137 lines
3.6 KiB
Go
137 lines
3.6 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/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/table/tables"
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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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Col *table.Column
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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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tbl table.Table
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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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defaultVals []types.Datum
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}
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// NewRowDecoder returns a new RowDecoder.
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func NewRowDecoder(tbl table.Table, 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.Col.ColumnInfo.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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cols := tbl.Cols()
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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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tbl: tbl,
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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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defaultVals: make([]types.Datum, len(cols)),
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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, handle int64, 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, 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 _, dCol := range rd.columns {
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colInfo := dCol.Col.ColumnInfo
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val, ok := row[colInfo.ID]
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if ok || dCol.GenExpr != nil {
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rd.mutRow.SetValue(colInfo.Offset, val.GetValue())
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continue
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}
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// Get the default value of the column in the generated column expression.
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if dCol.Col.IsPKHandleColumn(rd.tbl.Meta()) {
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if mysql.HasUnsignedFlag(colInfo.Flag) {
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val.SetUint64(uint64(handle))
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} else {
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val.SetInt64(handle)
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}
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} else {
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val, err = tables.GetColDefaultValue(ctx, dCol.Col, rd.defaultVals)
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if err != nil {
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return nil, err
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}
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}
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rd.mutRow.SetValue(colInfo.Offset, val.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, err
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}
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val, err = table.CastValue(ctx, val, col.Col.ColumnInfo)
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if err != nil {
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return nil, 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, 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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