/
create_index.go
498 lines (420 loc) · 10.9 KB
/
create_index.go
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// 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"
"strings"
"time"
opentracing "github.com/opentracing/opentracing-go"
otlog "github.com/opentracing/opentracing-go/log"
"github.com/sirupsen/logrus"
errors "gopkg.in/src-d/go-errors.v1"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/expression"
)
var (
// ErrNotIndexable is returned when the table is not indexable.
ErrNotIndexable = errors.NewKind("the table is not indexable")
// ErrInvalidIndexDriver is returned when the index driver can't be found.
ErrInvalidIndexDriver = errors.NewKind("invalid driver index %q")
// ErrExprTypeNotIndexable is returned when the expression type cannot be
// indexed, such as BLOB or JSON.
ErrExprTypeNotIndexable = errors.NewKind("expression %q with type %s cannot be indexed")
)
// CreateIndex is a node to create an index.
type CreateIndex struct {
Name string
Table sql.Node
Exprs []sql.Expression
Driver string
Config map[string]string
Catalog sql.Catalog
CurrentDatabase string
}
// NewCreateIndex creates a new CreateIndex node.
func NewCreateIndex(
name string,
table sql.Node,
exprs []sql.Expression,
driver string,
config map[string]string,
) *CreateIndex {
return &CreateIndex{
Name: name,
Table: table,
Exprs: exprs,
Driver: driver,
Config: config,
}
}
// Children implements the Node interface.
func (c *CreateIndex) Children() []sql.Node { return []sql.Node{c.Table} }
// Resolved implements the Node interface.
func (c *CreateIndex) Resolved() bool {
if !c.Table.Resolved() {
return false
}
for _, e := range c.Exprs {
if !e.Resolved() {
return false
}
}
return true
}
func getIndexableTable(t sql.Table) (sql.DriverIndexableTable, error) {
switch t := t.(type) {
case sql.DriverIndexableTable:
return t, nil
case sql.TableWrapper:
return getIndexableTable(t.Underlying())
default:
return nil, ErrNotIndexable.New()
}
}
func getChecksumable(t sql.Table) sql.Checksumable {
switch t := t.(type) {
case sql.Checksumable:
return t
case sql.TableWrapper:
return getChecksumable(t.Underlying())
default:
return nil
}
}
// RowIter implements the Node interface.
func (c *CreateIndex) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
table, ok := c.Table.(*ResolvedTable)
if !ok {
return nil, ErrNotIndexable.New()
}
indexable, err := getIndexableTable(table.Table)
if err != nil {
return nil, err
}
var driver sql.IndexDriver
if c.Driver == "" {
driver = ctx.GetIndexRegistry().DefaultIndexDriver()
} else {
driver = ctx.GetIndexRegistry().IndexDriver(c.Driver)
}
if driver == nil {
return nil, ErrInvalidIndexDriver.New(c.Driver)
}
columns, exprs, err := GetColumnsAndPrepareExpressions(ctx, c.Exprs)
if err != nil {
return nil, err
}
for _, e := range exprs {
if sql.IsBlob(e.Type()) || sql.IsJSON(e.Type()) {
return nil, ErrExprTypeNotIndexable.New(e, e.Type())
}
}
if ch := getChecksumable(table.Table); ch != nil {
c.Config[sql.ChecksumKey], err = ch.Checksum()
if err != nil {
return nil, err
}
}
