tidb vectorized 源码
tidb vectorized 代码
文件路径：/expression/vectorized.go
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expression
import (
"github.com/pingcap/errors"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
)
func genVecFromConstExpr(ctx sessionctx.Context, expr Expression, targetType types.EvalType, input *chunk.Chunk, result *chunk.Column) error {
n := 1
if input != nil {
n = input.NumRows()
if n == 0 {
result.Reset(targetType)
return nil
}
}
switch targetType {
case types.ETInt:
v, isNull, err := expr.EvalInt(ctx, chunk.Row{})
if err != nil {
return err
}
if isNull {
result.ResizeInt64(n, true)
return nil
}
result.ResizeInt64(n, false)
i64s := result.Int64s()
for i := range i64s {
i64s[i] = v
}
case types.ETReal:
v, isNull, err := expr.EvalReal(ctx, chunk.Row{})
if err != nil {
return err
}
if isNull {
result.ResizeFloat64(n, true)
return nil
}
result.ResizeFloat64(n, false)
f64s := result.Float64s()
for i := range f64s {
f64s[i] = v
}
case types.ETDecimal:
v, isNull, err := expr.EvalDecimal(ctx, chunk.Row{})
if err != nil {
return err
}
if isNull {
result.ResizeDecimal(n, true)
return nil
}
result.ResizeDecimal(n, false)
ds := result.Decimals()
for i := range ds {
ds[i] = *v
}
case types.ETDatetime, types.ETTimestamp:
v, isNull, err := expr.EvalTime(ctx, chunk.Row{})
if err != nil {
return err
}
if isNull {
result.ResizeTime(n, true)
return nil
}
result.ResizeTime(n, false)
ts := result.Times()
for i := range ts {
ts[i] = v
}
case types.ETDuration:
v, isNull, err := expr.EvalDuration(ctx, chunk.Row{})
if err != nil {
return err
}
if isNull {
result.ResizeGoDuration(n, true)
return nil
}
result.ResizeGoDuration(n, false)
ds := result.GoDurations()
for i := range ds {
ds[i] = v.Duration
}
case types.ETJson:
result.ReserveJSON(n)
v, isNull, err := expr.EvalJSON(ctx, chunk.Row{})
if err != nil {
return err
}
if isNull {
for i := 0; i < n; i++ {
result.AppendNull()
}
} else {
for i := 0; i < n; i++ {
result.AppendJSON(v)
}
}
case types.ETString:
result.ReserveString(n)
v, isNull, err := expr.EvalString(ctx, chunk.Row{})
if err != nil {
return err
}
if isNull {
for i := 0; i < n; i++ {
result.AppendNull()
}
} else {
for i := 0; i < n; i++ {
result.AppendString(v)
}
}
default:
return errors.Errorf("unsupported Constant type for vectorized evaluation")
}
return nil
}
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