github.com/dolthub/go-mysql-server@v0.18.0/sql/rowexec/offset_test.go (about)

     1  // Copyright 2020-2021 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package rowexec
    16  
    17  import (
    18  	"testing"
    19  
    20  	"github.com/stretchr/testify/require"
    21  
    22  	"github.com/dolthub/go-mysql-server/memory"
    23  	"github.com/dolthub/go-mysql-server/sql/expression"
    24  	"github.com/dolthub/go-mysql-server/sql/plan"
    25  	"github.com/dolthub/go-mysql-server/sql/types"
    26  )
    27  
    28  func TestOffsetPlan(t *testing.T) {
    29  	require := require.New(t)
    30  
    31  	db, table, _ := getTestingTable(t)
    32  	pro := memory.NewDBProvider(db)
    33  	ctx := newContext(pro)
    34  
    35  	offset := plan.NewOffset(expression.NewLiteral(0, types.Int8), plan.NewResolvedTable(table, nil, nil))
    36  	require.Equal(1, len(offset.Children()))
    37  
    38  	iter, err := DefaultBuilder.Build(ctx, offset, nil)
    39  	require.NoError(err)
    40  	require.NotNil(iter)
    41  }
    42  
    43  func TestOffset(t *testing.T) {
    44  	require := require.New(t)
    45  
    46  	db, table, n := getTestingTable(t)
    47  	pro := memory.NewDBProvider(db)
    48  	ctx := newContext(pro)
    49  
    50  	offset := plan.NewOffset(expression.NewLiteral(1, types.Int8), plan.NewResolvedTable(table, nil, nil))
    51  
    52  	iter, err := DefaultBuilder.Build(ctx, offset, nil)
    53  	require.NoError(err)
    54  	assertRows(t, ctx, iter, int64(n-1))
    55  }