// Copyright 2019 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 aggfuncs import ( "github.com/pingcap/tidb/sessionctx" "github.com/pingcap/tidb/util/chunk" ) type rowNumber struct { baseAggFunc } type partialResult4RowNumber struct { curIdx int64 } func (rn *rowNumber) AllocPartialResult() PartialResult { return PartialResult(&partialResult4RowNumber{}) } func (rn *rowNumber) ResetPartialResult(pr PartialResult) { p := (*partialResult4RowNumber)(pr) p.curIdx = 0 } func (rn *rowNumber) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { return nil } func (rn *rowNumber) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { p := (*partialResult4RowNumber)(pr) p.curIdx++ chk.AppendInt64(rn.ordinal, p.curIdx) return nil }