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into.go
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into.go
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// Copyright 2022 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 plan
import (
"fmt"
"strings"
"github.com/dolthub/go-mysql-server/sql"
)
// Into is a node to wrap the top-level node in a query plan so that any result will set user-defined or others
// variables given
type Into struct {
UnaryNode
IntoVars []sql.Expression
Dumpfile string
Outfile string
Charset string
FieldsTerminatedBy string
FieldsEnclosedBy string
FieldsEnclosedByOpt bool
FieldsEscapedBy string
LinesStartingBy string
LinesTerminatedBy string
}
var _ sql.Node = (*Into)(nil)
var _ sql.CollationCoercible = (*Into)(nil)
// Default values as defined here: https://dev.mysql.com/doc/refman/8.0/en/load-data.html
const (
defaultFieldsTerminatedBy = "\t"
defaultFieldsEnclosedBy = ""
defaultFieldsEnclosedByOpt = false
defaultFieldsEscapedBy = "\\"
defaultLinesStartingBy = ""
defaultLinesTerminatedBy = "\n"
)
func NewInto(
child sql.Node,
variables []sql.Expression,
outfile, dumpfile string) *Into {
return &Into{
UnaryNode: UnaryNode{child},
IntoVars: variables,
Dumpfile: dumpfile,
Outfile: outfile,
FieldsTerminatedBy: defaultFieldsTerminatedBy,
FieldsEnclosedBy: defaultFieldsEnclosedBy,
FieldsEnclosedByOpt: defaultFieldsEnclosedByOpt,
FieldsEscapedBy: defaultFieldsEscapedBy,
LinesStartingBy: defaultLinesStartingBy,
LinesTerminatedBy: defaultLinesTerminatedBy,
}
}
// Schema implements the Node interface.
func (i *Into) Schema() sql.Schema {
// SELECT INTO does not return results directly (only through SQL vars or files),
// so it's result schema is always empty.
return nil
}
func (i *Into) IsReadOnly() bool {
return i.Child.IsReadOnly()
}
func (i *Into) String() string {
p := sql.NewTreePrinter()
var vars = make([]string, len(i.IntoVars))
for j, v := range i.IntoVars {
vars[j] = fmt.Sprintf(v.String())
}
_ = p.WriteNode("Into(%s, Outfile %s, Dumpfile %s)", strings.Join(vars, ", "), i.Outfile, i.Dumpfile)
_ = p.WriteChildren(i.Child.String())
return p.String()
}
func (i *Into) DebugString() string {
p := sql.NewTreePrinter()
var vars = make([]string, len(i.IntoVars))
for j, v := range i.IntoVars {
vars[j] = sql.DebugString(v)
}
_ = p.WriteNode("Into(%s, Outfile %s, Dumpfile %s)", strings.Join(vars, ", "), i.Outfile, i.Dumpfile)
_ = p.WriteChildren(sql.DebugString(i.Child))
return p.String()
}
func (i *Into) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(i, len(children), 1)
}
ni := *i
ni.Child = children[0]
return &ni, nil
}
// CheckPrivileges implements the interface sql.Node.
func (i *Into) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
return i.Child.CheckPrivileges(ctx, opChecker)
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (i *Into) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.GetCoercibility(ctx, i.Child)
}
// WithExpressions implements the sql.Expressioner interface.
func (i *Into) WithExpressions(exprs ...sql.Expression) (sql.Node, error) {
if len(exprs) != len(i.IntoVars) {
return nil, sql.ErrInvalidChildrenNumber.New(i, len(exprs), len(i.IntoVars))
}
ni := *i
ni.IntoVars = exprs
return &ni, nil
}
// Expressions implements the sql.Expressioner interface.
func (i *Into) Expressions() []sql.Expression {
return i.IntoVars
}