wehub-resource-sync
127 lines
3.5 KiB
Go
127 lines
3.5 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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"github.com/dolthub/dolt/go/libraries/doltcore/doltdb"
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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/core/dataloader"
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"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
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)
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// CopyFrom handles the COPY ... FROM ... statement.
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type CopyFrom struct {
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DatabaseName string
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TableName doltdb.TableName
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File string
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Stdin bool
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Columns tree.NameList
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CopyOptions tree.CopyOptions
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InsertStub *vitess.Insert
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DataLoader dataloader.DataLoader
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}
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var _ vitess.Injectable = (*CopyFrom)(nil)
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var _ sql.ExecSourceRel = (*CopyFrom)(nil)
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// NewCopyFrom returns a new *CopyFrom.
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func NewCopyFrom(
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databaseName string,
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tableName doltdb.TableName,
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options tree.CopyOptions,
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fileName string,
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stdin bool,
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columns tree.NameList,
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insertStub *vitess.Insert,
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) *CopyFrom {
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switch options.CopyFormat {
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case tree.CopyFormatCsv, tree.CopyFormatText:
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// no-op
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case tree.CopyFormatBinary:
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panic("BINARY format is not supported for COPY FROM")
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default:
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panic(fmt.Sprintf("unknown COPY FROM format: %d", options.CopyFormat))
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}
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return &CopyFrom{
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DatabaseName: databaseName,
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TableName: tableName,
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File: fileName,
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Stdin: stdin,
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Columns: columns,
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CopyOptions: options,
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InsertStub: insertStub,
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}
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}
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// Children implements the interface sql.ExecSourceRel.
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func (cf *CopyFrom) 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 (cf *CopyFrom) 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 (cf *CopyFrom) 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 (cf *CopyFrom) RowIter(ctx *sql.Context, r sql.Row) (_ sql.RowIter, err error) {
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return cf.DataLoader.RowIter(ctx, r)
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}
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// Schema implements the interface sql.ExecSourceRel.
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func (cf *CopyFrom) Schema(ctx *sql.Context) sql.Schema {
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// For Parse calls, we need access to the schema before we have a DataLoader created, so return a stub schema.
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if cf.DataLoader == nil {
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return nil
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}
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return cf.DataLoader.Schema(ctx)
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}
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// String implements the interface sql.ExecSourceRel.
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func (cf *CopyFrom) String() string {
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source := "STDIN"
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if cf.File != "" {
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source = fmt.Sprintf("'%s'", cf.File)
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}
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return fmt.Sprintf("COPY FROM %s", source)
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}
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// WithChildren implements the interface sql.ExecSourceRel.
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func (cf *CopyFrom) WithChildren(ctx *sql.Context, children ...sql.Node) (sql.Node, error) {
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if len(children) != 0 {
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return nil, sql.ErrInvalidChildrenNumber.New(cf, len(children), 0)
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}
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return cf, nil
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}
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// WithResolvedChildren implements the interface vitess.Injectable.
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func (cf *CopyFrom) 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 cf, nil
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}
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