wehub-resource-sync
107 lines
3.3 KiB
Go
107 lines
3.3 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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// AssignmentCast handles assignment casts.
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type AssignmentCast 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 = (*AssignmentCast)(nil)
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// NewAssignmentCast returns a new *AssignmentCast expression.
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func NewAssignmentCast(expr sql.Expression, sourceType *pgtypes.DoltgresType, targetType *pgtypes.DoltgresType) *AssignmentCast {
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targetType = checkForDomainType(targetType)
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sourceType = checkForDomainType(sourceType)
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return &AssignmentCast{
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expr: expr,
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sourceType: sourceType,
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targetType: targetType,
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}
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}
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// Children implements the sql.Expression interface.
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func (ac *AssignmentCast) Children() []sql.Expression {
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return []sql.Expression{ac.expr}
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}
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// Eval implements the sql.Expression interface.
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func (ac *AssignmentCast) Eval(ctx *sql.Context, row sql.Row) (any, error) {
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val, err := ac.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.GetAssignmentCast(ctx, ac.sourceType, ac.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("ASSIGNMENT_CAST: target is of type %s but expression is of type %s: %s",
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ac.targetType.String(), ac.sourceType.String(), ac.expr.String())
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}
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return cast.Eval(ctx, val, ac.sourceType, ac.targetType)
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}
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// IsNullable implements the sql.Expression interface.
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func (ac *AssignmentCast) 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 (ac *AssignmentCast) Resolved() bool {
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return ac.expr.Resolved()
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}
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// String implements the sql.Expression interface.
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func (ac *AssignmentCast) String() string {
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return ac.expr.String()
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}
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// Type implements the sql.Expression interface.
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func (ac *AssignmentCast) Type(ctx *sql.Context) sql.Type {
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return ac.targetType
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}
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// WithChildren implements the sql.Expression interface.
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func (ac *AssignmentCast) 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(ac, len(children), 1)
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}
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return NewAssignmentCast(children[0], ac.sourceType, ac.targetType), nil
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}
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// checkForDomainType returns the underlying type if the given type is a domain type. Casting always applies to the base
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// type.
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func checkForDomainType(t *pgtypes.DoltgresType) *pgtypes.DoltgresType {
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if t.TypType == pgtypes.TypeType_Domain {
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t = t.DomainUnderlyingBaseType()
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}
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return t
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}
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