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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
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import pytest
from sqlglot import expressions as sge

from bigframes.core.compile.sqlglot.aggregations import op_registration
from bigframes.operations import aggregations as agg_ops


def test_register_then_get():
    reg = op_registration.OpRegistration()
    input = sge.to_identifier("A")
    op = agg_ops.SizeOp()

    @reg.register(agg_ops.SizeOp)
    def test_func(op: agg_ops.SizeOp, input: sge.Expression) -> sge.Expression:
        return input

    assert reg[agg_ops.SizeOp()](op, input) == test_func(op, input)


def test_register_function_first_argument_is_not_agg_op_raise_error():
    reg = op_registration.OpRegistration()

    @reg.register(agg_ops.SizeOp)
    def test_func(input: sge.Expression) -> sge.Expression:
        return input

    with pytest.raises(
        ValueError, match=r".*first parameter must be a window operator.*"
    ):
        test_func(sge.to_identifier("A"))
