Hi hackers, Following earlier work to support EXCEPT for FOR ALL TABLES [1] publications, starting this thread to extend the same capability to schema-level publications (TABLES IN SCHEMA).
Currently, TABLES IN SCHEMA publishes all tables in a schema with no way to exclude a subset. Users who want to skip a few tables must switch to an explicit FOR TABLE list, which loses the convenience of schema-level publishing and requires ongoing maintenance as tables are added. Proposed syntax: ------------------------ CREATE PUBLICATION pub FOR TABLES IN SCHEMA s1 EXCEPT (s1.t1, s1.t2); ALTER PUBLICATION pub ADD TABLES IN SCHEMA s1 EXCEPT (s1.t1); ALTER PUBLICATION pub SET TABLES IN SCHEMA s1 EXCEPT (s1.t1); Note: Tables in the EXCEPT clause must be schema-qualified to avoid ambiguity and must belong to the published schema; otherwise, an error is raised. Rules and behavior: ---------------------------- 1) TABLES IN SCHEMA can be combined with FOR TABLE, but EXCEPT applies only to the schema clause and must appear immediately after it. Supported: CREATE PUBLICATION pub FOR TABLES IN SCHEMA s1 EXCEPT (s1.t1), TABLE s2.t1; CREATE PUBLICATION pub FOR TABLE s2.t1, TABLES IN SCHEMA s1 EXCEPT (s1.t1); CREATE PUBLICATION pub FOR TABLES IN SCHEMA s1 EXCEPT (s1.t1), s2 EXCEPT (s2.t1) Not supported: CREATE PUBLICATION pub FOR TABLES IN SCHEMA s1, TABLE s2.t1 EXCEPT (s1.t1); -- This same rule applies to ALTER PUBLICATION ... ADD/SET. 2) Conflicting definitions Specifying the same table both in the EXCEPT clause and explicitly in the TABLE clause results in an error, as this creates a conflicting definition for the publication. 3) "ALTER PUBLICATION ... DROP TABLES IN SCHEMA" does not support EXCEPT clause. Whereas, dropping a schema also removes any associated entries from the EXCEPT list of the publication. -- To only remove/update except list entries, use SET instead. 4) Consistency with ALL TABLES EXCEPT rules: 4a) Excluding a partitioned root excludes all its partitions 4b) Individual partitions cannot be excluded directly; exclude the root table. 4c) Excluding an inheritance parent (without ONLY) also excludes its children. The patches are divided into three parts to simplify review: Patch-001: Basic framework to support EXCEPT in CREATE PUBLICATION ... TABLES IN SCHEMA Patch-002: Extend support to ALTER PUBLICATION ... ADD TABLES IN SCHEMA Patch-003: Extend support to ALTER PUBLICATION ... SET TABLES IN SCHEMA The patches are attached, feedback and suggestions are welcome. [1] https://www.postgresql.org/message-id/CALDaNm3%3DJrucjhiiwsYQw5-PGtBHFONa6F7hhWCXMsGvh%3DtamA%40mail.gmail.com -- Thanks, Nisha
v1-0001-Support-EXCEPT-clause-for-schema-level-publicatio.patch
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v1-0002-Add-EXCEPT-support-to-ALTER-PUBLICATION-ADD-TABLE.patch
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v1-0003-Add-EXCEPT-support-to-ALTER-PUBLICATION-SET-TABLE.patch
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