Re: information_schema.view attgenerated

On Wed, Sep 18, 2024 at 4:09 PM Peter Eisentraut <peter(at)eisentraut(dot)org> wrote:
>
> >
> > i guess, it will have some minor speed up, also more accurate.
>
> I'm having a hard time interpreting this report. Could you be more
> clear about what is the existing code, and what is the code you are
> proposing as new.?
>

sorry for confusion. The changes I propose, also attached.

diff --git a/src/backend/catalog/information_schema.sql
b/src/backend/catalog/information_schema.sql
index c4145131ce..ff8b9305e4 100644
--- a/src/backend/catalog/information_schema.sql
+++ b/src/backend/catalog/information_schema.sql
@@ -688,7 +688,7 @@ CREATE VIEW columns AS
CAST(c.relname AS sql_identifier) AS table_name,
CAST(a.attname AS sql_identifier) AS column_name,
CAST(a.attnum AS cardinal_number) AS ordinal_position,
- CAST(CASE WHEN a.attgenerated = '' THEN
pg_get_expr(ad.adbin, ad.adrelid) END AS character_data) AS
column_default,
+ CAST(CASE WHEN a.attgenerated = '' AND a.atthasdef THEN
pg_get_expr(ad.adbin, ad.adrelid) END AS character_data) AS
column_default,
CAST(CASE WHEN a.attnotnull OR (t.typtype = 'd' AND
t.typnotnull) THEN 'NO' ELSE 'YES' END
AS yes_or_no)
AS is_nullable,
@@ -777,8 +777,8 @@ CREATE VIEW columns AS
CAST(seq.seqmin AS character_data) AS identity_minimum,
CAST(CASE WHEN seq.seqcycle THEN 'YES' ELSE 'NO' END AS
yes_or_no) AS identity_cycle,

- CAST(CASE WHEN a.attgenerated <> '' THEN 'ALWAYS' ELSE
'NEVER' END AS character_data) AS is_generated,
- CAST(CASE WHEN a.attgenerated <> '' THEN
pg_get_expr(ad.adbin, ad.adrelid) END AS character_data) AS
generation_expression,
+ CAST(CASE WHEN a.attgenerated <> '' AND a.atthasdef THEN
'ALWAYS' ELSE 'NEVER' END AS character_data) AS is_generated,
+ CAST(CASE WHEN a.attgenerated <> '' AND a.atthasdef THEN
pg_get_expr(ad.adbin, ad.adrelid) END AS character_data) AS
generation_expression,