Method AddSubWeeks

be/src/exprs/date-functions-ir.cc:248–261

template <bool is_add, typename AnyIntVal>
DateVal DateFunctions::AddSubWeeks(FunctionContext* context, const DateVal& d_val,
    const AnyIntVal& num_weeks) {
  if (d_val.is_null || num_weeks.is_null) return DateVal::null();

  // Sanity check: make sure that the number of weeks converted to days fits into 64-bits.
  int64_t weeks = is_add ? num_weeks.val : -num_weeks.val;
  if (weeks > numeric_limits<int64_t>::max() / 7
      || weeks < numeric_limits<int64_t>::min() / 7) {
    return DateVal::null();
  }

  const DateValue dv = DateValue::FromDateVal(d_val).AddDays(weeks * 7);
  return dv.ToDateVal();
}

// Explicit template instantiation is required for proper linking. These functions
// are only indirectly called via a function pointer provided by the opcode registry