pgsql: Propagate ALTER TABLE ... SET STORAGE to indexes

Propagate ALTER TABLE ... SET STORAGE to indexes

When creating a new index, the attstorage setting of the table column
is copied to regular (non-expression) index columns. But a later
ALTER TABLE ... SET STORAGE is not propagated to indexes, thus
creating an inconsistent and undumpable state.

Discussion: https://www.postgresql.org/message-id/flat/9765d72b-37c0-06f5-e349-2a580aafd989%402ndquadrant.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/501e41dd3cb945287fdcfe25e8906e79872fcc44

Modified Files
--------------
contrib/test_decoding/expected/toast.out | 4 +++
contrib/test_decoding/sql/toast.sql | 5 ++++
src/backend/commands/tablecmds.c | 47 +++++++++++++++++++++++++++++++
src/test/regress/expected/alter_table.out | 20 +++++++++++++
src/test/regress/expected/vacuum.out | 4 +--
src/test/regress/sql/alter_table.sql | 6 ++++
src/test/regress/sql/vacuum.sql | 4 +--
7 files changed, 86 insertions(+), 4 deletions(-)