diff options
| author | Bruce Momjian <bruce@momjian.us> | 2025-04-07 21:33:42 -0400 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2025-04-07 21:33:42 -0400 |
| commit | 46b4ba533cee9f64a60714d91607e74362abf67f (patch) | |
| tree | da20e7e5a7fa827c9488d57ad51fc837f21032a9 /doc/src | |
| parent | 039549d70f6aa2daa3714a13752a08fa8ca2fb05 (diff) | |
| download | postgresql-46b4ba533cee9f64a60714d91607e74362abf67f.tar.gz postgresql-46b4ba533cee9f64a60714d91607e74362abf67f.zip | |
Fix PG 17 [NOT] NULL optimization bug for domains
A PG 17 optimization allowed columns with NOT NULL constraints to skip
table scans for IS NULL queries, and to skip IS NOT NULL checks for IS
NOT NULL queries. This didn't work for domain types, since domain types
don't follow the IS NULL/IS NOT NULL constraint logic. To fix, disable
this optimization for domains for PG 17+.
Reported-by: Jan Behrens
Diagnosed-by: Tom Lane
Discussion: https://postgr.es/m/Z37p0paENWWUarj-@momjian.us
Backpatch-through: 17
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/create_domain.sgml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/src/sgml/ref/create_domain.sgml b/doc/src/sgml/ref/create_domain.sgml index ce555203486..c111285a69c 100644 --- a/doc/src/sgml/ref/create_domain.sgml +++ b/doc/src/sgml/ref/create_domain.sgml @@ -283,7 +283,8 @@ CREATE TABLE us_snail_addy ( <para> The syntax <literal>NOT NULL</literal> in this command is a <productname>PostgreSQL</productname> extension. (A standard-conforming - way to write the same would be <literal>CHECK (VALUE IS NOT + way to write the same for non-composite data types would be + <literal>CHECK (VALUE IS NOT NULL)</literal>. However, per <xref linkend="sql-createdomain-notes"/>, such constraints are best avoided in practice anyway.) The <literal>NULL</literal> <quote>constraint</quote> is a |