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 <[email protected]> Reviewed-by: Vik Fearing <[email protected]> Reviewed-by: Michael Paquier <[email protected]> Discussion: https://postgr.es/m/[email protected] Discussion: https://postgr.es/m/[email protected] 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(+)
