wehub-resource-sync
96 lines
3.0 KiB
Go
96 lines
3.0 KiB
Go
// Copyright 2025 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 expression
|
|
|
|
import (
|
|
"github.com/dolthub/go-mysql-server/sql"
|
|
"github.com/dolthub/go-mysql-server/sql/expression"
|
|
|
|
pgtypes "github.com/dolthub/doltgresql/server/types"
|
|
)
|
|
|
|
// IsNotNull is an implementation of sql.Expression for the IS NOT NULL operator
|
|
// and includes Postgres-specific logic for handling records and composites.
|
|
type IsNotNull struct {
|
|
expression.UnaryExpressionStub
|
|
}
|
|
|
|
var _ sql.Expression = (*IsNotNull)(nil)
|
|
var _ sql.CollationCoercible = (*IsNotNull)(nil)
|
|
var _ sql.IsNotNullExpression = (*IsNotNull)(nil)
|
|
|
|
// NewIsNotNull creates a new IsNotNull expression.
|
|
func NewIsNotNull(child sql.Expression) *IsNotNull {
|
|
return &IsNotNull{expression.UnaryExpressionStub{Child: child}}
|
|
}
|
|
|
|
// IsNotNullExpression implements the sql.IsNotNullExpression interface. This function exists primarily
|
|
// to ensure the IsNotNullExpression interface has a unique signature.
|
|
func (e *IsNotNull) IsNotNullExpression() bool {
|
|
return true
|
|
}
|
|
|
|
// Type implements the Expression interface.
|
|
func (e *IsNotNull) Type(ctx *sql.Context) sql.Type {
|
|
return pgtypes.Bool
|
|
}
|
|
|
|
// CollationCoercibility implements the interface sql.CollationCoercible.
|
|
func (*IsNotNull) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
|
|
return sql.Collation_binary, 5
|
|
}
|
|
|
|
// IsNullable implements the Expression interface.
|
|
func (e *IsNotNull) IsNullable(ctx *sql.Context) bool {
|
|
return false
|
|
}
|
|
|
|
// Eval implements the Expression interface.
|
|
func (e *IsNotNull) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
|
|
v, err := e.Child.Eval(ctx, row)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Slices of typed values (e.g. Record and Composite types in Postgres) evaluate
|
|
// true for IS NOT NULL only if ALL of their entries are not NULL.
|
|
if tupleValue, ok := v.([]pgtypes.RecordValue); ok {
|
|
for _, typedValue := range tupleValue {
|
|
if typedValue.Value == nil {
|
|
return false, nil
|
|
}
|
|
}
|
|
return true, nil
|
|
}
|
|
|
|
return v != nil, nil
|
|
}
|
|
|
|
func (e *IsNotNull) String() string {
|
|
return e.Child.String() + " IS NOT NULL"
|
|
}
|
|
|
|
func (e *IsNotNull) DebugString(ctx *sql.Context) string {
|
|
return sql.DebugString(ctx, e.Child) + " IS NOT NULL"
|
|
}
|
|
|
|
// WithChildren implements the Expression interface.
|
|
func (e *IsNotNull) WithChildren(ctx *sql.Context, children ...sql.Expression) (sql.Expression, error) {
|
|
if len(children) != 1 {
|
|
return nil, sql.ErrInvalidChildrenNumber.New(e, len(children), 1)
|
|
}
|
|
return NewIsNotNull(children[0]), nil
|
|
}
|