tuple.isNull(colName) to test for emptiness also seems useful.
пн, 12 июл. 2021 г. в 18:20, Alexei Scherbakov :
> +1 to make some improvements here.
>
> Using Optional doesn't make sense to me because it always involves boxing
> (and we already have tuple.value(colName)).
>
> I suggest to add
+1 to make some improvements here.
Using Optional doesn't make sense to me because it always involves boxing
(and we already have tuple.value(colName)).
I suggest to add methods similar to:
tuple.doubleValue("field", double dfltValue)
which returns default value if the field is null.
ср, 7
Function basically returns two values. if value is null, it returns smth
like false, NaN, otherwise ,smth like true, 4.5. Syntax is a bit weird as
for me, but it is better than nothing.
In golang it looks like this:
if isValid, val:= getVal; isValid {
}
ср, 7 июл. 2021 г., 00:28
So what happens if the value is NULL? Exception?
-Val
On Tue, Jul 6, 2021 at 1:52 PM Ivan Daschinsky wrote:
> > Out of curiosity, what would this code do if the value is NULL? What is
> the
> type of the 'weight' variable?
>
> float of course.
>
> Out of curiosity, what would this code do if the value is NULL? What is
the
type of the 'weight' variable?
float of course.
https://www.c-sharpcorner.com/article/out-parameter-in-c-sharp-7/
вт, 6 июл. 2021 г., 22:30 Valentin Kulichenko :
> Pavel,
>
> Optionals are available in Java and we
Pavel,
Optionals are available in Java and we can use them. This is still boxing
though, and I don't know what the performance impact would be. In addition,
optional API is redundant for non-nullable fields. Perhaps, we can provide
both options (e.g. having intValue() and intValueOptional()
Ah, I see, you meant Optionals family. Yep, it is worth to think about.
вт, 6 июл. 2021 г., 10:06 Pavel Tupitsyn :
> Ivan,
>
> Nothing wrong except for performance concerns.
> The following code looks up the column by name twice:
>
> if (!tuple.isNull("weight"))
>
Ivan,
Nothing wrong except for performance concerns.
The following code looks up the column by name twice:
if (!tuple.isNull("weight"))
doSomething(tuple.floatValue("weight"))
Whereas in other languages you could do it in one shot:
if (tuple.TryGetFloatValue("weight", out var weight))
Sorry, but what is wrong with simple method isNull()
вт, 6 июл. 2021 г., 09:55 Pavel Tupitsyn :
> Val,
>
> > I don't think there is a significantly better way
> > of doing this in Java.
>
> Yep looks like there is no way to return two values without boxing.
> No ref, no out, no value types.
>
>
Val,
> I don't think there is a significantly better way
> of doing this in Java.
Yep looks like there is no way to return two values without boxing.
No ref, no out, no value types.
> Schema already provides this information, doesn't it?
It does, though we don't have an agreement on how to
Pavel,
That's a good point, but I don't think there is a significantly better way
of doing this in Java.
There should be a way to check if a field is nullable or not though. Schema
already provides this information, doesn't it?
-Val
On Mon, Jul 5, 2021 at 11:03 AM Pavel Tupitsyn wrote:
>
Igniters,
Looks like Tuple API has no efficient way to tell if a value for a nullable
column of primitive type is null.
- Tuple#intValue() will return 0 when the actual value is null => not clear
if 0 is 0 or null.
- Tuple#value() works, but is more expensive due to boxing and type lookup.
Any
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