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Fix interaction of TOAST compression with expression indexes.

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Before, trying to compress a value for insertion into an expression
index would crash.

Dilip Kumar, with some editing by me. Report by Jaime Casanova.

Discussion: http://postgr.es/m/CAJKUy5gcs0zGOp6JXU2mMVdthYhuQpFk=S3V8DOKT=LZC1L36Q@mail.gmail.com
This commit is contained in:
Robert Haas
2021-03-25 19:55:32 -04:00
parent 71f4c8c6f7
commit 5db1fd7823
6 changed files with 54 additions and 5 deletions
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7
src/test/regress/sql/compression.sql
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@ -130,6 +130,13 @@ SELECT pg_column_compression(f1) FROM cmdata;
VACUUM FULL cmdata;
SELECT pg_column_compression(f1) FROM cmdata;
-- test expression index
DROP TABLE cmdata2;
CREATE TABLE cmdata2 (f1 TEXT COMPRESSION pglz, f2 TEXT COMPRESSION lz4);
CREATE UNIQUE INDEX idx1 ON cmdata2 ((f1 || f2));
INSERT INTO cmdata2 VALUES((SELECT array_agg(md5(g::TEXT))::TEXT FROM
generate_series(1, 50) g), VERSION());
-- check data is ok
SELECT length(f1) FROM cmdata;
SELECT length(f1) FROM cmdata1;