github.com/dolthub/go-mysql-server@v0.18.0/sql/expression/function/spatial/st_length_test.go (about)

     1  // Copyright 2020-2022 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 spatial
    16  
    17  import (
    18  	"math"
    19  	"testing"
    20  
    21  	"github.com/stretchr/testify/require"
    22  
    23  	"github.com/dolthub/go-mysql-server/sql"
    24  	"github.com/dolthub/go-mysql-server/sql/expression"
    25  	"github.com/dolthub/go-mysql-server/sql/types"
    26  )
    27  
    28  func TestSTLength(t *testing.T) {
    29  	t.Run("select unit length", func(t *testing.T) {
    30  		require := require.New(t)
    31  		f, err := NewSTLength(expression.NewLiteral(types.LineString{Points: []types.Point{{X: 0, Y: 0}, {X: 0, Y: 1}}}, types.LineStringType{}))
    32  		require.NoError(err)
    33  
    34  		v, err := f.Eval(sql.NewEmptyContext(), nil)
    35  		require.NoError(err)
    36  		require.Equal(1.0, v)
    37  	})
    38  
    39  	t.Run("select sqrt 2", func(t *testing.T) {
    40  		require := require.New(t)
    41  		f, err := NewSTLength(expression.NewLiteral(types.LineString{Points: []types.Point{{X: 0, Y: 0}, {X: 1, Y: 1}}}, types.LineStringType{}))
    42  		require.NoError(err)
    43  
    44  		v, err := f.Eval(sql.NewEmptyContext(), nil)
    45  		require.NoError(err)
    46  		require.Equal(math.Sqrt2, v)
    47  	})
    48  
    49  	t.Run("select perimeter of unit square", func(t *testing.T) {
    50  		require := require.New(t)
    51  		f, err := NewSTLength(expression.NewLiteral(types.LineString{Points: []types.Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: 1, Y: 1}, {X: 1, Y: 0}, {X: 0, Y: 0}}}, types.LineStringType{}))
    52  		require.NoError(err)
    53  
    54  		v, err := f.Eval(sql.NewEmptyContext(), nil)
    55  		require.NoError(err)
    56  		require.Equal(4.0, v)
    57  	})
    58  
    59  	t.Run("select length of some line", func(t *testing.T) {
    60  		require := require.New(t)
    61  		f, err := NewSTLength(expression.NewLiteral(types.LineString{Points: []types.Point{{X: 0, Y: 0}, {X: 0, Y: 1}, {X: -1, Y: -1}, {X: -1, Y: 1.23}, {X: 55, Y: 12}}}, types.LineStringType{}))
    62  		require.NoError(err)
    63  
    64  		v, err := f.Eval(sql.NewEmptyContext(), nil)
    65  		require.NoError(err)
    66  		require.Equal(62.49231544303096, v)
    67  	})
    68  
    69  	t.Run("select length of NULL", func(t *testing.T) {
    70  		require := require.New(t)
    71  		f, err := NewSTLength(expression.NewLiteral(nil, types.Null))
    72  		require.NoError(err)
    73  		v, err := f.Eval(sql.NewEmptyContext(), nil)
    74  		require.NoError(err)
    75  		require.Equal(nil, v)
    76  	})
    77  
    78  	t.Run("select length of wrong spatial type", func(t *testing.T) {
    79  		require := require.New(t)
    80  		f, err := NewSTLength(expression.NewLiteral(types.Point{X: 0, Y: 0}, types.PointType{}))
    81  		require.NoError(err)
    82  		v, err := f.Eval(sql.NewEmptyContext(), nil)
    83  		require.NoError(err)
    84  		require.Equal(nil, v)
    85  	})
    86  
    87  	t.Run("select length of wrong type", func(t *testing.T) {
    88  		require := require.New(t)
    89  		f, err := NewSTLength(expression.NewLiteral("abc", types.Text))
    90  		require.NoError(err)
    91  		_, err = f.Eval(sql.NewEmptyContext(), nil)
    92  		require.Error(err)
    93  	})
    94  }