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Allow new values to be added to an existing enum type.

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After much expenditure of effort, we've got this to the point where the
performance penalty is pretty minimal in typical cases.

Andrew Dunstan, reviewed by Brendan Jurd, Dean Rasheed, and Tom Lane
This commit is contained in:
Tom Lane
2010-10-24 23:04:37 -04:00
parent 24b29ca8f9
commit 84c123be1d
23 changed files with 1422 additions and 170 deletions
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86
src/test/regress/sql/enum.sql
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@@ -15,6 +15,92 @@ SELECT COUNT(*) FROM pg_enum WHERE enumtypid = 'rainbow'::regtype;
SELECT 'red'::rainbow;
SELECT 'mauve'::rainbow;
--
-- adding new values
--
CREATE TYPE planets AS ENUM ( 'venus', 'earth', 'mars' );
SELECT enumlabel, enumsortorder
FROM pg_enum
WHERE enumtypid = 'planets'::regtype
ORDER BY 2;
ALTER TYPE planets ADD 'uranus';
SELECT enumlabel, enumsortorder
FROM pg_enum
WHERE enumtypid = 'planets'::regtype
ORDER BY 2;
ALTER TYPE planets ADD 'mercury' BEFORE 'venus';
ALTER TYPE planets ADD 'saturn' BEFORE 'uranus';
ALTER TYPE planets ADD 'jupiter' AFTER 'mars';
ALTER TYPE planets ADD 'neptune' AFTER 'uranus';
SELECT enumlabel, enumsortorder
FROM pg_enum
WHERE enumtypid = 'planets'::regtype
ORDER BY 2;
SELECT enumlabel, enumsortorder
FROM pg_enum
WHERE enumtypid = 'planets'::regtype
ORDER BY enumlabel::planets;
-- errors for adding labels
ALTER TYPE planets ADD
'plutoplutoplutoplutoplutoplutoplutoplutoplutoplutoplutoplutoplutopluto';
ALTER TYPE planets ADD 'pluto' AFTER 'zeus';
--
-- Test inserting so many values that we have to renumber
--
create type insenum as enum ('L1', 'L2');
alter type insenum add 'i1' before 'L2';
alter type insenum add 'i2' before 'L2';
alter type insenum add 'i3' before 'L2';
alter type insenum add 'i4' before 'L2';
alter type insenum add 'i5' before 'L2';
alter type insenum add 'i6' before 'L2';
alter type insenum add 'i7' before 'L2';
alter type insenum add 'i8' before 'L2';
alter type insenum add 'i9' before 'L2';
alter type insenum add 'i10' before 'L2';
alter type insenum add 'i11' before 'L2';
alter type insenum add 'i12' before 'L2';
alter type insenum add 'i13' before 'L2';
alter type insenum add 'i14' before 'L2';
alter type insenum add 'i15' before 'L2';
alter type insenum add 'i16' before 'L2';
alter type insenum add 'i17' before 'L2';
alter type insenum add 'i18' before 'L2';
alter type insenum add 'i19' before 'L2';
alter type insenum add 'i20' before 'L2';
alter type insenum add 'i21' before 'L2';
alter type insenum add 'i22' before 'L2';
alter type insenum add 'i23' before 'L2';
alter type insenum add 'i24' before 'L2';
alter type insenum add 'i25' before 'L2';
alter type insenum add 'i26' before 'L2';
alter type insenum add 'i27' before 'L2';
alter type insenum add 'i28' before 'L2';
alter type insenum add 'i29' before 'L2';
alter type insenum add 'i30' before 'L2';
-- The exact values of enumsortorder will now depend on the local properties
-- of float4, but in any reasonable implementation we should get at least
-- 20 splits before having to renumber; so only hide values > 20.
SELECT enumlabel,
case when enumsortorder > 20 then null else enumsortorder end as so
FROM pg_enum
WHERE enumtypid = 'insenum'::regtype
ORDER BY enumsortorder;
--
-- Basic table creation, row selection
--