Support :unlogged_tables_default Database option on Postgres for maki…

…ng created tables unlogged by default

This can improve performance in cases where data integrity is not
important.

CHANGELOG

@@ -1,5 +1,7 @@
 === master
 
+* Support :unlogged_tables_default Database option on Postgres for making created tables unlogged by default (jeremyevans) (#2134)
+
 * Add Dataset#select_prepend for prepending to the current selected columns (jeremyevans) (#2139)
 
 === 5.78.0 (2024-03-01)

doc/opening_databases.rdoc

@@ -346,6 +346,8 @@ The following additional options are supported:
                 separated by commas (for use via a URL: <tt>postgres:///?search_path=schema1,schema2</tt>), or it
                 can be an array of strings (for use via an option:
                 <tt>Sequel.postgres(search_path: ['schema1', 'schema2'])</tt>).
+:unlogged_tables_default :: Set to true to use UNLOGGED by default for created tables, for potentially better performance
+                            when data integrity is not important.
 :use_iso_date_format :: This can be set to false to not force the ISO date format.  Sequel forces
                         it by default to allow for an optimization.
 

lib/sequel/adapters/shared/postgres.rb

@@ -1425,7 +1425,7 @@ def create_table_prefix_sql(name, options)
         elsif options[:foreign]
           raise(Error, "can't provide both :foreign and :unlogged to create_table") if options[:unlogged]
           'FOREIGN '
-        elsif options[:unlogged]
+        elsif options.fetch(:unlogged){typecast_value_boolean(@opts[:unlogged_tables_default])}
           'UNLOGGED '
         end
 

spec/core/mock_adapter_spec.rb

@@ -529,6 +529,24 @@ def a.method_missing(m, *x) push(*x) end
     @db.sqls.must_equal ['CREATE UNLOGGED TABLE "unlogged_dolls" ("name" text)']
   end
 
+  it "should respect :unlogged_tables_default Database option when creating a table" do
+    @db.opts[:unlogged_tables_default] = true
+    @db.create_table(:unlogged_dolls, :unlogged => true){text :name}
+    @db.sqls.must_equal ['CREATE UNLOGGED TABLE "unlogged_dolls" ("name" text)']
+    @db.create_table(:unlogged_dolls){text :name}
+    @db.sqls.must_equal ['CREATE UNLOGGED TABLE "unlogged_dolls" ("name" text)']
+    @db.create_table(:unlogged_dolls, :unlogged => false){text :name}
+    @db.sqls.must_equal ['CREATE TABLE "unlogged_dolls" ("name" text)']
+
+    @db.opts[:unlogged_tables_default] = 't'
+    @db.create_table(:unlogged_dolls){text :name}
+    @db.sqls.must_equal ['CREATE UNLOGGED TABLE "unlogged_dolls" ("name" text)']
+
+    @db.opts[:unlogged_tables_default] = 'f'
+    @db.create_table(:unlogged_dolls){text :name}
+    @db.sqls.must_equal ['CREATE TABLE "unlogged_dolls" ("name" text)']
+  end
+
   it "should support spatial indexes" do
     @db.alter_table(:posts){add_spatial_index [:geom]}
     @db.sqls.must_equal ['CREATE INDEX "posts_geom_index" ON "posts" USING gist ("geom")']