Обсуждение: [COMMITTERS] pgsql: Move autogenerated array types out of the way during ALTER ...R

Move autogenerated array types out of the way during ALTER ... RENAME.

Commit 9aa3c782c added code to allow CREATE TABLE/CREATE TYPE to not fail
when the desired type name conflicts with an autogenerated array type, by
dint of renaming the array type out of the way.  But I (tgl) overlooked
that the same case arises in ALTER TABLE/TYPE RENAME.  Fix that too.
Back-patch to all supported branches.

Report and patch by Vik Fearing, modified a bit by me

Discussion: https://postgr.es/m/0f4ade49-4f0b-a9a3-c120-7589f01d1eb8@2ndquadrant.com

Branch
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REL9_4_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/8f62b388b5c946cc1c6e5c1c6fd5cff0865b46a9

Modified Files
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src/backend/catalog/pg_type.c             | 38 ++++++++++++++++++------
src/test/regress/expected/alter_table.out | 49 +++++++++++++++++++++++++++++++
src/test/regress/sql/alter_table.sql      | 20 +++++++++++++
3 files changed, 98 insertions(+), 9 deletions(-)