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MS: Add view_exists? #4

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Jan 15, 2024
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MS: Add view_exists? #4

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11 changes: 10 additions & 1 deletion lib/sequel/adapters/redshift.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -31,13 +31,22 @@ def adapter_initialize
end

def table_exists?(name)
relation_exists?(name, 'r')
end

def view_exists?(name)
relation_exists?(name, 'v')
end

# @param [String] relkind 'r' for table, 'v' for view
def relation_exists?(name, relkind)
sql = <<~SQL
SELECT EXISTS (
SELECT * FROM pg_catalog.pg_class c
JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE n.nspname = 'public'
AND c.relname = '#{name}'
AND c.relkind = 'r'
AND c.relkind = '#{relkind}'
);
SQL
fetch(sql).first.fetch(:"?column?")
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