index, err := driver.Create(
c.CurrentDatabase,
table.Name(),
c.Name,
exprs,
c.Config,
)
if err != nil {
return nil, err
}
iter, err := indexable.IndexKeyValues(ctx, columns)
if err != nil {
return nil, err
}
iter = &EvalPartitionKeyValueIter{
ctx: ctx,
columns: columns,
exprs: exprs,
iter: iter,
}
created, ready, err := ctx.GetIndexRegistry().AddIndex(index)
if err != nil {
return nil, err
}
log := logrus.WithFields(logrus.Fields{
"id": index.ID(),
"driver": index.Driver(),
})
createIndex := func() {
c.createIndex(ctx, log, driver, index, iter, created, ready)
}
log.Info("starting to save the index")
createIndex()
return sql.RowsToRowIter(), nil
}
func (c *CreateIndex) createIndex(
ctx *sql.Context,
log *logrus.Entry,
driver sql.IndexDriver,
index sql.DriverIndex,
iter sql.PartitionIndexKeyValueIter,
done chan<- struct{},
ready <-chan struct{},
) {
span, ctx := ctx.Span("plan.createIndex",
opentracing.Tags{
"index": index.ID(),
"table": index.Table(),
"driver": index.Driver(),
})
l := log.WithField("id", index.ID())
err := driver.Save(ctx, index, newLoggingPartitionKeyValueIter(ctx, l, iter))
close(done)
if err != nil {
span.FinishWithOptions(opentracing.FinishOptions{
LogRecords: []opentracing.LogRecord{
{
Timestamp: time.Now(),
Fields: []otlog.Field{
otlog.String("error", err.Error()),
},
},
},
})
ctx.Error(0, "unable to save the index: %s", err)
logrus.WithField("err", err).Error("unable to save the index")
deleted, err := ctx.GetIndexRegistry().DeleteIndex(index.Database(), index.ID(), true)
if err != nil {
ctx.Error(0, "unable to delete index: %s", err)
logrus.WithField("err", err).Error("unable to delete the index")
} else {
<-deleted
}
} else {
<-ready
span.Finish()
log.Info("index successfully created")
}
}
// Schema implements the Node interface.
func (c *CreateIndex) Schema() sql.Schema { return nil }
func (c *CreateIndex) String() string {
var exprs = make([]string, len(c.Exprs))
for i, e := range c.Exprs {
exprs[i] = e.String()
}
pr := sql.NewTreePrinter()
_ = pr.WriteNode("CreateIndex(%s)", c.Name)
_ = pr.WriteChildren(
fmt.Sprintf("USING %s", c.Driver),
fmt.Sprintf("Expressions (%s)", strings.Join(exprs, ", ")),
c.Table.String(),
)
return pr.String()
}
// Expressions implements the Expressioner interface.
func (c *CreateIndex) Expressions() []sql.Expression {
return c.Exprs
}
// WithExpressions implements the Expressioner interface.
func (c *CreateIndex) WithExpressions(exprs ...sql.Expression) (sql.Node, error) {
if len(exprs) != len(c.Exprs) {
return nil, sql.ErrInvalidChildrenNumber.New(c, len(exprs), len(c.Exprs))
}
nc := *c
nc.Exprs = exprs
return &nc, nil
}
// WithChildren implements the Node interface.
func (c *CreateIndex) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(c, len(children), 1)
}
nc := *c
nc.Table = children[0]
return &nc, nil
}
// GetColumnsAndPrepareExpressions extracts the unique columns required by all
// those expressions and fixes the indexes of the GetFields in the expressions
// to match a row with only the returned columns in that same order.
