57 lines
1.5 KiB
Go
57 lines
1.5 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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// 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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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/util/chunk"
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)
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type cumeDist struct {
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baseAggFunc
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rowComparer
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}
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type partialResult4CumeDist struct {
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partialResult4Rank
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cum int64
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}
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func (r *cumeDist) AllocPartialResult() PartialResult {
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return PartialResult(&partialResult4CumeDist{})
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}
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func (r *cumeDist) ResetPartialResult(pr PartialResult) {
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p := (*partialResult4CumeDist)(pr)
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p.partialResult4Rank.reset()
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p.cum = 0
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}
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func (r *cumeDist) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
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p := (*partialResult4CumeDist)(pr)
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p.partialResult4Rank.updatePartialResult(rowsInGroup, false, r.compareRows)
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return nil
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}
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func (r *cumeDist) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
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p := (*partialResult4CumeDist)(pr)
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numRows := int64(len(p.results))
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for p.cum < numRows && p.results[p.cum] == p.results[p.curIdx] {
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p.cum++
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}
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p.curIdx++
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chk.AppendFloat64(r.ordinal, float64(p.cum)/float64(numRows))
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return nil
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}
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