Re: BUG #16549: "CASE" not work properly , the function works properly on PostgreSQL 9.6.8
| От | Pavel Stehule |
|---|---|
| Тема | Re: BUG #16549: "CASE" not work properly , the function works properly on PostgreSQL 9.6.8 |
| Дата | |
| Msg-id | CAFj8pRAyxTr1m-Azy7Ear6G9DgRHFsmpnoaAV2mQ2iecDbyZXg@mail.gmail.com обсуждение исходный текст |
| Ответ на | BUG #16549: "CASE" not work properly , the function works properly on PostgreSQL 9.6.8 (PG Bug reporting form <noreply@postgresql.org>) |
| Ответы |
Re: BUG #16549: "CASE" not work properly , the function works properly on PostgreSQL 9.6.8
(Tom Lane <tgl@sss.pgh.pa.us>)
|
| Список | pgsql-bugs |
út 21. 7. 2020 v 16:56 odesílatel PG Bug reporting form <noreply@postgresql.org> napsal:
The following bug has been logged on the website:
Bug reference: 16549
Logged by: Sławomir Nowakiewicz
Email address: slawomir.nowakiewicz@rubix.com
PostgreSQL version: 12.1
Operating system: Linux
Description:
"CASE" try to cast a string to integer when a condition is not met. I
checked this function also on PostgreSQL 11.2 - the result is the same.
BEGIN;
CREATE TABLE public.temp_data_type
(
data_type_name text NOT NULL,
data_type_storage_type text NOT NULL DEFAULT ''::text
);
INSERT INTO public.temp_data_type
VALUES
('INTEGER','int'),
('LOOKUP_TABLE','string');
CREATE OR REPLACE FUNCTION public.temp_item_attribute_create(p_datatype
text, p_values text[])
RETURNS integer
LANGUAGE 'plpgsql'
VOLATILE
AS $BODY$
DECLARE
value_int integer;
i integer;
BEGIN
i:=1;
--RAISE NOTICE 'datatype: %', p_datatype;
--RAISE NOTICE 'attribute.values[i]: %',p_values[i];
value_int := CASE WHEN p_datatype::TEXT IN (SELECT data_type_name FROM
temp_data_type WHERE data_type_storage_type = 'int') THEN
p_values[i]::INTEGER
ELSE
NULL::INTEGER
END;
RETURN value_int;
END;
$BODY$;
ALTER FUNCTION public.temp_item_attribute_create(text,text[])
OWNER TO postgres;
SELECT temp_item_attribute_create('LOOKUP_TABLE','{SHELL}');
--ROLLBACK;
ERROR: 22P02: invalid input syntax for type integer: "SHELL"
CONTEXT: SQL statement "SELECT CASE WHEN p_datatype::TEXT IN (SELECT
data_type_name FROM temp_data_type WHERE data_type_storage_type = 'int')
THEN
p_values[i]::INTEGER
ELSE
NULL::INTEGER
END"
PL/pgSQL function temp_item_attribute_create(text,text[]) line 10 at
assignment
LOCATION: pg_strtoint32, numutils.c:259
I reduced this problem to simple DO script
do $$
declare
varv text = 'hello';
varc text = 'xxx';
begin
raise notice '%', case when 'int' = varc then varv::int else null end;
end;
$$;
NOTICE: <NULL>
DO
declare
varv text = 'hello';
varc text = 'xxx';
begin
raise notice '%', case when 'int' = varc then varv::int else null end;
end;
$$;
NOTICE: <NULL>
DO
But with small change
postgres=# do $$
declare
varv text = 'hello';
varc text = 'xxx';
begin
raise notice '%', case when 'int' = (select varc) then varv::int else null end;
end;
$$;
ERROR: invalid input syntax for type integer: "hello"
CONTEXT: SQL statement "SELECT case when 'int' = (select varc) then varv::int else null end"
PL/pgSQL function inline_code_block line 6 at RAISE
declare
varv text = 'hello';
varc text = 'xxx';
begin
raise notice '%', case when 'int' = (select varc) then varv::int else null end;
end;
$$;
ERROR: invalid input syntax for type integer: "hello"
CONTEXT: SQL statement "SELECT case when 'int' = (select varc) then varv::int else null end"
PL/pgSQL function inline_code_block line 6 at RAISE
What is interesting - it fails only when the subquery is in CASE condition expression. If is somewhere else, then it doesn't fail
Regards
Pavel
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