topic Re: Why is FedSql ineffective with dates? in SAS Programming

Why is FedSql ineffective with dates?

PaalNavestad — Tue, 30 Mar 2021 07:32:45 GMT

Hi. I am working with FEDSQL and date. I have a table of approx. 40 million rows where I want to do the following. If I run this without the and date >= date'2021-04-01' then it runs between 2.5 and 3 seconds (resultset is approx 650k rows). If I add the and date >= date'2021-04-01' the same query runs in just over 25 seconds. giving a slightly smaller result set. If i run with out the date filter and does the subset for the in a separate sas data step the subsequent datastep runs in apprx. 0.4 seconds.

I created a track. Number is

7613313278

Do i do something wrong? Can anybody please explain why?

proc fedsql sessref=casauto;
drop table casuser.WellProfileDays force;

create table casuser.WellProfileDays
as select

wellbore,
date,
Plant_cd,
Complex_cd,
Facility_nm,
bucket,
min(oil) as oil,
min(gas) as gas,
min(BOE) as boe
from std_production.STF_all_details_hist

where stf_case=&stf_case
and date >= date'2021-04-01'


group by
wellbore,
date,
Plant_cd,
Complex_cd,
Facility_nm,
bucket;

quit;

Re: Why is FedSql ineffective with dates?

ChrisNZ — Mon, 29 Mar 2021 06:59:58 GMT

That an interesting question.

Please format your code by pasting it using the appropriate icon.

Re: Why is FedSql ineffective with dates?

Kurt_Bremser — Mon, 29 Mar 2021 08:26:44 GMT

Can you use

'01apr2021'd

instead of the typecast?

Re: Why is FedSql ineffective with dates?

qoit — Mon, 29 Mar 2021 08:31:05 GMT

If it's just about the dates, FEDSQL, unlike PROC SQL, accepts all ANSI compliant datatypes, and therefore is processing all DOUBLE data type SAS dates against the FEDSQL date constant. It could be that SAS is converting the RHS equation date'2021-04-01' into DOUBLE data type to process each observation, and thereby pushing both CPU and Real time.

Re: Why is FedSql ineffective with dates?

PaalNavestad — Mon, 29 Mar 2021 08:59:19 GMT

No, FEDSQL does not recognize that.

Re: Why is FedSql ineffective with dates?

PaalNavestad — Mon, 29 Mar 2021 09:02:24 GMT

Thanks, I thought about something like that. I used the numeric date but then I got another fault around comparing to integer.

Re: Why is FedSql ineffective with dates?

Kurt_Bremser — Mon, 29 Mar 2021 09:45:31 GMT

Next I would try to create a numeric literal:

%let cutoff=%sysfunc(inputn(2021-04-01,yymmdd10.));

and later

where stf_case=&stf_case
and date >= &cutoff

as I hope that dates in CAS are still counts of days from 1960-01-01.

Re: Why is FedSql ineffective with dates?

Kurt_Bremser — Mon, 29 Mar 2021 09:51:15 GMT

@PaalNavestad wrote:

Thanks, I thought about something like that. I used the numeric date but then I got another fault around comparing to integer.

Please share the exact code you used.

Re: Why is FedSql ineffective with dates?

SASKiwi — Mon, 29 Mar 2021 20:01:39 GMT

Looks like you are using a CAS library in Viya - what version are you using? Viya is evolving rapidly so you might find later versions perform better.

I suggest you open a Tech Support track on your findings and post the reply back here.

Re: Why is FedSql ineffective with dates?

ChrisNZ — Tue, 30 Mar 2021 04:09:34 GMT

If you can't get an answer here, please contact SAS tech support.

And do let us know about the outcome. I am most curious.

Re: Why is FedSql ineffective with dates?

PaalNavestad — Tue, 30 Mar 2021 06:27:35 GMT

Hi Kurt,

this is the code I used

%let stf_case = '2+10_21';
%let FcstStart= '01mar2021'd;

data _null_;
	cutoff = &fcststart;
	call symput('cutoff',cutoff);
run;
This give

%put cutoff=&cutoff;

cutoff= 22340

However when running this is FEDSQL

seleect etc.

from std_production.STF_all_details_hist

where stf_case=&stf_case
and date >= &cutoff

I get

WARNING: Unable to choose a best candidate operator. You might need to add explicit typecasts.

ERROR: Operator is not unique: DATE >= INTEGER

ERROR: The action stopped due to errors.

ERROR: The FedSQL action was not successful

There is something in the syntax I do not understand.

But the real challenge is why when entering dateconstants as the system expect it there is a much larger run time.

Re: Why is FedSql ineffective with dates?

PaalNavestad — Tue, 30 Mar 2021 06:28:17 GMT

Hi Chris, yes I will create a track

Re: Why is FedSql ineffective with dates?

Kurt_Bremser — Tue, 30 Mar 2021 07:00:17 GMT

So fedsql makes a difference between dates and numbers, something completely different from Base SAS.

Let's see what the TS track reveals.

Re: Why is FedSql ineffective with dates?

PaalNavestad — Tue, 27 Apr 2021 07:54:46 GMT

Hi all, this is now a verified bug with SAS and will according to SAS most probable be fixed in the next release.

Re: Why is FedSql ineffective with dates?

ChrisNZ — Tue, 27 Apr 2021 08:38:52 GMT

Good on you for reporting it.