wehub-resource-sync
253 lines
9.3 KiB
Go
253 lines
9.3 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 node
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import (
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"context"
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"fmt"
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"math"
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"strings"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/dolt/go/libraries/doltcore/doltdb"
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"github.com/dolthub/dolt/go/libraries/doltcore/sqle"
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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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"github.com/dolthub/doltgresql/core/sequences"
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pgexprs "github.com/dolthub/doltgresql/server/expression"
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"github.com/dolthub/doltgresql/server/functions/framework"
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"github.com/dolthub/doltgresql/server/tables"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// CreateSequence handles the CREATE SEQUENCE statement, along with SERIAL type definitions.
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type CreateSequence struct {
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schema string
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ifNotExists bool
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fromAlter bool
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sequence *sequences.Sequence
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}
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var _ sql.ExecSourceRel = (*CreateSequence)(nil)
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var _ vitess.Injectable = (*CreateSequence)(nil)
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// NewCreateSequence returns a new *CreateSequence.
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func NewCreateSequence(ifNotExists bool, schema string, fromAlter bool, sequence *sequences.Sequence) *CreateSequence {
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return &CreateSequence{
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schema: schema,
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ifNotExists: ifNotExists,
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fromAlter: fromAlter,
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sequence: sequence,
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}
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}
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// Children implements the interface sql.ExecSourceRel.
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func (c *CreateSequence) 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 *CreateSequence) 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 *CreateSequence) 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 *CreateSequence) RowIter(ctx *sql.Context, r sql.Row) (sql.RowIter, error) {
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if strings.HasPrefix(strings.ToLower(c.sequence.Id.SequenceName()), "dolt") {
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return nil, errors.Errorf("sequences cannot be prefixed with 'dolt'")
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}
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schema, err := core.GetSchemaName(ctx, nil, c.schema)
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if err != nil {
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return nil, err
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}
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// The sequence won't have the schema filled in, so we have to do that now
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c.sequence.Id = id.NewSequence(schema, c.sequence.Id.SequenceName())
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// Check that the sequence name is free across all relation types (tables, sequences, views, indexes).
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// GetSqlDatabaseFromContext returns a plain sqle.Database (not a PgDatabase), so we wrap it
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// with tables.WrapSqleDatabase before calling GetSchema so that ValidateNewRelationName is available.
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// TODO: Consider always wrapping the returned db from GetSqlDatabaseFromContext()
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rawDb, err := core.GetSqlDatabaseFromContext(ctx, "")
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if err != nil {
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return nil, err
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}
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if rawDb != nil {
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if sdb, ok := rawDb.(sqle.Database); ok {
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pgDb := tables.WrapSqleDatabase(sdb)
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if schemaDb, found, dbErr := pgDb.GetSchema(ctx, schema); dbErr != nil {
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return nil, dbErr
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} else if found {
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if v, ok := schemaDb.(sql.SchemaObjectNameValidator); ok {
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nameAlreadyUsed, err := v.ValidateNewSequenceName(ctx, c.sequence.Id.SequenceName(), c.ifNotExists)
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if err != nil {
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return nil, err
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} else if nameAlreadyUsed && c.ifNotExists {
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return sql.RowsToRowIter(), nil
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}
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}
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} else if !found {
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return nil, fmt.Errorf(`schema "%s" not found`, schema)
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}
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}
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}
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// Check that the OWNED BY is valid, if it exists
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var table sql.Table
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var tableSch sql.Schema
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var tableColumn *sql.Column
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if c.sequence.OwnerTable.IsValid() {
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// The table will only have its name set, so we need to fill in the schema as well
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c.sequence.OwnerTable = id.NewTable(schema, c.sequence.OwnerTable.TableName())
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relationType, err := core.GetRelationType(ctx, schema, c.sequence.OwnerTable.TableName())
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if err != nil {
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return nil, err
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}
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if relationType == core.RelationType_DoesNotExist {
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return nil, errors.Errorf(`relation "%s" does not exist`, c.sequence.OwnerTable.TableName())
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} else if relationType != core.RelationType_Table {
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return nil, errors.Errorf(`sequence cannot be owned by relation "%s"`, c.sequence.OwnerTable.TableName())
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}
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table, err = core.GetSqlTableFromContext(ctx, "", doltdb.TableName{Name: c.sequence.OwnerTable.TableName(), Schema: schema})
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if err != nil {
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return nil, err
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}
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if table == nil {
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return nil, errors.Errorf(`table "%s" cannot be found but says it exists`, c.sequence.OwnerTable.TableName())
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}
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tableSch = table.Schema(ctx)
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for _, col := range tableSch {
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if col.Name == c.sequence.OwnerColumn {
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tableColumn = col.Copy()
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break
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}
