planner: make (*AccessPath).OnlyPointRange more succinct

planner/util/path.go

@@ -151,35 +151,21 @@ func isColEqCorColOrConstant(ctx sessionctx.Context, filter expression.Expressio
 
 // OnlyPointRange checks whether each range is a point(no interval range exists).
 func (path *AccessPath) OnlyPointRange(sctx sessionctx.Context) bool {
-	noIntervalRange := true
 	if path.IsIntHandlePath {
 		for _, ran := range path.Ranges {
-			if !ran.IsPoint(sctx) {
-				noIntervalRange = false
-				break
+			if !ran.IsPointNullable(sctx.GetSessionVars().StmtCtx) {
+				return false
 			}
 		}
-		return noIntervalRange
+		return true
 	}
-	haveNullVal := false
 	for _, ran := range path.Ranges {
 		// Not point or the not full matched.
-		if !ran.IsPoint(sctx) || len(ran.HighVal) != len(path.Index.Columns) {
-			noIntervalRange = false
-			break
-		}
-		// Check whether there's null value.
-		for i := 0; i < len(path.Index.Columns); i++ {
-			if ran.HighVal[i].IsNull() {
-				haveNullVal = true
-				break
-			}
-		}
-		if haveNullVal {
-			break
+		if !ran.IsPointNonNullable(sctx) || len(ran.HighVal) != len(path.Index.Columns) {
+			return false
 		}
 	}
-	return noIntervalRange && !haveNullVal
+	return true
 }
 
 // Col2Len maps expression.Column.UniqueID to column length

planner/util/path_test.go

@@ -12,61 +12,103 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package util
+package util_test
 
 import (
 	"testing"
 
+	"github.com/pingcap/tidb/parser/model"
+	"github.com/pingcap/tidb/planner/core"
+	"github.com/pingcap/tidb/planner/util"
+	"github.com/pingcap/tidb/types"
+	"github.com/pingcap/tidb/util/ranger"
 	"github.com/stretchr/testify/require"
 )
 
 func TestCompareCol2Len(t *testing.T) {
 	tests := []struct {
-		c1         Col2Len
-		c2         Col2Len
+		c1         util.Col2Len
+		c2         util.Col2Len
 		res        int
 		comparable bool
 	}{
 		{
-			c1:         Col2Len{1: -1, 2: -1, 3: -1},
-			c2:         Col2Len{1: -1, 2: 10},
+			c1:         util.Col2Len{1: -1, 2: -1, 3: -1},
+			c2:         util.Col2Len{1: -1, 2: 10},
 			res:        1,
 			comparable: true,
 		},
 		{
-			c1:         Col2Len{1: 5},
-			c2:         Col2Len{1: 10, 2: -1},
+			c1:         util.Col2Len{1: 5},
+			c2:         util.Col2Len{1: 10, 2: -1},
 			res:        -1,
 			comparable: true,
 		},
 		{
-			c1:         Col2Len{1: -1, 2: -1},
-			c2:         Col2Len{1: -1, 2: 5, 3: -1},
+			c1:         util.Col2Len{1: -1, 2: -1},
+			c2:         util.Col2Len{1: -1, 2: 5, 3: -1},
 			res:        0,
 			comparable: false,
 		},
 		{
-			c1:         Col2Len{1: -1, 2: 10},
-			c2:         Col2Len{1: -1, 2: 5, 3: -1},
+			c1:         util.Col2Len{1: -1, 2: 10},
+			c2:         util.Col2Len{1: -1, 2: 5, 3: -1},
 			res:        0,
 			comparable: false,
 		},
 		{
-			c1:         Col2Len{1: -1, 2: 10},
-			c2:         Col2Len{1: -1, 2: 10},
+			c1:         util.Col2Len{1: -1, 2: 10},
+			c2:         util.Col2Len{1: -1, 2: 10},
 			res:        0,
 			comparable: true,
 		},
 		{
-			c1:         Col2Len{1: -1, 2: -1},
-			c2:         Col2Len{1: -1, 2: 10},
+			c1:         util.Col2Len{1: -1, 2: -1},
+			c2:         util.Col2Len{1: -1, 2: 10},
 			res:        0,
 			comparable: false,
 		},
 	}
 	for _, tt := range tests {
-		res, comparable := CompareCol2Len(tt.c1, tt.c2)
+		res, comparable := util.CompareCol2Len(tt.c1, tt.c2)
 		require.Equal(t, tt.res, res)
 		require.Equal(t, tt.comparable, comparable)
 	}
 }
+
+func TestOnlyPointRange(t *testing.T) {
+	t.Parallel()
+	sctx := core.MockContext()
+	nullDatum := types.MinNotNullDatum()
+	nullDatum.SetNull()
+	nullPointRange := ranger.Range{
+		LowVal:  []types.Datum{*nullDatum.Clone()},
+		HighVal: []types.Datum{*nullDatum.Clone()},
+	}
+	onePointRange := ranger.Range{
+		LowVal:  []types.Datum{types.NewIntDatum(1)},
+		HighVal: []types.Datum{types.NewIntDatum(1)},
+	}
+	one2TwoRange := ranger.Range{
+		LowVal:  []types.Datum{types.NewIntDatum(1)},
+		HighVal: []types.Datum{types.NewIntDatum(2)},
+	}
+
+	intHandlePath := &util.AccessPath{IsIntHandlePath: true}
+	intHandlePath.Ranges = []*ranger.Range{&nullPointRange, &onePointRange}
+	require.True(t, intHandlePath.OnlyPointRange(sctx))
+	intHandlePath.Ranges = []*ranger.Range{&onePointRange, &one2TwoRange}
+	require.False(t, intHandlePath.OnlyPointRange(sctx))
+
+	indexPath := &util.AccessPath{Index: &model.IndexInfo{Columns: make([]*model.IndexColumn, 1)}}
+	indexPath.Ranges = []*ranger.Range{&onePointRange}
+	require.True(t, indexPath.OnlyPointRange(sctx))
+	indexPath.Ranges = []*ranger.Range{&nullPointRange, &onePointRange}
+	require.False(t, indexPath.OnlyPointRange(sctx))
+	indexPath.Ranges = []*ranger.Range{&onePointRange, &one2TwoRange}
+	require.False(t, indexPath.OnlyPointRange(sctx))
+
+	indexPath.Index.Columns = make([]*model.IndexColumn, 2)
+	indexPath.Ranges = []*ranger.Range{&onePointRange}
+	require.False(t, indexPath.OnlyPointRange(sctx))
+}