137 lines
2.9 KiB
Go
137 lines
2.9 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 expression
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import (
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util/chunk"
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)
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func genVecFromConstExpr(ctx sessionctx.Context, expr Expression, input *chunk.Chunk, result *chunk.Column) error {
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n := input.NumRows()
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tp := expr.GetType()
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switch tp.EvalType() {
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case types.ETInt:
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result.ResizeInt64(n)
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v, isNull, err := expr.EvalInt(ctx, chunk.Row{})
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if err != nil {
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return err
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}
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if isNull {
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result.SetNulls(0, n, true)
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return nil
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}
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i64s := result.Int64s()
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for i := range i64s {
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i64s[i] = v
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}
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result.SetNulls(0, n, false)
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case types.ETReal:
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result.ResizeFloat64(n)
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v, isNull, err := expr.EvalReal(ctx, chunk.Row{})
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if err != nil {
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return err
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}
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if isNull {
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result.SetNulls(0, n, true)
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return nil
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}
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f64s := result.Float64s()
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for i := range f64s {
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f64s[i] = v
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}
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result.SetNulls(0, n, false)
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case types.ETDecimal:
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result.ResizeDecimal(n)
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v, isNull, err := expr.EvalDecimal(ctx, chunk.Row{})
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if err != nil {
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return err
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}
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if isNull {
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result.SetNulls(0, n, true)
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return nil
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}
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ds := result.Decimals()
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for i := range ds {
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ds[i] = *v
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}
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result.SetNulls(0, n, false)
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case types.ETDatetime, types.ETTimestamp:
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result.Reset()
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v, isNull, err := expr.EvalTime(ctx, chunk.Row{})
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if err != nil {
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return err
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}
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if isNull {
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for i := 0; i < n; i++ {
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result.AppendNull()
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}
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} else {
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for i := 0; i < n; i++ {
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result.AppendTime(v)
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}
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}
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case types.ETDuration:
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result.ResizeDuration(n)
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v, isNull, err := expr.EvalDuration(ctx, chunk.Row{})
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if err != nil {
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return err
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}
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if isNull {
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for i := 0; i < n; i++ {
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result.AppendNull()
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}
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} else {
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for i := 0; i < n; i++ {
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result.AppendDuration(v)
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}
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}
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case types.ETJson:
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result.ReserveJSON(n)
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v, isNull, err := expr.EvalJSON(ctx, chunk.Row{})
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if err != nil {
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return err
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}
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if isNull {
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for i := 0; i < n; i++ {
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result.AppendNull()
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}
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} else {
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for i := 0; i < n; i++ {
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result.AppendJSON(v)
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}
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}
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case types.ETString:
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result.ReserveString(n)
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v, isNull, err := expr.EvalString(ctx, chunk.Row{})
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if err != nil {
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return err
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}
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if isNull {
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for i := 0; i < n; i++ {
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result.AppendNull()
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}
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} else {
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for i := 0; i < n; i++ {
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result.AppendString(v)
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}
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}
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default:
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return errors.Errorf("unsupported Constant type for vectorized evaluation")
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}
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return nil
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}
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