Обсуждение: pgsql: Add error_on_null(), checking if the input is the null value
Add error_on_null(), checking if the input is the null value 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 Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/2b75c38b707a070922231de667a0bd08ee71b268 Modified Files -------------- doc/src/sgml/func/func-comparison.sgml | 22 ++++++++++++++++++++ src/backend/utils/adt/misc.c | 14 +++++++++++++ src/include/catalog/pg_proc.dat | 3 +++ src/test/regress/expected/misc_functions.out | 31 ++++++++++++++++++++++++++++ src/test/regress/sql/misc_functions.sql | 11 ++++++++++ 5 files changed, 81 insertions(+)