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Allow UNIQUE indexes on partitioned tables

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If we restrict unique constraints on partitioned tables so that they
must always include the partition key, then our standard approach to
unique indexes already works --- each unique key is forced to exist
within a single partition, so enforcing the unique restriction in each
index individually is enough to have it enforced globally.  Therefore we
can implement unique indexes on partitions by simply removing a few
restrictions (and adding others.)

Discussion: https://postgr.es/m/20171222212921.hi6hg6pem2w2t36z@alvherre.pgsql
Discussion: https://postgr.es/m/20171229230607.3iib6b62fn3uaf47@alvherre.pgsql
Reviewed-by: Simon Riggs, Jesper Pedersen, Peter Eisentraut, Jaime
	Casanova, Amit Langote
This commit is contained in:
Alvaro Herrera
2018-02-19 16:59:37 -03:00
parent 524d64ea8e
commit eb7ed3f306
27 changed files with 907 additions and 95 deletions
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6
src/test/regress/sql/create_index.sql
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@@ -834,6 +834,12 @@ DROP INDEX cwi_replaced_pkey; -- Should fail; a constraint depends on it
DROP TABLE cwi_test;
-- ADD CONSTRAINT USING INDEX is forbidden on partitioned tables
CREATE TABLE cwi_test(a int) PARTITION BY hash (a);
create unique index on cwi_test (a);
alter table cwi_test add primary key using index cwi_test_a_idx ;
DROP TABLE cwi_test;
--
-- Check handling of indexes on system columns
--