func (e *XSelectIndexExec) doIndexRequest() (*xapi.SelectResult, error) {
txn, err := e.ctx.GetTxn(false)
if err != nil {
return nil, errors.Trace(err)
}
selIdxReq := new(tipb.SelectRequest)
startTs := txn.StartTS()
selIdxReq.StartTs = &startTs
selIdxReq.IndexInfo = xapi.IndexToProto(e.table.Meta(), e.indexPlan.Index)
if len(e.indexPlan.FilterConditions) == 0 {
// Push limit to index request only if there is not filter conditions.
selIdxReq.Limit = e.indexPlan.LimitCount
}
if e.indexPlan.Desc {
selIdxReq.OrderBy = append(selIdxReq.OrderBy, &tipb.ByItem{Desc: &e.indexPlan.Desc})
}
fieldTypes := make([]*types.FieldType, len(e.indexPlan.Index.Columns))
for i, v := range e.indexPlan.Index.Columns {
fieldTypes[i] = &(e.table.Cols()[v.Offset].FieldType)
}
selIdxReq.Ranges, err = indexRangesToPBRanges(e.indexPlan.Ranges, fieldTypes)
if err != nil {
return nil, errors.Trace(err)
}
concurrency := 1
if e.indexPlan.OutOfOrder {
concurrency = 10
}
return xapi.Select(txn.GetClient(), selIdxReq, concurrency)
}
func (e *XSelectIndexExec) doIndexRequest() (xapi.SelectResult, error) {
selIdxReq := new(tipb.SelectRequest)
selIdxReq.StartTs = e.txn.StartTS()
selIdxReq.IndexInfo = xapi.IndexToProto(e.table.Meta(), e.indexPlan.Index)
if e.indexPlan.Desc {
selIdxReq.OrderBy = append(selIdxReq.OrderBy, &tipb.ByItem{Desc: e.indexPlan.Desc})
}
fieldTypes := make([]*types.FieldType, len(e.indexPlan.Index.Columns))
for i, v := range e.indexPlan.Index.Columns {
fieldTypes[i] = &(e.table.Cols()[v.Offset].FieldType)
}
if !e.indexPlan.DoubleRead || e.where == nil {
// TODO: when where condition is all index columns limit can be pushed too.
selIdxReq.Limit = e.indexPlan.LimitCount
}
concurrency := 1
if !e.indexPlan.DoubleRead {
concurrency = defaultConcurrency
selIdxReq.Aggregates = e.aggFuncs
selIdxReq.GroupBy = e.byItems
selIdxReq.Where = e.where
} else if e.indexPlan.OutOfOrder {
concurrency = defaultConcurrency
}
keyRanges, err := indexRangesToKVRanges(e.table.Meta().ID, e.indexPlan.Index.ID, e.indexPlan.Ranges, fieldTypes)
if err != nil {
return nil, errors.Trace(err)
}
return xapi.Select(e.txn.GetClient(), selIdxReq, keyRanges, concurrency, !e.indexPlan.OutOfOrder)
}