resolved_table.go

// Copyright 2020-2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package plan

import (
	"fmt"

	"github.com/Rock-liyi/p2pdb-store/sql"
)

// ResolvedTable represents a resolved SQL Table.
type ResolvedTable struct {
	sql.Table
	Database sql.Database
	AsOf     interface{}
}

var _ sql.Node = (*ResolvedTable)(nil)

// NewResolvedTable creates a new instance of ResolvedTable.
func NewResolvedTable(table sql.Table, db sql.Database, asOf interface{}) *ResolvedTable {
	return &ResolvedTable{table, db, asOf}
}

// Resolved implements the Resolvable interface.
func (*ResolvedTable) Resolved() bool {
	return true
}

func (t *ResolvedTable) String() string {
	return fmt.Sprintf("Table(%s)", t.Table.Name())
}

func (t *ResolvedTable) DebugString() string {
	return fmt.Sprintf("Table(%s)", sql.DebugString(t.Table))
}

// Children implements the Node interface.
func (*ResolvedTable) Children() []sql.Node { return nil }

// RowIter implements the RowIter interface.
func (t *ResolvedTable) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
	span, ctx := ctx.Span("plan.ResolvedTable")

	partitions, err := t.Table.Partitions(ctx)
	if err != nil {
		span.Finish()
		return nil, err
	}

	return sql.NewSpanIter(span, sql.NewTableRowIter(ctx, t.Table, partitions)), nil
}

// WithChildren implements the Node interface.
func (t *ResolvedTable) WithChildren(children ...sql.Node) (sql.Node, error) {
	if len(children) != 0 {
		return nil, sql.ErrInvalidChildrenNumber.New(t, len(children), 0)
	}

	return t, nil
}

// WithTable returns this Node with the given table. The new table should have the same name as the previous table.
func (t *ResolvedTable) WithTable(table sql.Table) (*ResolvedTable, error) {
	if t.Name() != table.Name() {
		return nil, fmt.Errorf("attempted to update ResolvedTable `%s` with table `%s`", t.Name(), table.Name())
	}
	nt := *t
	nt.Table = table
	return &nt, nil
}