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241 lines
8.0 KiB
241 lines
8.0 KiB
// Copyright 2016 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 executor
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import (
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"context"
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"strings"
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"github.com/opentracing/opentracing-go"
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"github.com/pingcap/parser/ast"
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"github.com/pingcap/parser/charset"
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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/meta/autoid"
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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/logutil"
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"github.com/pingcap/tidb/util/memory"
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"go.uber.org/zap"
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)
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var (
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_ Executor = &UpdateExec{}
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_ Executor = &DeleteExec{}
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_ Executor = &InsertExec{}
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_ Executor = &ReplaceExec{}
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_ Executor = &LoadDataExec{}
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)
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// updateRecord updates the row specified by the handle `h`, from `oldData` to `newData`.
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// `modified` means which columns are really modified. It's used for secondary indices.
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// Length of `oldData` and `newData` equals to length of `t.WritableCols()`.
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// The return values:
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// 1. changed (bool) : does the update really change the row values. e.g. update set i = 1 where i = 1;
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// 2. handleChanged (bool) : is the handle changed after the update.
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// 3. newHandle (int64) : if handleChanged == true, the newHandle means the new handle after update.
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// 4. err (error) : error in the update.
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func updateRecord(ctx context.Context, sctx sessionctx.Context, h int64, oldData, newData []types.Datum, modified []bool, t table.Table,
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onDup bool, memTracker *memory.Tracker) (bool, bool, int64, error) {
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if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
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span1 := span.Tracer().StartSpan("executor.updateRecord", opentracing.ChildOf(span.Context()))
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defer span1.Finish()
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ctx = opentracing.ContextWithSpan(ctx, span1)
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}
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txn, err := sctx.Txn(false)
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if err != nil {
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return false, false, 0, err
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}
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memUsageOfTxnState := txn.Size()
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defer memTracker.Consume(int64(txn.Size() - memUsageOfTxnState))
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sc := sctx.GetSessionVars().StmtCtx
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changed, handleChanged := false, false
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// onUpdateSpecified is for "UPDATE SET ts_field = old_value", the
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// timestamp field is explicitly set, but not changed in fact.
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onUpdateSpecified := make(map[int]bool)
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var newHandle int64
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// We can iterate on public columns not writable columns,
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// because all of them are sorted by their `Offset`, which
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// causes all writable columns are after public columns.
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// 1. Cast modified values.
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for i, col := range t.Cols() {
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if modified[i] {
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// Cast changed fields with respective columns.
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v, err := table.CastValue(sctx, newData[i], col.ToInfo(), false, false)
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if err != nil {
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return false, false, 0, err
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}
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newData[i] = v
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}
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}
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// 2. Handle the bad null error.
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for i, col := range t.Cols() {
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var err error
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if newData[i], err = col.HandleBadNull(newData[i], sc); err != nil {
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return false, false, 0, err
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}
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}
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// 3. Compare datum, then handle some flags.
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for i, col := range t.Cols() {
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collation := newData[i].Collation()
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// We should use binary collation to compare datum, otherwise the result will be incorrect.
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newData[i].SetCollation(charset.CollationBin)
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cmp, err := newData[i].CompareDatum(sc, &oldData[i])
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newData[i].SetCollation(collation)
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if err != nil {
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return false, false, 0, err
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}
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if cmp != 0 {
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changed = true
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modified[i] = true
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// Rebase auto increment id if the field is changed.
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if mysql.HasAutoIncrementFlag(col.Flag) {
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recordID, err := getAutoRecordID(newData[i], &col.FieldType, false)
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if err != nil {
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return false, false, 0, err
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}
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if err = t.RebaseAutoID(sctx, recordID, true, autoid.RowIDAllocType); err != nil {
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return false, false, 0, err
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}
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}
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if col.IsPKHandleColumn(t.Meta()) {
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handleChanged = true
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newHandle = newData[i].GetInt64()
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// Rebase auto random id if the field is changed.
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if err := rebaseAutoRandomValue(sctx, t, &newData[i], col); err != nil {
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return false, false, 0, err
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}
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}
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} else {
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if mysql.HasOnUpdateNowFlag(col.Flag) && modified[i] {
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// It's for "UPDATE t SET ts = ts" and ts is a timestamp.
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onUpdateSpecified[i] = true
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}
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modified[i] = false
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}
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}
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sc.AddTouchedRows(1)
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// If no changes, nothing to do, return directly.
