cloud-fan commented on a change in pull request #31758:
URL: https://github.com/apache/spark/pull/31758#discussion_r588151665
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
##########
@@ -1964,28 +1963,22 @@ class Analyzer(override val catalogManager:
CatalogManager)
*
* @param e The expression need to be resolved.
* @param q The LogicalPlan whose children are used to resolve expression's
attribute.
- * @param trimAlias When true, trim unnecessary alias of GetStructField`.
Note that,
- * we cannot trim the alias of top-level `GetStructField`,
as we should
- * resolve `UnresolvedAttribute` to a named expression. The
caller side
- * can trim the alias of top-level `GetStructField` if it's
safe to do so.
* @return resolved Expression.
*/
def resolveExpressionByPlanChildren(
e: Expression,
- q: LogicalPlan,
- trimAlias: Boolean = false): Expression = {
+ q: LogicalPlan): Expression = {
resolveExpression(
e,
q,
resolveColumnByName = nameParts => {
q.resolveChildren(nameParts, resolver)
},
resolveColumnByOrdinal = ordinal => {
- val candidates = q.children.flatMap(_.output)
- assert(ordinal >= 0 && ordinal < candidates.length)
- candidates.apply(ordinal)
+ assert(q.children.length == 1)
Review comment:
This change is not related to this PR, but a small followup from
https://github.com/apache/spark/pull/31728#discussion_r588049629
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