message: Fixed crash when the tag prop not exists.
diff: @@ -88,7 +88,7 @@ public:
  folly::StringPiece row,
  std::shared_ptr<const meta::SchemaProviderIf> schema);
  - static VariantType getDefaultProp(const meta::SchemaProviderIf* schema,
  + static StatusOr<VariantType> getDefaultProp(const meta::SchemaProviderIf* schema,
  const std::string& prop) {
  auto& vType = schema->getFieldType(prop);
  switch (vType.type) {
  @@ -109,8 +109,9 @@ public:
  return static_cast<std::string>("");
  }
  default:
  - LOG(FATAL) << "Unknown type: " << static_cast<int32_t>(vType.type);
  - return "";
  + auto msg = folly::sformat("Unknown type: {}", static_cast<int32_t>(vType.type));
  + LOG(ERROR) << "Unknown type: " << msg;
  + return Status::Error(msg);
  }
  }
  