (types.size() == 1) {
+ _cast_types_for_variants[slotid] = types[0];
+ }
Review Comment:
add comment
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