anchovYu commented on code in PR #42276:
URL: https://github.com/apache/spark/pull/42276#discussion_r1285473731
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveLateralColumnAliasReference.scala:
##########
@@ -131,138 +131,166 @@ object ResolveLateralColumnAliasReference extends
Rule[LogicalPlan] {
(pList.exists(hasWindowExpression) && p.expressions.forall(_.resolved)
&& p.childrenResolved)
}
- override def apply(plan: LogicalPlan): LogicalPlan = {
- if (!conf.getConf(SQLConf.LATERAL_COLUMN_ALIAS_IMPLICIT_ENABLED)) {
- plan
- } else if (plan.containsAnyPattern(TEMP_RESOLVED_COLUMN,
UNRESOLVED_HAVING)) {
- // It should not change the plan if `TempResolvedColumn` or
`UnresolvedHaving` is present in
- // the query plan. These plans need certain plan shape to get recognized
and resolved by other
- // rules, such as Filter/Sort + Aggregate to be matched by
ResolveAggregateFunctions.
- // LCA resolution can break the plan shape, like adding Project above
Aggregate.
- plan
- } else {
- // phase 2: unwrap
- plan.resolveOperatorsUpWithPruning(
- _.containsPattern(LATERAL_COLUMN_ALIAS_REFERENCE), ruleId) {
- case p @ Project(projectList, child) if ruleApplicableOnOperator(p,
projectList)
- &&
projectList.exists(_.containsPattern(LATERAL_COLUMN_ALIAS_REFERENCE)) =>
- var aliasMap = AttributeMap.empty[AliasEntry]
- val referencedAliases = collection.mutable.Set.empty[AliasEntry]
- def unwrapLCAReference(e: NamedExpression): NamedExpression = {
-
e.transformWithPruning(_.containsPattern(LATERAL_COLUMN_ALIAS_REFERENCE)) {
- case lcaRef: LateralColumnAliasReference if
aliasMap.contains(lcaRef.a) =>
- val aliasEntry = aliasMap.get(lcaRef.a).get
- // If there is no chaining of lateral column alias reference,
push down the alias
- // and unwrap the LateralColumnAliasReference to the
NamedExpression inside
- // If there is chaining, don't resolve and save to future
rounds
- if
(!aliasEntry.alias.containsPattern(LATERAL_COLUMN_ALIAS_REFERENCE)) {
- referencedAliases += aliasEntry
- lcaRef.ne
- } else {
- lcaRef
- }
- case lcaRef: LateralColumnAliasReference if
!aliasMap.contains(lcaRef.a) =>
- // It shouldn't happen, but restore to unresolved attribute to
be safe.
- UnresolvedAttribute(lcaRef.nameParts)
- }.asInstanceOf[NamedExpression]
- }
- val newProjectList = projectList.zipWithIndex.map {
- case (a: Alias, idx) =>
- val lcaResolved = unwrapLCAReference(a)
- // Insert the original alias instead of rewritten one to detect
chained LCA
- aliasMap += (a.toAttribute -> AliasEntry(a, idx))
- lcaResolved
- case (e, _) =>
- unwrapLCAReference(e)
- }
+ /** Internal application method. A hand-written top down recursive traverse.
*/
+ private def apply0(plan: LogicalPlan): LogicalPlan = {
+ plan match {
+ case p: LogicalPlan if
!p.containsPattern(LATERAL_COLUMN_ALIAS_REFERENCE) =>
+ p
- if (referencedAliases.isEmpty) {
- p
- } else {
- val outerProjectList = collection.mutable.Seq(newProjectList: _*)
- val innerProjectList =
-
collection.mutable.ArrayBuffer(child.output.map(_.asInstanceOf[NamedExpression]):
_*)
- referencedAliases.foreach { case AliasEntry(alias: Alias, idx) =>
- outerProjectList.update(idx, alias.toAttribute)
- innerProjectList += alias
- }
- p.copy(
- projectList = outerProjectList.toSeq,
- child = Project(innerProjectList.toSeq, child)
- )
- }
+ // It should not change the Aggregate (and thus the plan shape) if its
parent is an
+ // UnresolvedHaving, to avoid breaking the shape pattern
`UnresolvedHaving - Aggregate`
+ // matched by ResolveAggregateFunctions. See SPARK-42936 for more
details.
+ case u @ UnresolvedHaving(_, agg: Aggregate)
+ if
agg.aggregateExpressions.exists(_.containsPattern(LATERAL_COLUMN_ALIAS_REFERENCE))
=>
+ u.copy(child = agg.mapChildren(apply0))
- case agg @ Aggregate(groupingExpressions, aggregateExpressions, _)
- if ruleApplicableOnOperator(agg, aggregateExpressions)
- &&
aggregateExpressions.exists(_.containsPattern(LATERAL_COLUMN_ALIAS_REFERENCE))
=>
+ case p @ Project(projectList, child) if ruleApplicableOnOperator(p,
projectList)
Review Comment:
Completely copied the original code except adding the final line to
recursively iterating children
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