Method MurmurHashDecimal

be/src/exprs/utility-functions-ir.cc:116–124

Note that this only hashes the unscaled value and not the scale or precision, so this function is only valid when used over a single decimal type.

// Note that this only hashes the unscaled value and not the scale or precision, so this
// function is only valid when used over a single decimal type.
BigIntVal UtilityFunctions::MurmurHashDecimal(FunctionContext* ctx,
    const DecimalVal& input_val) {
  if (input_val.is_null) return BigIntVal::null();
  const FunctionContext::TypeDesc& input_type = *ctx->GetArgType(0);
  int byte_size = ColumnType::GetDecimalByteSize(input_type.precision);
  // val4, val8 and val16 all start at the same memory address.
  return BigIntVal(HashUtil::MurmurHash2_64(&input_val.val16, byte_size,
        HashUtil::MURMUR_DEFAULT_SEED));
}

template BigIntVal UtilityFunctions::MurmurHash(
    FunctionContext* ctx, const BooleanVal& input_val);