Re: sql wrapped plpgsql set returning function

I narrowed it down further. Can someone explain the difference between
passing array[...] and passing an array using an aggregate array
function into the function?

On Wed, 2007-04-25 at 14:45 -0400, Richard Albright wrote:
> It turns out that the from subselect is causing the error in :
>
> select getmovavg(aggarray(trade_date), aggarray(close_price),
> > '2004-01-20', 5)
> > from
> > ( select trade_date, close_price::numeric
> > from quotedata
> > where symbol='MSFT'
> > and trade_date > '2004-01-01'
> > order by trade_date desc) values
>
> whereas
>
> select * from getmovavg(array['2007-04-03', '2007-04-02',
> '2007-04-01']::timestamp[], array[4.0,3.0,2.0]::numeric[], '2007-04-03',
> 3)
>
> will work. anyone know why that would be?
>
> On Wed, 2007-04-25 at 14:10 -0400, Richard Albright wrote:
> > I have figured out my looping issue, but am having difficulty wrapping
> > my set returning plpgsql function getmovavgset with a getmovavg sql func
> > when i run the following:
> >
> > select getmovavg(aggarray(trade_date), aggarray(close_price),
> > '2004-01-20', 5)
> > from
> > ( select trade_date, close_price::numeric
> > from quotedata
> > where symbol='MSFT'
> > and trade_date > '2004-01-01'
> > order by trade_date desc) values
> >
> > i get the following output:
> >
> > NOTICE: v_rec: ("2004-01-20 00:00:00",27.6916666666666667)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-16 00:00:00",27.6183333333333333)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-15 00:00:00",27.6766666666666667)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-14 00:00:00",27.7883333333333333)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-13 00:00:00",27.8783333333333333)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-12 00:00:00",27.9966666666666667)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-09 00:00:00",27.9766666666666667)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-08 00:00:00",28.0400000000000000)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-07 00:00:00",28.0100000000000000)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-06 00:00:00",27.9433333333333333)
> > CONTEXT: SQL function "getmovavg" statement 1
> > NOTICE: v_rec: ("2004-01-05 00:00:00",27.7950000000000000)
> > CONTEXT: SQL function "getmovavg" statement 1
> >
> > ERROR: set-valued function called in context that cannot accept a set
> >
> > I am having difficulty determining if the error is in my getmovavgset or
> > getmovavg function.
> > the notice msgs are coming from the getmovavgset func, so it is
> > iterating. I just dont know if the syntax is correct for the
> > generate_series statement in that func. What am I missing? code is
> > below.
> >
> > CREATE TYPE resultset AS
> > ("index" timestamp[],
> > "values" numeric[]);
> >
> > CREATE TYPE resultsetitem AS
> > ("index" timestamp,
> > value numeric);
> >
> > CREATE AGGREGATE aggarray(
> > BASETYPE=anyelement,
> > SFUNC=array_append,
> > STYPE=anyarray,
> > INITCOND='{}'
> > );
> >
> > CREATE OR REPLACE FUNCTION getmovavgarray(p_idxarray _timestamp,
> > p_valarray _numeric, p_idx "timestamp", p_periods int8)
> > RETURNS resultset AS
> > $BODY$
> > declare
> > idxptr int8;
> > idxendptr int8;
> > offsetptr int8;
> > begoffset int8;
> > ar_idx timestamp[]:='{}';
> > ar_values numeric[]:='{}';
> > v_rec resultset%rowtype;
> > v_rtn resultset%rowtype;
> > v_sql text;
> > v_index timestamp;
> > v_value numeric;
> > v_idx timestamp;
> > begin
> > for offsetptr in 1 .. array_upper(p_idxarray, 1)
> > loop
> > --raise notice 'offset: %', offsetptr;
> > begoffset := offsetptr;
> > exit when p_idxarray[offsetptr]::timestamp <= p_idx;
> > end loop;
> > --raise notice 'offset: %, end: %', begoffset, array_upper(p_idxarray,
> > 1);
> > for idxptr in 1 .. (array_upper(p_idxarray, 1) - begoffset)
> > loop
> > idxendptr := idxptr + p_periods;
> > v_index := p_idxarray[(idxptr + begoffset - 1)];
> > v_value := movavg(p_valarray[ (idxptr + begoffset - 1) : (idxendptr +
> > begoffset -1) ]);
> > ar_idx := array_append(ar_idx, v_index);
> > ar_values := array_append(ar_values, v_value);
> > --raise notice 'idx: %, avg: %', v_index, v_value;
> > end loop;
> > v_rtn := (ar_idx, ar_values);
> > return v_rtn;
> >
> >
> > end
> > $BODY$
> > LANGUAGE 'plpgsql' VOLATILE;
> >
> > CREATE OR REPLACE FUNCTION getmovavgset(p_idxarray _timestamp,
> > p_valarray _numeric, p_idx "timestamp", p_periods int8)
> > RETURNS SETOF resultsetitem AS
> > $BODY$
> > declare
> > results resultset;
> > v_rec record;
> > v_rtn resultsetitem%rowtype;
> > v_sql text;
> > ar_idx timestamp[];
> > ar_values numeric[];
> > begin
> > --raise notice 'idxarray: %', p_idxarray;
> > for results in
> > select * from getmovavgarray(p_idxarray, p_valarray, p_idx, p_periods)
> > loop
> > ar_idx := results.index;
> > ar_values := results.values;
> > end loop;
> > for v_rec in
> > select (ar_idx)[s] as index, (ar_values)[s] as value from
> > generate_series(1, array_upper(ar_idx, 1)) as s
> > loop
> > raise notice 'v_rec: %', v_rec;
> > v_rtn := (v_rec.index, v_rec.value);
> > --raise notice 'resultset: %', v_rtn;
> > return next v_rtn;
> > end loop;
> > end
> > $BODY$
> > LANGUAGE 'plpgsql' VOLATILE;
> >
> > CREATE OR REPLACE FUNCTION getmovavg(p_idxarray _timestamp, p_valarray
> > _numeric, p_idx "timestamp", p_periods int8)
> > RETURNS SETOF resultsetitem as
> > $BODY$
> > select * from getmovavgset($1, $2, $3, $4);
> > $BODY$
> > LANGUAGE 'sql' volatile;
--
Rick Albright
Senior Quantitative Analyst
Indie Research, LLC
254 Witherspoon Street
Princeton, NJ 08542
(609)497-1030
ralbright(at)insiderscore(dot)com