should be it

external/duckdb/tools/juliapkg/test/test_config.jl

@@ -0,0 +1,96 @@
+# test_config.jl
+
+@testset "Test configuration parameters" begin
+    # by default NULLs come first
+    con = DBInterface.connect(DuckDB.DB, ":memory:")
+
+    results = DBInterface.execute(con, "SELECT 42 a UNION ALL SELECT NULL ORDER BY a")
+    tbl = rowtable(results)
+    @test isequal(tbl, [(a = 42,), (a = missing,)])
+
+    DBInterface.close!(con)
+
+    # if we add this configuration flag, nulls should come last
+    config = DuckDB.Config()
+    DuckDB.set_config(config, "default_null_order", "nulls_first")
+
+    con = DBInterface.connect(DuckDB.DB, ":memory:", config)
+
+    # NULL should come last now
+    results = DBInterface.execute(con, "SELECT 42 a UNION ALL SELECT NULL ORDER BY a")
+    df = DataFrame(results)
+    @test names(df) == ["a"]
+    @test size(df, 1) == 2
+    @test isequal(df.a, [missing, 42])
+
+    DBInterface.close!(con)
+
+    DuckDB.set_config(config, "unrecognized option", "aaa")
+    @test_throws DuckDB.ConnectionException con = DBInterface.connect(DuckDB.DB, ":memory:", config)
+
+    DBInterface.close!(config)
+    DBInterface.close!(config)
+
+    # test different ways to create a config object, all should be equivalent
+    conf1 = DuckDB.Config()
+    DuckDB.set_config(conf1, "default_null_order", "nulls_first")
+
+    conf2 = DuckDB.Config()
+    conf2["default_null_order"] = "nulls_first"
+
+    conf3 = DuckDB.Config(default_null_order = "nulls_first")
+    conf4 = DuckDB.Config(["default_null_order" => "nulls_first"])
+
+    @testset for config in [conf1, conf2, conf3, conf4]
+        con = DBInterface.connect(DuckDB.DB, ":memory:", config)
+
+        # NULL should come last now
+        results = DBInterface.execute(con, "SELECT 42 a UNION ALL SELECT NULL ORDER BY a")
+        tbl = rowtable(results)
+        @test isequal(tbl, [(a = missing,), (a = 42,)])
+
+        DBInterface.close!(con)
+
+        DuckDB.set_config(config, "unrecognized option", "aaa")
+        @test_throws DuckDB.ConnectionException con = DBInterface.connect(DuckDB.DB, ":memory:", config)
+
+        DBInterface.close!(config)
+        DBInterface.close!(config)
+    end
+
+    # config options can be specified directly in the call
+    con = DBInterface.connect(DuckDB.DB, ":memory:"; config = ["default_null_order" => "nulls_first"])
+    tbl = DBInterface.execute(con, "SELECT 42 a UNION ALL SELECT NULL ORDER BY a") |> rowtable
+    @test isequal(tbl, [(a = missing,), (a = 42,)])
+    close(con)
+
+    con = DBInterface.connect(DuckDB.DB, ":memory:"; config = (; default_null_order = "nulls_first"))
+    tbl = DBInterface.execute(con, "SELECT 42 a UNION ALL SELECT NULL ORDER BY a") |> rowtable
+    @test isequal(tbl, [(a = missing,), (a = 42,)])
+    close(con)
+
+    # special handling of the readonly option
+    file = tempname()
+    con = DBInterface.connect(DuckDB.DB, file)
+    DBInterface.execute(con, "CREATE TABLE t1(a INTEGER)")
+    close(con)
+    con = DBInterface.connect(DuckDB.DB, file; readonly = true)
+    @test_throws DuckDB.QueryException DBInterface.execute(con, "CREATE TABLE t2(a INTEGER)")
+    close(con)
+end
+
+@testset "Test Set TimeZone" begin
+    con = DBInterface.connect(DuckDB.DB, ":memory:")
+
+    DBInterface.execute(con, "SET TimeZone='UTC'")
+    results = DBInterface.execute(con, "SELECT CURRENT_SETTING('TimeZone') AS tz")
+    df = DataFrame(results)
+    @test isequal(df[1, "tz"], "UTC")
+
+    DBInterface.execute(con, "SET TimeZone='America/Los_Angeles'")
+    results = DBInterface.execute(con, "SELECT CURRENT_SETTING('TimeZone') AS tz")
+    df = DataFrame(results)
+    @test isequal(df[1, "tz"], "America/Los_Angeles")
+
+    DBInterface.close!(con)
+end