wehub-resource-sync
97 lines
2.9 KiB
Go
97 lines
2.9 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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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// ImplicitCast handles implicit casts.
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type ImplicitCast struct {
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expr sql.Expression
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sourceType *pgtypes.DoltgresType
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targetType *pgtypes.DoltgresType
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}
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var _ sql.Expression = (*ImplicitCast)(nil)
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// NewImplicitCast returns a new *ImplicitCast expression.
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func NewImplicitCast(expr sql.Expression, fromType *pgtypes.DoltgresType, toType *pgtypes.DoltgresType) *ImplicitCast {
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toType = checkForDomainType(toType)
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fromType = checkForDomainType(fromType)
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return &ImplicitCast{
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expr: expr,
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sourceType: fromType,
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targetType: toType,
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}
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}
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// Children implements the sql.Expression interface.
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func (ic *ImplicitCast) Children() []sql.Expression {
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return []sql.Expression{ic.expr}
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}
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// Eval implements the sql.Expression interface.
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func (ic *ImplicitCast) Eval(ctx *sql.Context, row sql.Row) (any, error) {
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val, err := ic.expr.Eval(ctx, row)
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if err != nil || val == nil {
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return val, err
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}
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castsColl, err := core.GetCastsCollectionFromContext(ctx, "")
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if err != nil {
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return nil, err
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}
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cast, err := castsColl.GetImplicitCast(ctx, ic.sourceType, ic.targetType)
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if err != nil {
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return nil, err
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}
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if !cast.ID.IsValid() {
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return nil, errors.Errorf("target is of type %s but expression is of type %s", ic.targetType.String(), ic.sourceType.String())
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}
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return cast.Eval(ctx, val, ic.sourceType, ic.targetType)
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}
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// IsNullable implements the sql.Expression interface.
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func (ic *ImplicitCast) 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 (ic *ImplicitCast) Resolved() bool {
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return ic.expr.Resolved()
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}
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// String implements the sql.Expression interface.
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func (ic *ImplicitCast) String() string {
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return ic.expr.String()
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}
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// Type implements the sql.Expression interface.
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func (ic *ImplicitCast) Type(ctx *sql.Context) sql.Type {
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return ic.targetType
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}
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// WithChildren implements the sql.Expression interface.
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func (ic *ImplicitCast) 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(ic, len(children), 1)
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}
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return NewImplicitCast(children[0], ic.sourceType, ic.targetType), nil
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}
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