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}
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if tableColumn == nil {
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return nil, errors.Errorf(`column "%s" of relation "%s" does not exist`,
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c.sequence.OwnerColumn, c.sequence.OwnerTable.TableName())
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}
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// If this is from an ALTER TABLE statement, then we have to adjust the type since we didn't have that information earlier
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if c.fromAlter {
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dgType, ok := tableColumn.Type.(*pgtypes.DoltgresType)
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if !ok {
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return nil, errors.Errorf(`column "%s" of relation "%s" has unexpected type: "%s"`,
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c.sequence.OwnerColumn, c.sequence.OwnerTable.TableName(), tableColumn.Type.String())
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}
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switch dgType.ID {
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case pgtypes.Int16.ID:
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c.sequence.DataTypeID = pgtypes.Int16.ID
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if c.sequence.Minimum < int64(math.MinInt16) {
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c.sequence.Minimum = int64(math.MinInt16)
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}
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if c.sequence.Maximum > int64(math.MaxInt16) {
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c.sequence.Maximum = int64(math.MaxInt16)
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}
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case pgtypes.Int32.ID:
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c.sequence.DataTypeID = pgtypes.Int32.ID
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if c.sequence.Minimum < int64(math.MinInt32) {
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c.sequence.Minimum = int64(math.MinInt32)
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}
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if c.sequence.Maximum > int64(math.MaxInt32) {
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c.sequence.Maximum = int64(math.MaxInt32)
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}
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case pgtypes.Int64.ID:
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c.sequence.DataTypeID = pgtypes.Int64.ID
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// Minimum and Maximum are already set to the Int64 values
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default:
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// Not sure what we should do if we encounter a non-integer type, so we'll error for now
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return nil, errors.Errorf(`column "%s" of relation "%s" has an unsupported type: "%s"`,
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c.sequence.OwnerColumn, c.sequence.OwnerTable.TableName(), tableColumn.Type.String())
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}
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}
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}
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// Create the sequence since we know it's completely valid
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// TODO: we always create the sequence in the current database, but there's no need to require this, and in fact we
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// need to support it to create a sequence on another branch than the current one
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collection, err := core.GetSequencesCollectionFromContext(ctx, ctx.GetCurrentDatabase())
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if err != nil {
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return nil, err
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}
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if err = collection.CreateSequence(ctx, c.sequence); err != nil {
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return nil, err
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}
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if c.fromAlter {
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if tableColumn == nil {
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// This check is to satisfy the linter
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return nil, errors.New(`somehow unable to find the matching table column which should have failed a previous step`)
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}
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// TODO: What happens when we add a sequence to a column that already has a default value? We'll error until we find out
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if tableColumn.Default != nil || tableColumn.Generated != nil {
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return nil, errors.New(`cannot add a sequence to a column that already has a default value`)
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}
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alterableTable, ok := table.(*sqle.AlterableDoltTable)
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if !ok {
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return nil, errors.Errorf(`expected a Dolt table but received "%T"`, table)
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}
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// TODO: Do we need to convert to a TableName and then call String? Are we reliant on the specific way it's formatted?
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// This is how it's done in the analyzer for SERIAL types, so assuming it's for a good reason.
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seqName := doltdb.TableName{Name: c.sequence.Id.SequenceName(), Schema: c.sequence.Id.SchemaName()}.String()
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nextVal, foundFunc, err := framework.GetFunction(ctx, "nextval", pgexprs.NewTextLiteral(seqName))
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if err != nil {
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return nil, err
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}
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if !foundFunc {
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return nil, errors.Errorf(`function "nextval" could not be found`)
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}
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tableColumn.Default = &sql.ColumnDefaultValue{
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Expr: nextVal,
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OutType: tableColumn.Type.(*pgtypes.DoltgresType),
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Literal: false,
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ReturnNil: false,
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Parenthesized: false,
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}
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err = alterableTable.ModifyColumn(ctx, tableColumn.Name, tableColumn, nil)
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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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return sql.RowsToRowIter(), nil
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}
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// Schema implements the interface sql.ExecSourceRel.
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func (c *CreateSequence) 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 *CreateSequence) String() string {
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return "CREATE SEQUENCE"
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}
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// WithChildren implements the interface sql.ExecSourceRel.
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func (c *CreateSequence) 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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// WithResolvedChildren implements the interface vitess.Injectable.
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func (c *CreateSequence) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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if len(children) != 0 {
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return nil, ErrVitessChildCount.New(0, len(children))
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}
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return c, nil
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}
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