# Postgres maximum number of columns in a table is 1600 (https://github.com/postgres/postgres/blob/de41869b64d57160f58852eab20a27f248188135/src/include/access/htup_details.h#L23-L47).
# And since:
# "The DROP COLUMN form does not physically remove the column, but simply makes
# it invisible to SQL operations. Subsequent insert and update operations in the
# table will store a null value for the column. Thus, dropping a column is quick
# but it will not immediately reduce the on-disk size of your table, as the space
# occupied by the dropped column is not reclaimed.
# The space will be reclaimed over time as existing rows are updated."
# according to https://www.postgresql.org/docs/current/sql-altertable.html.
# We drop and recreate the database if any table has more than 1200 columns, just to be safe.
max_allowed_columns=1200
tables_with_more_than_allowed_columns=
ApplicationRecord.connection.execute("SELECT attrelid::regclass::text AS table, COUNT(*) AS column_count FROM pg_attribute GROUP BY attrelid HAVING COUNT(*) > #{max_allowed_columns}")
# Postgres maximum number of columns in a table is 1600 (https://github.com/postgres/postgres/blob/de41869b64d57160f58852eab20a27f248188135/src/include/access/htup_details.h#L23-L47).
# And since:
# "The DROP COLUMN form does not physically remove the column, but simply makes
# it invisible to SQL operations. Subsequent insert and update operations in the
# table will store a null value for the column. Thus, dropping a column is quick
# but it will not immediately reduce the on-disk size of your table, as the space
# occupied by the dropped column is not reclaimed.
# The space will be reclaimed over time as existing rows are updated."
# according to https://www.postgresql.org/docs/current/sql-altertable.html.
# We drop and recreate the database if any table has more than 1200 columns, just to be safe.
