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plan_to_pb.go
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plan_to_pb.go
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// Copyright 2017 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package plan
import (
"github.com/juju/errors"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/expression/aggregation"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/tablecodec"
"github.com/pingcap/tidb/util/ranger"
"github.com/pingcap/tipb/go-tipb"
)
// ToPB implements PhysicalPlan ToPB interface.
func (p *basePhysicalPlan) ToPB(_ sessionctx.Context) (*tipb.Executor, error) {
return nil, errors.Errorf("plan %s fails converts to PB", p.basePlan.ExplainID())
}
// ToPB implements PhysicalPlan ToPB interface.
func (p *PhysicalHashAgg) ToPB(ctx sessionctx.Context) (*tipb.Executor, error) {
sc := ctx.GetSessionVars().StmtCtx
client := ctx.GetClient()
aggExec := &tipb.Aggregation{
GroupBy: expression.ExpressionsToPBList(sc, p.GroupByItems, client),
}
for _, aggFunc := range p.AggFuncs {
aggExec.AggFunc = append(aggExec.AggFunc, aggregation.AggFuncToPBExpr(sc, client, aggFunc))
}
return &tipb.Executor{Tp: tipb.ExecType_TypeAggregation, Aggregation: aggExec}, nil
}
// ToPB implements PhysicalPlan ToPB interface.
func (p *PhysicalStreamAgg) ToPB(ctx sessionctx.Context) (*tipb.Executor, error) {
sc := ctx.GetSessionVars().StmtCtx
client := ctx.GetClient()
aggExec := &tipb.Aggregation{
GroupBy: expression.ExpressionsToPBList(sc, p.GroupByItems, client),
}
for _, aggFunc := range p.AggFuncs {
aggExec.AggFunc = append(aggExec.AggFunc, aggregation.AggFuncToPBExpr(sc, client, aggFunc))
}
return &tipb.Executor{Tp: tipb.ExecType_TypeStreamAgg, Aggregation: aggExec}, nil
}
// ToPB implements PhysicalPlan ToPB interface.
func (p *PhysicalSelection) ToPB(ctx sessionctx.Context) (*tipb.Executor, error) {
sc := ctx.GetSessionVars().StmtCtx
client := ctx.GetClient()
selExec := &tipb.Selection{
Conditions: expression.ExpressionsToPBList(sc, p.Conditions, client),
}
return &tipb.Executor{Tp: tipb.ExecType_TypeSelection, Selection: selExec}, nil
}
// ToPB implements PhysicalPlan ToPB interface.
func (p *PhysicalTopN) ToPB(ctx sessionctx.Context) (*tipb.Executor, error) {
sc := ctx.GetSessionVars().StmtCtx
client := ctx.GetClient()
topNExec := &tipb.TopN{
Limit: p.Count,
}
for _, item := range p.ByItems {
topNExec.OrderBy = append(topNExec.OrderBy, expression.SortByItemToPB(sc, client, item.Expr, item.Desc))
}
return &tipb.Executor{Tp: tipb.ExecType_TypeTopN, TopN: topNExec}, nil
}
// ToPB implements PhysicalPlan ToPB interface.
func (p *PhysicalLimit) ToPB(ctx sessionctx.Context) (*tipb.Executor, error) {
limitExec := &tipb.Limit{
Limit: p.Count,
}
return &tipb.Executor{Tp: tipb.ExecType_TypeLimit, Limit: limitExec}, nil
}
// ToPB implements PhysicalPlan ToPB interface.
func (p *PhysicalTableScan) ToPB(ctx sessionctx.Context) (*tipb.Executor, error) {
columns := p.Columns
tsExec := &tipb.TableScan{
TableId: p.Table.ID,
Columns: ColumnsToProto(columns, p.Table.PKIsHandle),
Desc: p.Desc,
}
err := setPBColumnsDefaultValue(ctx, tsExec.Columns, p.Columns)
return &tipb.Executor{Tp: tipb.ExecType_TypeTableScan, TblScan: tsExec}, errors.Trace(err)
}
// checkCoverIndex checks whether we can pass unique info to TiKV. We should push it if and only if the length of
// range and index are equal.
func checkCoverIndex(idx *model.IndexInfo, ranges []*ranger.NewRange) bool {
// If the index is (c1, c2) but the query range only contains c1, it is not a unique get.