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if !changed {
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// See https://dev.mysql.com/doc/refman/5.7/en/mysql-real-connect.html CLIENT_FOUND_ROWS
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if sctx.GetSessionVars().ClientCapability&mysql.ClientFoundRows > 0 {
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sc.AddAffectedRows(1)
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}
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physicalID := t.Meta().ID
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if pt, ok := t.(table.PartitionedTable); ok {
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p, err := pt.GetPartitionByRow(sctx, oldData)
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if err != nil {
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return false, false, 0, err
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}
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physicalID = p.GetPhysicalID()
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}
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unchangedRowKey := tablecodec.EncodeRowKeyWithHandle(physicalID, h)
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txnCtx := sctx.GetSessionVars().TxnCtx
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if txnCtx.IsPessimistic {
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txnCtx.AddUnchangedRowKey(unchangedRowKey)
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}
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return false, false, 0, nil
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}
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// 4. Fill values into on-update-now fields, only if they are really changed.
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for i, col := range t.Cols() {
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if mysql.HasOnUpdateNowFlag(col.Flag) && !modified[i] && !onUpdateSpecified[i] {
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if v, err := expression.GetTimeValue(sctx, strings.ToUpper(ast.CurrentTimestamp), col.Tp, int8(col.Decimal)); err == nil {
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newData[i] = v
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modified[i] = true
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} else {
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return false, false, 0, err
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}
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}
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}
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// 5. If handle changed, remove the old then add the new record, otherwise update the record.
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if handleChanged {
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if sc.DupKeyAsWarning {
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// For `UPDATE IGNORE`/`INSERT IGNORE ON DUPLICATE KEY UPDATE`
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// If the new handle exists, this will avoid to remove the record.
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err = tables.CheckHandleExists(ctx, sctx, t, newHandle, newData)
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if err != nil {
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return false, handleChanged, newHandle, err
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}
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}
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if err = t.RemoveRecord(sctx, h, oldData); err != nil {
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return false, false, 0, err
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}
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// the `affectedRows` is increased when adding new record.
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if sc.DupKeyAsWarning {
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newHandle, err = t.AddRecord(sctx, newData, table.IsUpdate, table.SkipHandleCheck, table.WithCtx(ctx))
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} else {
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newHandle, err = t.AddRecord(sctx, newData, table.IsUpdate, table.WithCtx(ctx))
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}
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if err != nil {
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return false, false, 0, err
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}
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if onDup {
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sc.AddAffectedRows(1)
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}
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} else {
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// Update record to new value and update index.
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if err = t.UpdateRecord(ctx, sctx, h, oldData, newData, modified); err != nil {
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return false, false, 0, err
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}
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if onDup {
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sc.AddAffectedRows(2)
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} else {
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sc.AddAffectedRows(1)
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}
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}
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sc.AddUpdatedRows(1)
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sc.AddCopiedRows(1)
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return true, handleChanged, newHandle, nil
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}
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func rebaseAutoRandomValue(sctx sessionctx.Context, t table.Table, newData *types.Datum, col *table.Column) error {
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tableInfo := t.Meta()
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if !tableInfo.ContainsAutoRandomBits() {
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return nil
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}
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recordID, err := getAutoRecordID(*newData, &col.FieldType, false)
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if err != nil {
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return err
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}
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if recordID < 0 {
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return nil
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}
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layout := autoid.NewAutoRandomIDLayout(&col.FieldType, tableInfo.AutoRandomBits)
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// Set bits except incremental_bits to zero.
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recordID = recordID & (1<<layout.IncrementalBits - 1)
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return t.Allocators(sctx).Get(autoid.AutoRandomType).Rebase(tableInfo.ID, recordID, true)
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}
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// resetErrDataTooLong reset ErrDataTooLong error msg.
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// types.ErrDataTooLong is produced in types.ProduceStrWithSpecifiedTp, there is no column info in there,
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// so we reset the error msg here, and wrap old err with errors.Wrap.
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func resetErrDataTooLong(colName string, rowIdx int, err error) error {
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newErr := types.ErrDataTooLong.GenWithStack("Data too long for column '%v' at row %v", colName, rowIdx)
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logutil.BgLogger().Error("data too long for column", zap.String("colName", colName), zap.Int("rowIndex", rowIdx))
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return newErr
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}
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