[NSE-217] fix missing decimal check

native-sql-engine/cpp/src/codegen/arrow_compute/ext/codegen_node_visitor.cc

@@ -298,13 +298,50 @@ arrow::Status CodeGenNodeVisitor::Visit(const gandiva::FunctionNode& node) {
         RETURN_NOT_OK(AppendProjectList(child_visitor_list, i));
       }
       codes_str_ = ss.str();
-    } else if (func_name.find("cast") != std::string::npos) {
+    } else if (func_name.find("cast") != std::string::npos &&
+               func_name.compare("castDATE") != 0 &&
+               func_name.compare("castDECIMAL") != 0 &&
+               func_name.compare("castDECIMALNullOnOverflow") != 0) {
       ss << child_visitor_list[0]->GetResult();
       check_str_ = child_visitor_list[0]->GetPreCheck();
       for (int i = 0; i < 1; i++) {
         RETURN_NOT_OK(AppendProjectList(child_visitor_list, i));
       }
       codes_str_ = ss.str();
+    } else if (func_name.compare("castDECIMAL") == 0) {
+      codes_str_ = func_name + "_" + std::to_string(cur_func_id);
+      auto validity = codes_str_ + "_validity";
+      std::stringstream fix_ss;
+      auto decimal_type =
+          std::dynamic_pointer_cast<arrow::Decimal128Type>(node.return_type());
+      auto childNode = node.children().at(0);
+      if (childNode->return_type()->id() != arrow::Type::DECIMAL) {
+        // if not casting from Decimal
+        fix_ss << ", " << decimal_type->precision() << ", " << decimal_type->scale();
+      } else {
+        // if casting from Decimal
+        auto childType =
+            std::dynamic_pointer_cast<arrow::Decimal128Type>(childNode->return_type());
+        fix_ss << ", " << childType->precision() << ", " << childType->scale() << ", "
+               << decimal_type->precision() << ", " << decimal_type->scale();
+      }
+      std::stringstream prepare_ss;
+      prepare_ss << GetCTypeString(node.return_type()) << " " << codes_str_ << ";"
+                 << std::endl;
+      prepare_ss << "bool " << validity << " = " << child_visitor_list[0]->GetPreCheck()
+                 << ";" << std::endl;
+      prepare_ss << "if (" << validity << ") {" << std::endl;
+      prepare_ss << codes_str_ << " = " << func_name << "("
+                 << child_visitor_list[0]->GetResult() << fix_ss.str() << ");"
+                 << std::endl;
+      prepare_ss << "}" << std::endl;
+
+      for (int i = 0; i < 1; i++) {
+        prepare_str_ += child_visitor_list[i]->GetPrepare();
+      }
+      prepare_str_ += prepare_ss.str();
+      check_str_ = validity;
+
     } else if (func_name.compare("add") == 0) {
       codes_str_ = "add_" + std::to_string(cur_func_id);
       auto validity = "add_validity_" + std::to_string(cur_func_id);