if !idx.Unique {
return false
}
for _, rg := range ranges {
if len(rg.LowVal) != len(idx.Columns) {
return false
}
}
return true
}
// ToPB implements PhysicalPlan ToPB interface.
func (p *PhysicalIndexScan) ToPB(ctx sessionctx.Context) (*tipb.Executor, error) {
columns := make([]*model.ColumnInfo, 0, p.schema.Len())
tableColumns := p.Table.Cols()
for _, col := range p.schema.Columns {
if col.ID == model.ExtraHandleID {
columns = append(columns, &model.ColumnInfo{
ID: model.ExtraHandleID,
Name: model.NewCIStr("_rowid"),
})
} else {
columns = append(columns, tableColumns[col.Position])
}
}
idxExec := &tipb.IndexScan{
TableId: p.Table.ID,
IndexId: p.Index.ID,
Columns: ColumnsToProto(columns, p.Table.PKIsHandle),
Desc: p.Desc,
}
unique := checkCoverIndex(p.Index, p.Ranges)
idxExec.Unique = &unique
return &tipb.Executor{Tp: tipb.ExecType_TypeIndexScan, IdxScan: idxExec}, nil
}
func setPBColumnsDefaultValue(ctx sessionctx.Context, pbColumns []*tipb.ColumnInfo, columns []*model.ColumnInfo) error {
for i, c := range columns {
if c.OriginDefaultValue == nil {
continue
}
sessVars := ctx.GetSessionVars()
originStrict := sessVars.StrictSQLMode
sessVars.StrictSQLMode = false
d, err := table.GetColOriginDefaultValue(ctx, c)
sessVars.StrictSQLMode = originStrict
if err != nil {
return errors.Trace(err)
}
pbColumns[i].DefaultVal, err = tablecodec.EncodeValue(ctx.GetSessionVars().StmtCtx, d)
if err != nil {
return errors.Trace(err)
}
}
return nil
}
// ColumnsToProto converts a slice of model.ColumnInfo to a slice of tipb.ColumnInfo.
func ColumnsToProto(columns []*model.ColumnInfo, pkIsHandle bool) []*tipb.ColumnInfo {
cols := make([]*tipb.ColumnInfo, 0, len(columns))
for _, c := range columns {
col := columnToProto(c)
// TODO: Here `PkHandle`'s meaning is changed, we will change it to `IsHandle` when tikv's old select logic
// is abandoned.
if (pkIsHandle && mysql.HasPriKeyFlag(c.Flag)) || c.ID == model.ExtraHandleID {
col.PkHandle = true
} else {
col.PkHandle = false
}
cols = append(cols, col)
}
return cols
}
// IndexToProto converts a model.IndexInfo to a tipb.IndexInfo.
func IndexToProto(t *model.TableInfo, idx *model.IndexInfo) *tipb.IndexInfo {
pi := &tipb.IndexInfo{
TableId: t.ID,
IndexId: idx.ID,
Unique: idx.Unique,
}
cols := make([]*tipb.ColumnInfo, 0, len(idx.Columns)+1)
for _, c := range idx.Columns {
cols = append(cols, columnToProto(t.Columns[c.Offset]))
}
if t.PKIsHandle {
// Coprocessor needs to know PKHandle column info, so we need to append it.
for _, col := range t.Columns {
if mysql.HasPriKeyFlag(col.Flag) {
colPB := columnToProto(col)
colPB.PkHandle = true
cols = append(cols, colPB)
break
}
}
}
pi.Columns = cols
return pi
}
func columnToProto(c *model.ColumnInfo) *tipb.ColumnInfo {
pc := &tipb.ColumnInfo{
ColumnId: c.ID,
Collation: collationToProto(c.FieldType.Collate),
ColumnLen: int32(c.FieldType.Flen),
Decimal: int32(c.FieldType.Decimal),
Flag: int32(c.Flag),
Elems: c.Elems,
}
pc.Tp = int32(c.FieldType.Tp)
return pc
}
// TODO: update it when more collate is supported.
func collationToProto(c string) int32 {
v := mysql.CollationNames[c]
if v == mysql.BinaryCollationID {
return int32(mysql.BinaryCollationID)
}
// We only support binary and utf8_bin collation.
// Setting other collations to utf8_bin for old data compatibility.
// For the data created when we didn't enforce utf8_bin collation in create table.
return int32(mysql.DefaultCollationID)
}