HappenLee commented on code in PR #40670:
URL: https://github.com/apache/doris/pull/40670#discussion_r1758093599
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be/src/vec/functions/function_string.h:
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@@ -1017,6 +1022,34 @@ class FunctionStringConcat : public IFunction {
return std::make_shared<DataTypeString>();
}
+ Status open(FunctionContext* context, FunctionContext::FunctionStateScope
scope) override {
+ if (scope == FunctionContext::THREAD_LOCAL) {
+ return Status::OK();
+ }
+ std::shared_ptr<ConcatState> state = std::make_shared<ConcatState>();
+
+ context->set_function_state(scope, state);
+
+ state->use_state = true;
+
+ // Optimize function calls like this:
+ // concat(col, "123", "abc", "456") -> tail = "123abc456"
+ for (size_t i = 1; i < context->get_num_args(); i++) {
+ const auto* column_string = context->get_constant_col(i);
+ if (column_string == nullptr) {
+ state->use_state = false;
+ break;
+ }
+ auto string_vale = column_string->column_ptr->get_data_at(0);
Review Comment:
Check here is NULL const， what happen
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