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Make use of LATERAL in information_schema.sequences view.

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It said "XXX: The following could be improved if we had LATERAL" ...
so let's do that.

No catversion bump since either version of the view works fine.
This commit is contained in:
Tom Lane 2012-08-18 16:14:57 -04:00
parent 084a29c94f
commit c246eb5aaf
1 changed files with 6 additions and 7 deletions
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13
src/backend/catalog/information_schema.sql
View File

@ -1521,13 +1521,12 @@ CREATE VIEW sequences AS
CAST(64 AS cardinal_number) AS numeric_precision,
CAST(2 AS cardinal_number) AS numeric_precision_radix,
CAST(0 AS cardinal_number) AS numeric_scale,
-- XXX: The following could be improved if we had LATERAL.
CAST((pg_sequence_parameters(c.oid)).start_value AS character_data) AS start_value,
CAST((pg_sequence_parameters(c.oid)).minimum_value AS character_data) AS minimum_value,
CAST((pg_sequence_parameters(c.oid)).maximum_value AS character_data) AS maximum_value,
CAST((pg_sequence_parameters(c.oid)).increment AS character_data) AS increment,
CAST(CASE WHEN (pg_sequence_parameters(c.oid)).cycle_option THEN 'YES' ELSE 'NO' END AS yes_or_no) AS cycle_option
FROM pg_namespace nc, pg_class c
CAST(p.start_value AS character_data) AS start_value,
CAST(p.minimum_value AS character_data) AS minimum_value,
CAST(p.maximum_value AS character_data) AS maximum_value,
CAST(p.increment AS character_data) AS increment,
CAST(CASE WHEN p.cycle_option THEN 'YES' ELSE 'NO' END AS yes_or_no) AS cycle_option
FROM pg_namespace nc, pg_class c, LATERAL pg_sequence_parameters(c.oid) p
WHERE c.relnamespace = nc.oid
AND c.relkind = 'S'
AND (NOT pg_is_other_temp_schema(nc.oid))