chore: import upstream snapshot with attribution
This commit is contained in:
wehub-resource-sync
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// 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 node
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import (
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"context"
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"fmt"
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"slices"
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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/go-mysql-server/sql/plan"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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"github.com/dolthub/doltgresql/core"
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"github.com/dolthub/doltgresql/core/id"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// CreateDomain handles the CREATE DOMAIN statement.
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type CreateDomain struct {
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SchemaName string
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Name string
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AsType *pgtypes.DoltgresType
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Collation string
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HasDefault bool
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DefaultExpr sql.Expression
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IsNotNull bool
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CheckConstraintNames []string
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CheckConstraints sql.CheckConstraints
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overrides sql.EngineOverrides
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}
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var _ sql.ExecSourceRel = (*CreateDomain)(nil)
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var _ sql.NodeOverriding = (*CreateDomain)(nil)
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var _ vitess.Injectable = (*CreateDomain)(nil)
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// Children implements the interface sql.ExecSourceRel.
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func (c *CreateDomain) Children() []sql.Node {
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return nil
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}
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// IsReadOnly implements the interface sql.ExecSourceRel.
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func (c *CreateDomain) IsReadOnly() bool {
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return false
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}
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// Resolved implements the interface sql.ExecSourceRel.
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func (c *CreateDomain) Resolved() bool {
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return true
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}
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// RowIter implements the interface sql.ExecSourceRel.
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func (c *CreateDomain) RowIter(ctx *sql.Context, r sql.Row) (sql.RowIter, error) {
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schema, err := core.GetSchemaName(ctx, nil, c.SchemaName)
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if err != nil {
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return nil, err
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}
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collection, err := core.GetTypesCollectionFromContext(ctx, "")
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if err != nil {
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return nil, err
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}
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internalID := id.NewType(schema, c.Name)
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arrayID := id.NewType(schema, "_"+c.Name)
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if collection.HasType(ctx, internalID) {
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return nil, pgtypes.ErrTypeAlreadyExists.New(c.Name)
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}
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var defExpr string
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if c.DefaultExpr != nil {
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defExpr = c.DefaultExpr.String()
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}
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checkDefs := make([]*sql.CheckDefinition, len(c.CheckConstraints))
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for i, check := range c.CheckConstraints {
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checkName := c.CheckConstraintNames[i]
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if checkName == "" {
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checkName = generateCheckNameForDomain(c.Name, c.CheckConstraintNames)
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// add this to the list of names to avoid duplicates later in the loop
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c.CheckConstraintNames[i] = checkName
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check.Name = checkName
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}
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checkDefs[i], err = plan.NewCheckDefinition(ctx, check, sql.GetSchemaFormatter(c.overrides))
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if err != nil {
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return nil, err
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}
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}
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newType := pgtypes.NewDomainType(ctx, c.AsType, defExpr, c.IsNotNull, checkDefs, arrayID, internalID)
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err = collection.CreateType(ctx, newType)
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if err != nil {
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return nil, err
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}
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// create array type of this type
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arrayType := pgtypes.CreateArrayTypeFromBaseType(newType)
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err = collection.CreateType(ctx, arrayType)
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if err != nil {
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return nil, err
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}
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newType.Array = arrayType
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return sql.RowsToRowIter(), nil
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}
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// generateCheckNameForDomain generates a unique check constraint name for a domain when one is not provided. The
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// name must be unique for this type, but doesn't need to be unique across all constraint names in the database.
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// Postgres generates names like `domainname_check`, and then uses `domainname_check1`, `domainname_check2`, etc.
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// Our behavior varies slightly, in that if a user provides a name that collides with a generated name, we will use
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// `domain_check` (no suffix) before moving on to `domain_check2` etc.
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func generateCheckNameForDomain(domainName string, allNames []string) string {
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name := domainName + "_check"
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for i := 1; ; i++ {
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if !slices.Contains(allNames, name) {
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return name
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}
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name = fmt.Sprintf("%s_check%d", domainName, i)
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}
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}
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// Schema implements the interface sql.ExecSourceRel.
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func (c *CreateDomain) Schema(ctx *sql.Context) sql.Schema {
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return nil
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}
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// String implements the interface sql.ExecSourceRel.
