(maint) workaround postgresql bug #15865 #3010
Merged
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PostgreSQL 9.6.14 introduced a bug:
BUG #15865: ALTER TABLE statements causing "relation already exists" errors when some indexes exist
See: https://www.postgresql.org/message-id/15865-17940eacc8f8b081%40postgresql.org
This will make any ALTER TABLE statement only affect a single column per
statement.