AngersZhuuuu commented on a change in pull request #28490:
URL: https://github.com/apache/spark/pull/28490#discussion_r480858783
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -1325,24 +1325,43 @@ class Analyzer(
*
* Note : In this routine, the unresolved attributes are resolved from the
input plan's
* children attributes.
+ *
+ * @param e the expression need to be resolved.
+ * @param q the LogicalPlan whose children are used to resolve
expression's attribute.
+ * @param trimAlias whether need to trim alias of Struct field. When true,
we will trim
+ * Struct field alias. When isTopLevel = true, we won't
trim top-level
+ * Struct field alias.
+ * @param isTopLevel whether need to trim top-level alias of Struct field.
this param is
Review comment:
> how about hiding this parameter from the caller side
>
> ```
> def resolveExpressionTopDown(e: Expression, q: LogicalPlan, trimAlias:
Boolean = false) = {
> if (e.resolved) return e
> def innerResolve(expr: Expression, isTopLevel: Boolean) = expr match {
> case ...
> ...
> }
> innerResolve(e, isTopLevel = true)
> }
> ```
Hide this method is more safe, but we need to contain `if (e.resolved)
return e` in `innerResolve`
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