func GetColumnsAndPrepareExpressions(
ctx *sql.Context,
exprs []sql.Expression,
) ([]string, []sql.Expression, error) {
var columns []string
var seen = make(map[string]int)
var expressions = make([]sql.Expression, len(exprs))
for i, e := range exprs {
ex, err := expression.TransformUp(e, func(e sql.Expression) (sql.Expression, error) {
gf, ok := e.(*expression.GetField)
if !ok {
return e, nil
}
var idx int
if j, ok := seen[gf.Name()]; ok {
idx = j
} else {
idx = len(columns)
columns = append(columns, gf.Name())
seen[gf.Name()] = idx
}
return expression.NewGetFieldWithTable(
idx,
gf.Type(),
gf.Table(),
gf.Name(),
gf.IsNullable(),
), nil
})
if err != nil {
return nil, nil, err
}
expressions[i] = ex
}
return columns, expressions, nil
}
type EvalPartitionKeyValueIter struct {
iter sql.PartitionIndexKeyValueIter
columns []string
exprs []sql.Expression
ctx *sql.Context
}
func NewEvalPartitionKeyValueIter(ctx *sql.Context, iter sql.PartitionIndexKeyValueIter, columns []string, exprs []sql.Expression) *EvalPartitionKeyValueIter {
return &EvalPartitionKeyValueIter{
ctx: ctx,
iter: iter,
columns: columns,
exprs: exprs,
}
}
func (i *EvalPartitionKeyValueIter) Next() (sql.Partition, sql.IndexKeyValueIter, error) {
p, iter, err := i.iter.Next()
if err != nil {
return nil, nil, err
}
return p, &evalKeyValueIter{
ctx: i.ctx,
columns: i.columns,
exprs: i.exprs,
iter: iter,
}, nil
}
func (i *EvalPartitionKeyValueIter) Close(ctx *sql.Context) error {
return i.iter.Close(ctx)
}
type evalKeyValueIter struct {
ctx *sql.Context
iter sql.IndexKeyValueIter
columns []string
exprs []sql.Expression
}
func (i *evalKeyValueIter) Next() ([]interface{}, []byte, error) {
vals, loc, err := i.iter.Next()
if err != nil {
return nil, nil, err
}
row := sql.NewRow(vals...)
evals := make([]interface{}, len(i.exprs))
for j, ex := range i.exprs {
eval, err := ex.Eval(i.ctx, row)
if err != nil {
return nil, nil, err
}
evals[j] = eval
}
return evals, loc, nil
}
func (i *evalKeyValueIter) Close(ctx *sql.Context) error {
return i.iter.Close(ctx)
}
type loggingPartitionKeyValueIter struct {
ctx *sql.Context
log *logrus.Entry
iter sql.PartitionIndexKeyValueIter
rows uint64
}
func newLoggingPartitionKeyValueIter(
ctx *sql.Context,
log *logrus.Entry,
iter sql.PartitionIndexKeyValueIter,
) *loggingPartitionKeyValueIter {
return &loggingPartitionKeyValueIter{
ctx: ctx,
log: log,
iter: iter,
}
}
func (i *loggingPartitionKeyValueIter) Next() (sql.Partition, sql.IndexKeyValueIter, error) {
p, iter, err := i.iter.Next()
if err != nil {
return nil, nil, err
}
return p, newLoggingKeyValueIter(i.ctx, i.log, iter, &i.rows), nil
}
func (i *loggingPartitionKeyValueIter) Close(ctx *sql.Context) error {
return i.iter.Close(ctx)
}
type loggingKeyValueIter struct {
ctx *sql.Context
span opentracing.Span
log *logrus.Entry
iter sql.IndexKeyValueIter
rows *uint64
start time.Time
}
func newLoggingKeyValueIter(
ctx *sql.Context,
log *logrus.Entry,
iter sql.IndexKeyValueIter,
rows *uint64,
) *loggingKeyValueIter {
return &loggingKeyValueIter{
ctx: ctx,
log: log,
iter: iter,
start: time.Now(),
rows: rows,
}
}
func (i *loggingKeyValueIter) Next() ([]interface{}, []byte, error) {
if i.span == nil {
i.span, _ = i.ctx.Span("plan.createIndex.iterator",
opentracing.Tags{
"start": i.rows,
},
)
}
(*i.rows)++
if *i.rows%sql.IndexBatchSize == 0 {
duration := time.Since(i.start)
i.log.WithFields(logrus.Fields{
"duration": duration,
"rows": *i.rows,
}).Debugf("still creating index")
if i.span != nil {
i.span.LogKV("duration", duration.String())
i.span.Finish()
i.span = nil
}
i.start = time.Now()
}
val, loc, err := i.iter.Next()
if err != nil {
i.span.LogKV("error", err)
i.span.Finish()
i.span = nil
}
return val, loc, err
}
func (i *loggingKeyValueIter) Close(ctx *sql.Context) error {
return i.iter.Close(ctx)
}