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【极速学习spark源码】Analyzer 规则体系详解

【极速学习spark源码】Analyzer 规则体系详解

基于 Spark 4.2,分支 branch-4.2

阅读时长约 10分钟 · 进阶

背景

Parser 只负责把 SQL 字符串变成一棵 Unresolved LogicalPlan

'Project ['id]+- 'Filter ('id > 10)   +- 'UnresolvedRelation [t]

这棵树里有很多“不知道”:

  • t 是表?视图?临时视图?物理表?

  • id 是哪张表的列?类型是什么?

  • > 两边类型是否能比较?

  • count 是内置函数还是 UDF?

Analyzer 的工作就是把这些“不知道”变成确定的对象。


一、Analyzer 在执行链路中的位置

QueryExecution.scala:192

private val lazyAnalyzed = LazyTry {  val plan = executePhase(QueryPlanningTracker.ANALYSIS) {    analyzer.executeAndCheck(sqlScriptExecuted, tracker)  }  tracker.setAnalyzed(plan)  plan}

真正入口是 Analyzer.executeAndCheck,在 Analyzer.scala:331

def executeAndCheck(plan: LogicalPlan, tracker: QueryPlanningTracker): LogicalPlan = {  if (plan.analyzed) {    plan  } else {    def runAnalysis(): LogicalPlan =      HybridAnalyzer.fromLegacyAnalyzer(legacyAnalyzer = this, tracker = tracker).apply(plan)    // ...  }}

注意:Spark 4.2 已经引入了 HybridAnalyzer。老文章里常见的“Analyzer 直接执行 RuleExecutor”这句话不完整了。


二、HybridAnalyzer:4.x 的分析入口

HybridAnalyzer.scala:54

classHybridAnalyzer(...) {

入口在 HybridAnalyzer.scala:66

def apply(plan: LogicalPlan): LogicalPlan = {  if (singlePassResolverExtensions.isDefined) {    resolveInSinglePass(plan)  } else if (dualRunLegacyAndSinglePassResolver) {    resolveInDualRun(plan)  } else {    resolveInFixedPoint(plan)  }}

默认路径仍然是 fixed-point analyzer。HybridAnalyzer.scala:272-275

private def resolveInFixedPoint(plan: LogicalPlan): LogicalPlan = {  val resolvedPlan = legacyAnalyzer.executeAndTrack(plan, tracker)  legacyAnalyzer.checkAnalysis(resolvedPlan)  resolvedPlan}

所以当前可以这样理解:

QueryExecution.lazyAnalyzed  → Analyzer.executeAndCheck    → HybridAnalyzer.apply      → resolveInFixedPoint        → legacyAnalyzer.executeAndTrack        → legacyAnalyzer.checkAnalysis

三、Analyzer 本质上是 RuleExecutor

Analyzer.scala:304

class Analyzer(...) extends RuleExecutor[LogicalPlanwith CheckAnalysis with ...

它继承了 RuleExecutor[LogicalPlan],所以 Analyzer 的工作方式就是:

  1. 定义一批 batches

  2. 每个 batch 里面放一组 rules

  3. 每个 rule 改写 LogicalPlan

  4. batch 按策略执行一次或多次,直到 fixed point

Analyzer.scala:506

override def batches: Seq[Batch] =  earlyBatches ++ Seq(    Batch("Resolution", fixedPoint, ...),    Batch("Remove TempResolvedColumn", Once, ...),    Batch("Post-Hoc Resolution", Once, ...),    Batch("Cleanup", fixedPoint, ...)  )

最核心的是 Resolution batch,入口在 Analyzer.scala:507


四、RuleExecutor:规则如何跑起来

RuleExecutor.scala:125

abstract classRuleExecutor[TreeType <: TreeNode[_]] extendsLogging{

策略定义:

case object Once extends Strategy         // RuleExecutor.scala:150case class FixedPoint(...) extends Strategy // RuleExecutor.scala:156

Batch 定义:

case class Batch(name: String, strategy: Strategy, rules: Rule[TreeType]*) // RuleExecutor.scala:162

执行主循环在 RuleExecutor.scala:215

def execute(planTreeType): TreeType = {  var curPlan = plan  batches.foreach { batch =>    var iteration = 1    var continue = true    while (continue) {      val lastPlan = curPlan      curPlan = batch.rules.foldLeft(curPlan) { case (plan, rule) =>        rule(plan)      }      if (iteration >= batch.strategy.maxIterations || curPlan.fastEquals(lastPlan)) {        continue = false      }      iteration += 1    }  }  curPlan}

这段就是 fixed-point 的核心:

一轮规则跑完,如果计划没有变化,就停;否则继续跑下一轮。


五、Resolution batch 里有哪些规则

Analyzer.scala:507 开始的 Resolution batch 很长。几个最重要的规则:

规则加入 batch 的位置定义入口作用
ResolveRelationsAnalyzer.scala:510Analyzer.scala:1042把表名解析成具体 relation
ResolveReferencesAnalyzer.scala:519Analyzer.scala:1495把列名解析成 AttributeReference
ResolveFunctionsAnalyzer.scala:533Analyzer.scala:2282把函数名解析成具体 Expression
ResolveAliasesAnalyzer.scala:540Analyzer.scala:670给未命名表达式补 alias
ResolveSubqueryAnalyzer.scala:541Analyzer.scala:2501解析子查询

