/
merge.go
85 lines (70 loc) · 2.28 KB
/
merge.go
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// Copyright 2020 Dolthub, Inc.
//
// 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.
package dfunctions
import (
"fmt"
"strings"
"github.com/dolthub/go-mysql-server/sql"
goerrors "gopkg.in/src-d/go-errors.v1"
)
const MergeFuncName = "merge"
var ErrUncommittedChanges = goerrors.NewKind("cannot merge with uncommitted changes")
// Deprecated: please use the version in the dprocedures package
type MergeFunc struct {
children []sql.Expression
}
// NewMergeFunc creates a new MergeFunc expression.
// Deprecated: please use the version in the dprocedures package
func NewMergeFunc(args ...sql.Expression) (sql.Expression, error) {
return &MergeFunc{children: args}, nil
}
// Eval implements the Expression interface.
func (mf *MergeFunc) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
args, err := getDoltArgs(ctx, row, mf.Children())
if err != nil {
return noConflicts, err
}
return DoDoltMerge(ctx, args)
}
// String implements the Stringer interface.
func (mf *MergeFunc) String() string {
childrenStrings := make([]string, len(mf.children))
for i, child := range mf.children {
childrenStrings[i] = child.String()
}
return fmt.Sprintf("Merge(%s)", strings.Join(childrenStrings, ","))
}
// IsNullable implements the Expression interface.
func (mf *MergeFunc) IsNullable() bool {
return false
}
func (mf *MergeFunc) Resolved() bool {
for _, child := range mf.Children() {
if !child.Resolved() {
return false
}
}
return true
}
func (mf *MergeFunc) Children() []sql.Expression {
return mf.children
}
// WithChildren implements the Expression interface.
func (mf *MergeFunc) WithChildren(children ...sql.Expression) (sql.Expression, error) {
return NewMergeFunc(children...)
}
// Type implements the Expression interface.
func (mf *MergeFunc) Type() sql.Type {
return sql.Text
}