wehub-resource-sync
118 lines
3.8 KiB
Go
118 lines
3.8 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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"fmt"
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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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"github.com/dolthub/doltgresql/server/functions/framework"
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)
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// UnaryOperator represents a VALUE OPERATOR VALUE expression.
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type UnaryOperator struct {
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operator framework.Operator
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compiledFunc framework.Function
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}
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var _ vitess.Injectable = (*UnaryOperator)(nil)
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var _ sql.Expression = (*UnaryOperator)(nil)
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// NewUnaryOperator returns a new *UnaryOperator.
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func NewUnaryOperator(operator framework.Operator) *UnaryOperator {
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return &UnaryOperator{operator: operator}
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}
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// Children implements the sql.Expression interface.
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func (b *UnaryOperator) Children() []sql.Expression {
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return b.compiledFunc.Children()
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}
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// Eval implements the sql.Expression interface.
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func (b *UnaryOperator) Eval(ctx *sql.Context, row sql.Row) (any, error) {
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return b.compiledFunc.Eval(ctx, row)
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}
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// IsNullable implements the sql.Expression interface.
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func (b *UnaryOperator) IsNullable(ctx *sql.Context) bool {
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return b.compiledFunc.IsNullable(ctx)
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}
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// Resolved implements the sql.Expression interface.
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func (b *UnaryOperator) Resolved() bool {
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return b.compiledFunc.Resolved()
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}
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// String implements the sql.Expression interface.
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func (b *UnaryOperator) String() string {
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if b.compiledFunc == nil {
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return fmt.Sprintf("%s?", b.operator.String())
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}
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// We know that we'll always have one parameter here
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switch f := b.compiledFunc.(type) {
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case *framework.CompiledFunction:
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return fmt.Sprintf("%s%s", b.operator.String(), f.Arguments[0].String())
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case *framework.QuickFunction1:
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return fmt.Sprintf("%s%s", b.operator.String(), f.Argument.String())
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default:
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return fmt.Sprintf("unexpected unary operator function type: %T", b.compiledFunc)
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}
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}
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// Type implements the sql.Expression interface.
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func (b *UnaryOperator) Type(ctx *sql.Context) sql.Type {
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return b.compiledFunc.Type(ctx)
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}
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// WithChildren implements the sql.Expression interface.
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func (b *UnaryOperator) 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(b, len(children), 1)
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}
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compiledFunc, err := b.compiledFunc.WithChildren(ctx, children...)
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if err != nil {
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return nil, err
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}
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return &UnaryOperator{
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operator: b.operator,
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compiledFunc: compiledFunc.(framework.Function),
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}, nil
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}
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// WithResolvedChildren implements the vitess.InjectableExpression interface.
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func (b *UnaryOperator) 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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sqlCtx := ctx.(*sql.Context)
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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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funcName := "internal_unary_operator_func_" + b.operator.String()
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compiledFunc := framework.GetUnaryFunction(b.operator).Compile(sqlCtx, funcName, child)
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if compiledFunc == nil {
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return nil, errors.Errorf("operator does not exist: %s%s", b.operator.String(), child.Type(sqlCtx).String())
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}
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return &UnaryOperator{
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operator: b.operator,
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compiledFunc: compiledFunc,
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}, nil
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}
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