这些规则的目标都是消灭 Unresolved*


六、ResolveRelations:表名变 relation

Parser 产物里表名是:

'UnresolvedRelation [t]

ResolveRelations 定义在 Analyzer.scala:1042。它会查:

  • 临时视图

  • 全局临时视图

  • session catalog

  • v2 catalog

最后把 UnresolvedRelation 替换成具体的逻辑节点,比如:

  • SubqueryAlias

  • LogicalRelation

  • DataSourceV2Relation

  • View

这就是为什么“表不存在”是在 Analyzer 阶段报错,而不是 Parser 阶段。


七、ResolveReferences:列名变 AttributeReference

ResolveReferences 定义在 Analyzer.scala:1495,入口在 Analyzer.scala:1532

它的工作是把:

'id

变成:

id#0L

这个 #0L 不是随便加的。它代表一个带 ExprId 和类型信息的 AttributeReference

为什么需要 ExprId?因为 SQL 里可能有同名列:

SELECT id FROM t1 JOIN t2 ON t1.id = t2.id

光看名字 id 不够,Analyzer 必须知道你指的是哪一个输出属性。


八、ResolveFunctions:函数名变 Expression

ResolveFunctions 定义在 Analyzer.scala:2282,入口在 Analyzer.scala:2283

它把:

SELECT count(*), upper(name) FROM t

里的 countupper 解析成具体的 Catalyst expression:

  • 聚合函数

  • 普通标量函数

  • 临时函数

  • catalog function

如果函数不存在,也是在 Analyzer 阶段报错。


九、checkAnalysis:不是解析完就完事

Analyzer 不只是“解析名字”。解析完还要检查计划是否合法。

CheckAnalysis.scala:306

def checkAnalysis(plan: LogicalPlan): Unit = {  val inlineCTE = InlineCTE(alwaysInline = true, keepDanglingRelations = true)  val inlinedPlan = inlineCTE(plan)  checkAnalysis0(inlinedPlan)  plan.setAnalyzed()}

它会检查很多错误:

  • 还有未解析的表 / 列 / 函数

  • 聚合表达式是否合法

  • 数据类型是否匹配

  • 子查询是否合法

  • 生成列 / 窗口函数 / streaming 限制等

CheckAnalysis.scala:327 的 plan.setAnalyzed() 很关键:只有通过检查的 plan 才会被标记为 analyzed。

此外,QueryExecution.assertSupported 在 QueryExecution.scala:161,会调用 UnsupportedOperationChecker.checkForBatch(analyzed)QueryExecution.scala:163),检查一些批查询不支持的操作。


十、实战:观察 Analyzer 前后差异

spark.range(10).toDF("id").createOrReplaceTempView("t")val sql = "SELECT id, id + 1 AS next_id FROM t WHERE id > 3"val parsed = spark.sessionState.sqlParser.parsePlan(sql)val df = spark.sql(sql)println("=== Parsed ===")println(parsed)println("=== Analyzed ===")println(df.queryExecution.analyzed)

输出:

=== Parsed ==='Project ['id, ('id + 1) AS next_id#...]+- 'Filter ('id > 3)   +- 'UnresolvedRelation [t], [], false=== Analyzed ===Project [id#0L, (id#0+ cast(1 as bigint)) AS next_id#...]+- Filter (id#0> cast(3 as bigint))   +- SubqueryAlias t      +- View ... / Range ...

重点看三件事:

  1. UnresolvedRelation 消失

  2. 'id 变成 id#0L

  3. 1 和 3 被补上类型转换


十一、总结

Analyzer 可以压缩成这条链:

Unresolved LogicalPlan  → HybridAnalyzer.apply    → legacyAnalyzer.executeAndTrack      → RuleExecutor batches        → Resolution batch          → ResolveRelations          → ResolveReferences          → ResolveFunctions          → ResolveAliases          → ResolveSubquery    → checkAnalysis  → Analyzed LogicalPlan

最值得带走的三个认知:

  1. Analyzer 的核心目标是消灭 Unresolved。 表名、列名、函数名、子查询都在这里变成具体对象。

  2. Analyzer 是 RuleExecutor。 规则按 batch 执行,FixedPoint batch 会反复迭代直到计划不再变化。

  3. Spark 4.2 的入口是 HybridAnalyzer。 默认仍走 legacy fixed-point analyzer。


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  1. CONNECT:[ UseTime:0.000613s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000769s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000319s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000973s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000510s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000566s ]
  8. SELECT * FROM `article` WHERE `id` = 869171 LIMIT 1 [ RunTime:0.000457s ]
  9. UPDATE `article` SET `lasttime` = 1784625408 WHERE `id` = 869171 [ RunTime:0.015004s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000434s ]
  11. SELECT * FROM `article` WHERE `id` < 869171 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000625s ]
  12. SELECT * FROM `article` WHERE `id` > 869171 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000464s ]
  13. SELECT * FROM `article` WHERE `id` < 869171 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000795s ]
  14. SELECT * FROM `article` WHERE `id` < 869171 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015802s ]
  15. SELECT * FROM `article` WHERE `id` < 869171 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001446s ]
0.120654s