wehub-resource-sync
121 lines
3.2 KiB
Go
121 lines
3.2 KiB
Go
// Copyright 2024 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expression
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import (
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"context"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// Not represents a NOT expression.
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type Not struct {
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child sql.Expression
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}
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var _ vitess.Injectable = (*Not)(nil)
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var _ sql.Expression = (*Not)(nil)
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// NewNot returns a new *Not.
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func NewNot() *Not {
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return &Not{
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child: nil,
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}
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}
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var _ sql.IndexComparisonExpression = (*Not)(nil)
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// Children implements the sql.Expression interface.
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func (n *Not) Children() []sql.Expression {
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return []sql.Expression{n.child}
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}
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// Eval implements the sql.Expression interface.
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func (n *Not) Eval(ctx *sql.Context, row sql.Row) (any, error) {
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val, err := n.child.Eval(ctx, row)
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if err != nil {
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return nil, err
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}
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if val == nil {
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return nil, nil
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}
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boolVal, ok := val.(bool)
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if !ok {
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return nil, errors.Errorf("NOT only applies to boolean values")
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}
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return !boolVal, nil
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}
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// IsNullable implements the sql.Expression interface.
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func (n *Not) IsNullable(ctx *sql.Context) bool {
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return true
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}
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// Resolved implements the sql.Expression interface.
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func (n *Not) Resolved() bool {
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return n.child != nil && n.child.Resolved()
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}
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// String implements the sql.Expression interface.
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func (n *Not) String() string {
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if n.child == nil {
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return "NOT ?"
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}
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return "NOT " + n.child.String()
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}
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// Type implements the sql.Expression interface.
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func (n *Not) Type(ctx *sql.Context) sql.Type {
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return pgtypes.Bool
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}
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// WithChildren implements the sql.Expression interface.
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func (n *Not) WithChildren(ctx *sql.Context, children ...sql.Expression) (sql.Expression, error) {
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if len(children) != 1 {
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return nil, sql.ErrInvalidChildrenNumber.New(n, len(children), 1)
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}
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return &Not{
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child: children[0],
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}, nil
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}
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// WithResolvedChildren implements the vitess.InjectableExpression interface.
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func (n *Not) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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if len(children) != 1 {
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return nil, errors.Errorf("invalid vitess child count, expected `1` but got `%d`", len(children))
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}
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child, ok := children[0].(sql.Expression)
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if !ok {
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return nil, errors.Errorf("expected vitess child to be an expression but has type `%T`", children[0])
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}
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return &Not{
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child: child,
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}, nil
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}
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// IndexScanOperation implements the sql.IndexComparisonExpression interface.
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func (n *Not) IndexScanOperation() (sql.IndexScanOp, sql.Expression, sql.Expression, bool) {
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it, ok := n.child.(*InTuple)
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if !ok {
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return 0, nil, nil, false
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}
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return sql.IndexScanOpNotInSet, it.Left(), it.Right(), true
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}
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