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Add error_on_null(), checking if the input is the null value

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This polymorphic function produces an error if the input value is
detected as being the null value; otherwise it returns the input value
unchanged.

This function can for example become handy in SQL function bodies, to
enforce that exactly one row was returned.

Author: Joel Jacobson <joel@compiler.org>
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/ece8c6d1-2ab1-45d5-ba12-8dec96fc8886@app.fastmail.com
Discussion: https://postgr.es/m/de94808d-ed58-4536-9e28-e79b09a534c7@app.fastmail.com
This commit is contained in:
Michael Paquier
2025-10-22 09:55:17 +09:00
parent 2470ca435c
commit 2b75c38b70
5 changed files with 81 additions and 0 deletions
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14
src/backend/utils/adt/misc.c
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@@ -186,6 +186,20 @@ pg_num_nonnulls(PG_FUNCTION_ARGS)
PG_RETURN_INT32(nargs - nulls);
}
/*
* error_on_null()
* Check if the input is the NULL value
*/
Datum
pg_error_on_null(PG_FUNCTION_ARGS)
{
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("null value not allowed")));
PG_RETURN_DATUM(PG_GETARG_DATUM(0));
}
/*
* current_database()