Support typed prepared statements
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Start by reproducing the prepared-statement examples in PostgreSQL through asyncpg and inspect how parameter types are handled. Done means the reported SUM(text) failure is addressed by supporting typed prepared statements or a way for callers to specify parameter types, with coverage for the shown query.
Written by the indexing model from the issue text.
Description
While datatypes are optional in prepared statements, not using them can results in type errors such as
function sum(text) does not exist
This is easily reproducible in any PSQL client
PREPARE my_query AS
SELECT SUM(CASE WHEN v = 'A' THEN $1 ELSE $2 END)
FROM (VALUES ('A'), ('B')) as q0(v);
-- ERROR: function sum(text) does not exist
But when I specify the types, it works
PREPARE my_query(int, int) AS
SELECT SUM(CASE WHEN v = 'A' THEN $1 ELSE $2 END)
FROM (VALUES ('A'), ('B')) as q0(v);
EXECUTE my_query(1,0);
-- 1
DEALLOCATE my_query;
asyncpg currently does not include types, which causes me to run into the sum(text) error. I'd expect it to either include types, or allow me to specify the types somehow.
Workaround:
Include a cast expression.
i.e.: $1::int or CAST($1 AS INT)
Full example
PREPARE my_query AS
SELECT SUM(CASE WHEN v = 'A' THEN $1::int ELSE $2::int END)
FROM (VALUES ('A'), ('B')) as q0(v);
- Dominant language
- Python
- Stars
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- Forks
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- Avg merge
- 2d 20h
- Merged PRs (30d)
- 9
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