Function GetDigitFromString

be/src/exprs/mask-functions-ir.cc:432–442

Get digit (masked_number) from StringVal. Only accept digits or -1.

/// Get digit (masked_number) from StringVal. Only accept digits or -1.
static inline bool GetDigitFromString(FunctionContext* ctx, const StringVal& str,
    int* res) {
  if (str.len != 1 || str.ptr[0] < '0' || str.ptr[0] > '9') {
    ctx->SetError(Substitute(
        "Can't convert '$0' to a valid masked_number. Valid values: 0-9.",
        AnyValUtil::ToString(str)).c_str());
    return false;
  }
  *res = str.ptr[0] - '0';
  return true;
}

/// MaskShowFirstN overloads for string value
StringVal MaskFunctions::MaskShowFirstN(FunctionContext* ctx, const StringVal& val) {