Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/14083#discussion_r69849376 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala --- @@ -165,111 +169,99 @@ abstract class LogicalPlan extends QueryPlan[LogicalPlan] with Logging { def resolveQuoted( name: String, resolver: Resolver): Option[NamedExpression] = { - resolve(UnresolvedAttribute.parseAttributeName(name), output, resolver) + outputAttributeResolver.resolve(UnresolvedAttribute.parseAttributeName(name), resolver) } /** - * Resolve the given `name` string against the given attribute, returning either 0 or 1 match. - * - * This assumes `name` has multiple parts, where the 1st part is a qualifier - * (i.e. table name, alias, or subquery alias). - * See the comment above `candidates` variable in resolve() for semantics the returned data. + * Refreshes (or invalidates) any metadata/data cached in the plan recursively. */ - private def resolveAsTableColumn( - nameParts: Seq[String], - resolver: Resolver, - attribute: Attribute): Option[(Attribute, List[String])] = { - assert(nameParts.length > 1) - if (attribute.qualifier.exists(resolver(_, nameParts.head))) { - // At least one qualifier matches. See if remaining parts match. - val remainingParts = nameParts.tail - resolveAsColumn(remainingParts, resolver, attribute) - } else { - None - } + def refresh(): Unit = children.foreach(_.refresh()) +} + +/** + * Helper class for (LogicalPlan) attribute resolution. This class indexes attributes by their + * case-in-sensitive name, and checks potential candidates using the given Resolver. Both qualified + * and direct resolution are supported. + */ +private[catalyst] class AttributeResolver(attributes: Seq[Attribute]) extends Logging { + private def unique[T](m: Map[T, Seq[Attribute]]): Map[T, Seq[Attribute]] = { + m.mapValues(_.distinct).map(identity) } - /** - * Resolve the given `name` string against the given attribute, returning either 0 or 1 match. - * - * Different from resolveAsTableColumn, this assumes `name` does NOT start with a qualifier. - * See the comment above `candidates` variable in resolve() for semantics the returned data. - */ - private def resolveAsColumn( - nameParts: Seq[String], - resolver: Resolver, - attribute: Attribute): Option[(Attribute, List[String])] = { - if (!attribute.isGenerated && resolver(attribute.name, nameParts.head)) { - Option((attribute.withName(nameParts.head), nameParts.tail.toList)) - } else { - None + /** Map to use for direct case insensitive attribute lookups. */ + private val direct: Map[String, Seq[Attribute]] = { --- End diff -- You have a point: it is the secondary code path, so it is less likely to be used. I'll take a look at it on my next pass.
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