Method test_cast

test/sql/test_compiler.py:2912–3043

(self)

        )

    def test_cast(self):
        tbl = table(
            "casttest",
            column("id", Integer),
            column("v1", Float),
            column("v2", Float),
            column("ts", TIMESTAMP),
        )

        def check_results(dialect, expected_results, literal):
            eq_(
                len(expected_results),
                5,
                "Incorrect number of expected results",
            )
            eq_(
                str(cast(tbl.c.v1, Numeric).compile(dialect=dialect)),
                "CAST(casttest.v1 AS %s)" % expected_results[0],
            )
            eq_(
                str(tbl.c.v1.cast(Numeric).compile(dialect=dialect)),
                "CAST(casttest.v1 AS %s)" % expected_results[0],
            )
            eq_(
                str(cast(tbl.c.v1, Numeric(12, 9)).compile(dialect=dialect)),
                "CAST(casttest.v1 AS %s)" % expected_results[1],
            )
            eq_(
                str(cast(tbl.c.ts, Date).compile(dialect=dialect)),
                "CAST(casttest.ts AS %s)" % expected_results[2],
            )
            eq_(
                str(cast(1234, Text).compile(dialect=dialect)),
                "CAST(%s AS %s)" % (literal, expected_results[3]),
            )
            eq_(
                str(cast("test", String(20)).compile(dialect=dialect)),
                "CAST(%s AS %s)" % (literal, expected_results[4]),
            )

            # fixme: shoving all of this dialect-specific stuff in one test
            # is now officially completely ridiculous AND non-obviously omits
            # coverage on other dialects.
            sel = select(tbl, cast(tbl.c.v1, Numeric)).compile(dialect=dialect)

            # TODO: another unusual result from disambiguate only:
            # v1__1 vs v1_1 are due to the special meaning
            # WrapsColumnExpression gives to the "_anon_name_label" attribute,
            # where it tries to default to a label name that matches that of
            # the column within.

            if isinstance(dialect, type(mysql.dialect())):
                eq_(
                    str(sel),
                    "SELECT casttest.id, casttest.v1, casttest.v2, "
                    "casttest.ts, "
                    "CAST(casttest.v1 AS DECIMAL) AS v1__1 \n"
                    "FROM casttest",