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ARROW-2733: [GLib] Cast garrow_decimal128 to gint64 #2157

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ARROW-2733: [GLib] Cast garrow_decimal128 to gint64 #2157

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15 changes: 15 additions & 0 deletions c_glib/arrow-glib/decimal.cpp
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Expand Up @@ -202,6 +202,21 @@ garrow_decimal128_negate(GArrowDecimal128 *decimal)
arrow_decimal->Negate();
}

/**
* garrow_decimal128_to_integer:
* @decimal: A #GArrowDecimal128.
*
* Returns: The 64-bit integer representation of the decimal.
*
* Since: 0.10.0
*/
gint64
garrow_decimal128_to_integer(GArrowDecimal128 *decimal)
{
auto arrow_decimal = garrow_decimal128_get_raw(decimal);
return static_cast<int64_t>(*arrow_decimal);
}

G_END_DECLS

GArrowDecimal128 *
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1 change: 1 addition & 0 deletions c_glib/arrow-glib/decimal.h
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Expand Up @@ -42,5 +42,6 @@ gchar *garrow_decimal128_to_string_scale(GArrowDecimal128 *decimal,
gchar *garrow_decimal128_to_string(GArrowDecimal128 *decimal);
void garrow_decimal128_abs(GArrowDecimal128 *decimal);
void garrow_decimal128_negate(GArrowDecimal128 *decimal);
gint64 garrow_decimal128_to_integer(GArrowDecimal128 *decimal);

G_END_DECLS
6 changes: 6 additions & 0 deletions c_glib/test/test-decimal.rb
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Expand Up @@ -46,4 +46,10 @@ def test_negate
decimal.negate
assert_equal(positive_value, decimal.to_s)
end

def test_to_integer
integer_data = 999999999999999999
decimal = Arrow::Decimal128.new(integer_data)
assert_equal(integer_data, decimal.to_i)
end
end