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90 lines
2.5 KiB
90 lines
2.5 KiB
// 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 executor
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import (
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"context"
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"encoding/json"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/domain"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/statistics/handle"
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"github.com/pingcap/tidb/util/chunk"
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)
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var _ Executor = &LoadStatsExec{}
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// LoadStatsExec represents a load statistic executor.
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type LoadStatsExec struct {
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baseExecutor
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info *LoadStatsInfo
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}
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// LoadStatsInfo saves the information of loading statistic operation.
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type LoadStatsInfo struct {
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Path string
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Ctx sessionctx.Context
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}
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// loadStatsVarKeyType is a dummy type to avoid naming collision in context.
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type loadStatsVarKeyType int
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// String defines a Stringer function for debugging and pretty printing.
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func (k loadStatsVarKeyType) String() string {
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return "load_stats_var"
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}
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// LoadStatsVarKey is a variable key for load statistic.
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const LoadStatsVarKey loadStatsVarKeyType = 0
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// Next implements the Executor Next interface.
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func (e *LoadStatsExec) Next(ctx context.Context, req *chunk.Chunk) error {
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req.GrowAndReset(e.maxChunkSize)
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if len(e.info.Path) == 0 {
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return errors.New("Load Stats: file path is empty")
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}
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val := e.ctx.Value(LoadStatsVarKey)
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if val != nil {
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e.ctx.SetValue(LoadStatsVarKey, nil)
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return errors.New("Load Stats: previous load stats option isn't closed normally")
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}
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e.ctx.SetValue(LoadStatsVarKey, e.info)
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return nil
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}
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// Close implements the Executor Close interface.
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func (e *LoadStatsExec) Close() error {
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return nil
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}
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// Open implements the Executor Open interface.
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func (e *LoadStatsExec) Open(ctx context.Context) error {
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return nil
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}
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// Update updates the stats of the corresponding table according to the data.
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func (e *LoadStatsInfo) Update(data []byte) error {
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jsonTbl := &handle.JSONTable{}
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if err := json.Unmarshal(data, jsonTbl); err != nil {
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return errors.Trace(err)
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}
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do := domain.GetDomain(e.Ctx)
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h := do.StatsHandle()
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if h == nil {
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return errors.New("Load Stats: handle is nil")
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}
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return h.LoadStatsFromJSON(infoschema.GetInfoSchema(e.Ctx), jsonTbl)
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}
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