Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/11208#discussion_r56779046 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -369,28 +370,83 @@ class Analyzer( } /** - * Replaces [[UnresolvedAttribute]]s with concrete [[AttributeReference]]s from - * a logical plan node's children. + * Expand [[UnresolvedStar]] or [[ResolvedStar]] to the matching attributes in child's output. */ - object ResolveReferences extends Rule[LogicalPlan] { + object ResolveStar extends Rule[LogicalPlan] { + + def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators { + case p: LogicalPlan if !p.childrenResolved => p + + // If the projection list contains Stars, expand it. + case p: Project if containsStar(p.projectList) => + val expanded = p.projectList.flatMap { + case s: Star => s.expand(p.child, resolver) + case ua @ UnresolvedAlias(_: UnresolvedFunction | _: CreateArray | _: CreateStruct, _) => + UnresolvedAlias(child = expandStarExpression(ua.child, p.child)) :: Nil + case a @ Alias(_: UnresolvedFunction | _: CreateArray | _: CreateStruct, _) => + Alias(child = expandStarExpression(a.child, p.child), a.name)( + isGenerated = a.isGenerated) :: Nil + case o => o :: Nil + } + Project(projectList = expanded, p.child) + // If the aggregate function argument contains Stars, expand it. + case a: Aggregate if containsStar(a.aggregateExpressions) => + val expanded = a.aggregateExpressions.flatMap { + case s: Star => s.expand(a.child, resolver) + case o if containsStar(o :: Nil) => expandStarExpression(o, a.child) :: Nil + case o => o :: Nil + }.map(_.asInstanceOf[NamedExpression]) + a.copy(aggregateExpressions = expanded) + // If the script transformation input contains Stars, expand it. + case t: ScriptTransformation if containsStar(t.input) => + t.copy( + input = t.input.flatMap { + case s: Star => s.expand(t.child, resolver) + case o => o :: Nil + } + ) + case g: Generate if containsStar(g.generator.children) => + failAnalysis("Invalid usage of '*' in explode/json_tuple/UDTF") + } + + /** + * Returns true if `exprs` contains a [[Star]]. + */ + def containsStar(exprs: Seq[Expression]): Boolean = + exprs.exists(_.collect { case _: Star => true }.nonEmpty) + /** - * Foreach expression, expands the matching attribute.*'s in `child`'s input for the subtree - * rooted at each expression. + * Expands the matching attribute.*'s in `child`'s output. */ - def expandStarExpressions(exprs: Seq[Expression], child: LogicalPlan): Seq[Expression] = { - exprs.flatMap { - case s: Star => s.expand(child, resolver) - case e => - e.transformDown { - case f1: UnresolvedFunction if containsStar(f1.children) => - f1.copy(children = f1.children.flatMap { - case s: Star => s.expand(child, resolver) - case o => o :: Nil - }) - } :: Nil + def expandStarExpression(expr: Expression, child: LogicalPlan): Expression = { + expr.transformUp { + case f1: UnresolvedFunction if containsStar(f1.children) => + f1.copy(children = f1.children.flatMap { + case s: Star => s.expand(child, resolver) + case o => o :: Nil + }) + case c: CreateStruct if containsStar(c.children) => + c.copy(children = c.children.flatMap { + case s: Star => s.expand(child, resolver) + case o => o :: Nil + }) + case c: CreateArray if containsStar(c.children) => + c.copy(children = c.children.flatMap { + case s: Star => s.expand(child, resolver) + case o => o :: Nil + }) + // count(*) has been replaced by count(1) + case o if containsStar(o.children) => --- End diff -- We can have a method: ``` private def mayContainsStar(expr: Expression): Boolean = expr.isInstnaceOf[UnresolvedFunction] || expr.isInstnaceOf[CreateStruct]... ``` then we can simplify this to: ``` expr.transformUp { case e if mayContainsStar(e) => e.copy(children = ...) } ```
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