32b1dbd8d5
We import "github.com/pkg/errors" in the code, and actually put the "github.com/pingcap/errors" there in the vendor path. That's a dirty hack, and prevent the introduce of Go module.
113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
// Copyright 2018 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 decoder
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import (
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"time"
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"github.com/pingcap/errors"
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"github.com/pingcap/parser/model"
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"github.com/pingcap/parser/mysql"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/table"
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"github.com/pingcap/tidb/tablecodec"
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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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// Column contains the info and generated expr of column.
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type Column struct {
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Info *model.ColumnInfo
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GenExpr expression.Expression
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}
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// RowDecoder decodes a byte slice into datums and eval the generated column value.
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type RowDecoder struct {
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mutRow chunk.MutRow
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columns map[int64]Column
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colTypes map[int64]*types.FieldType
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haveGenColumn bool
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}
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// NewRowDecoder returns a new RowDecoder.
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func NewRowDecoder(cols []*table.Column, decodeColMap map[int64]Column) RowDecoder {
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colFieldMap := make(map[int64]*types.FieldType, len(decodeColMap))
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haveGenCol := false
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for id, col := range decodeColMap {
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colFieldMap[id] = &col.Info.FieldType
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if col.GenExpr != nil {
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haveGenCol = true
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}
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}
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if !haveGenCol {
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return RowDecoder{
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colTypes: colFieldMap,
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}
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}
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tps := make([]*types.FieldType, len(cols))
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for _, col := range cols {
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tps[col.Offset] = &col.FieldType
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}
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return RowDecoder{
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mutRow: chunk.MutRowFromTypes(tps),
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columns: decodeColMap,
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colTypes: colFieldMap,
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haveGenColumn: haveGenCol,
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}
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}
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// DecodeAndEvalRowWithMap decodes a byte slice into datums and evaluates the generated column value.
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func (rd RowDecoder) DecodeAndEvalRowWithMap(ctx sessionctx.Context, b []byte, decodeLoc, sysLoc *time.Location, row map[int64]types.Datum) (map[int64]types.Datum, error) {
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row, err := tablecodec.DecodeRowWithMap(b, rd.colTypes, decodeLoc, row)
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if err != nil {
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return nil, errors.Trace(err)
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}
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if !rd.haveGenColumn {
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return row, nil
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}
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for id, v := range row {
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rd.mutRow.SetValue(rd.columns[id].Info.Offset, v.GetValue())
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}
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for id, col := range rd.columns {
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if col.GenExpr == nil {
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continue
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}
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// Eval the column value
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val, err := col.GenExpr.Eval(rd.mutRow.ToRow())
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if err != nil {
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return nil, errors.Trace(err)
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}
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val, err = table.CastValue(ctx, val, col.Info)
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if err != nil {
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return nil, errors.Trace(err)
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}
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if val.Kind() == types.KindMysqlTime && sysLoc != time.UTC {
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t := val.GetMysqlTime()
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if t.Type == mysql.TypeTimestamp {
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err := t.ConvertTimeZone(sysLoc, time.UTC)
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if err != nil {
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return nil, errors.Trace(err)
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}
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val.SetMysqlTime(t)
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}
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}
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row[id] = val
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}
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return row, nil
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}
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