61 lines
1.7 KiB
Go
61 lines
1.7 KiB
Go
// Copyright 2019 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package aggfuncs
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import (
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"unsafe"
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"github.com/pingcap/tidb/pkg/util/chunk"
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)
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const (
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// DefPartialResult4RowNumberSize is the size of partialResult4RowNumberSize
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DefPartialResult4RowNumberSize = int64(unsafe.Sizeof(partialResult4RowNumber{}))
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)
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type rowNumber struct {
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baseAggFunc
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}
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type partialResult4RowNumber struct {
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curIdx int64
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}
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func (*rowNumber) AllocPartialResult() (pr PartialResult, memDelta int64) {
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return PartialResult(&partialResult4RowNumber{}), DefPartialResult4RowNumberSize
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}
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func (*rowNumber) ResetPartialResult(pr PartialResult) {
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p := (*partialResult4RowNumber)(pr)
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p.curIdx = 0
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}
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func (*rowNumber) UpdatePartialResult(_ AggFuncUpdateContext, _ []chunk.Row, _ PartialResult) (memDelta int64, err error) {
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return 0, nil
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}
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func (rn *rowNumber) AppendFinalResult2Chunk(_ AggFuncUpdateContext, pr PartialResult, chk *chunk.Chunk) error {
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p := (*partialResult4RowNumber)(pr)
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p.curIdx++
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chk.AppendInt64(rn.ordinal, p.curIdx)
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return nil
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}
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var _ SlidingWindowAggFunc = &rowNumber{}
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func (*rowNumber) Slide(_ AggFuncUpdateContext, _ func(uint64) chunk.Row, _, _, _, _ uint64, _ PartialResult) error {
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return nil
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}
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