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func (c *CreateDomain) String() string {
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return "CREATE DOMAIN"
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}
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// WithChildren implements the interface sql.ExecSourceRel.
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func (c *CreateDomain) WithChildren(ctx *sql.Context, children ...sql.Node) (sql.Node, error) {
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return plan.NillaryWithChildren(c, children...)
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}
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// WithOverrides implements the interface sql.NodeOverriding.
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func (c *CreateDomain) WithOverrides(overrides sql.EngineOverrides) sql.Node {
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c.overrides = overrides
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return c
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}
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// WithResolvedChildren implements the interface vitess.Injectable.
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func (c *CreateDomain) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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checksStartAt := 0
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var defExpr sql.Expression
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if c.HasDefault {
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expr, ok := children[0].(sql.Expression)
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if !ok {
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return nil, errors.Errorf("invalid vitess child, expected sql.Expression for Default value but got %t", children[0])
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}
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defExpr = expr
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checksStartAt = 1
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}
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var checks sql.CheckConstraints
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for i, child := range children[checksStartAt:] {
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expr, ok := child.(sql.Expression)
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if !ok {
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return nil, errors.Errorf("invalid vitess child, expected sql.Expression for Check constraint value but got %t", children[0])
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}
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checks = append(checks, &sql.CheckConstraint{
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Name: c.CheckConstraintNames[i],
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Expr: expr,
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Enforced: true,
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})
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}
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if !c.AsType.IsResolvedType() {
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sqlCtx, ok := ctx.(*sql.Context)
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if !ok {
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return nil, errors.Errorf("%T requires a SQL context for type resolution", c)
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}
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typeColl, err := core.GetTypesCollectionFromContext(sqlCtx, "")
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if err != nil {
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return nil, err
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}
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resolvedType, err := typeColl.ResolveType(sqlCtx, c.AsType.ID)
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if err != nil {
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return nil, err
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}
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c.AsType = resolvedType
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}
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if !c.AsType.IsDefined {
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return nil, pgtypes.ErrTypeIsOnlyAShell.New(c.AsType.Name())
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}
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return &CreateDomain{
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SchemaName: c.SchemaName,
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Name: c.Name,
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AsType: c.AsType,
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Collation: c.Collation,
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HasDefault: c.HasDefault,
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DefaultExpr: defExpr,
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IsNotNull: c.IsNotNull,
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CheckConstraintNames: c.CheckConstraintNames,
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CheckConstraints: checks,
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}, nil
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}
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// DomainColumn represents the column name `VALUE.
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// It is a placeholder column reference later
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// used for column defined as the domain type.
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type DomainColumn struct {
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Typ *pgtypes.DoltgresType
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}
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var _ vitess.Injectable = (*DomainColumn)(nil)
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var _ sql.Expression = (*DomainColumn)(nil)
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// Resolved implements the interface sql.Expression.
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func (d *DomainColumn) Resolved() bool {
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return true
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}
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// String implements the interface sql.Expression.
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func (d *DomainColumn) String() string {
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return "VALUE"
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}
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// Type implements the interface sql.Expression.
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func (d *DomainColumn) Type(ctx *sql.Context) sql.Type {
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if d.Typ.IsEmptyType() {
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return pgtypes.Unknown
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}
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return d.Typ
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}
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// IsNullable implements the interface sql.Expression.
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func (d *DomainColumn) IsNullable(ctx *sql.Context) bool {
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return false
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}
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// Eval implements the interface sql.Expression.
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func (d *DomainColumn) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
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panic("DomainColumn is a placeholder expression, but Eval() was called")
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}
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// Children implements the interface sql.Expression.
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func (d *DomainColumn) Children() []sql.Expression {
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return nil
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}
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// WithChildren implements the interface sql.Expression.
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func (d *DomainColumn) WithChildren(ctx *sql.Context, children ...sql.Expression) (sql.Expression, error) {
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if len(children) != 0 {
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return nil, sql.ErrInvalidChildrenNumber.New(d, len(children), 0)
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}
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return d, nil
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}
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// WithResolvedChildren implements the interface vitess.Injectable.
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func (d *DomainColumn) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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if len(children) != 0 {
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return nil, errors.Errorf("invalid vitess child count, expected `0` but got `%d`", len(children))
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}
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return d, nil
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}
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