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tupletype.go
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tupletype.go
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// Copyright 2020-2021 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 sql
import (
"fmt"
"strings"
"github.com/dolthub/vitess/go/sqltypes"
"github.com/dolthub/vitess/go/vt/proto/query"
)
type TupleType []Type
// CreateTuple returns a new tuple type with the given element types.
func CreateTuple(types ...Type) Type {
return TupleType(types)
}
func (t TupleType) Compare(a, b interface{}) (int, error) {
if hasNulls, res := compareNulls(a, b); hasNulls {
return res, nil
}
a, err := t.Convert(a)
if err != nil {
return 0, err
}
b, err = t.Convert(b)
if err != nil {
return 0, err
}
left := a.([]interface{})
right := b.([]interface{})
for i := range left {
cmp, err := t[i].Compare(left[i], right[i])
if err != nil {
return 0, err
}
if cmp != 0 {
return cmp, nil
}
}
return 0, nil
}
func (t TupleType) Convert(v interface{}) (interface{}, error) {
if v == nil {
return nil, nil
}
if vals, ok := v.([]interface{}); ok {
if len(vals) != len(t) {
return nil, ErrInvalidColumnNumber.New(len(t), len(vals))
}
var result = make([]interface{}, len(t))
for i, typ := range t {
var err error
result[i], err = typ.Convert(vals[i])
if err != nil {
return nil, err
}
}
return result, nil
}
return nil, ErrNotTuple.New(v)
}
func (t TupleType) MustConvert(v interface{}) interface{} {
value, err := t.Convert(v)
if err != nil {
panic(err)
}
return value
}
func (t TupleType) Promote() Type {
return t
}
func (t TupleType) SQL(interface{}) (sqltypes.Value, error) {
return sqltypes.Value{}, fmt.Errorf("unable to convert tuple type to SQL")
}
func (t TupleType) String() string {
var elems = make([]string, len(t))
for i, el := range t {
elems[i] = el.String()
}
return fmt.Sprintf("TUPLE(%s)", strings.Join(elems, ", "))
}
func (t TupleType) Type() query.Type {
return sqltypes.Expression
}
func (t TupleType) Zero() interface{} {
zeroes := make([]interface{}, len(t))
for i, tt := range t {
zeroes[i] = tt.Zero()
}
return zeroes
}