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// Copyright 2023 Goldman Sachs
//
// 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
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import meta::pure::metamodel::relation::*;
import meta::pure::test::pct::*;

native function meta::pure::functions::relation::distinct(rel:Relation[1], columns:ColSpecArray[1]):Relation[1];

function <> meta::pure::functions::relation::tests::distinct::testSimpleDistinct():Boolean[1]
{
    let res = #TDS
                val, str
                1, a
                3, ewe
                1, qw
                5, wwe
                5, weq
              #->distinct(~[val]);
    assertEquals(3, $res->size());
    assertEquals('135', $res->map(c|$c.val->toOne()->toString())->joinStrings(''));
}