my7ym commented on a change in pull request #1811: [CALCITE-3789] Support 
validation of UNNEST multiple array columns like Presto
URL: https://github.com/apache/calcite/pull/1811#discussion_r380292169
 
 

 ##########
 File path: 
core/src/main/java/org/apache/calcite/sql/validate/DelegatingScope.java
 ##########
 @@ -298,7 +298,11 @@ public SqlQualified fullyQualify(SqlIdentifier 
identifier) {
       for (; i > 0; i--) {
         final SqlIdentifier prefix = identifier.getComponent(0, i);
         resolved.clear();
-        resolve(prefix.names, nameMatcher, false, resolved);
+        resolve(
+            prefix.names,
+            nameMatcher,
+            validator.getConformance().allowAliasUnnestArrayColumns(),
+            resolved);
 
 Review comment:
   Sorry a little confused here. Here I am directly using conformance as the 
flag. I feel like it's more concise than an explicit flag like 
   
   SqlValidatorImpl.java::
   boolean allowAliasUnnestArrays = 
validator.getConformance().allowAliasUnnestArrayColumns;
   DelegatingScope.setAllowAliasUnnestArrays(allowAliasUnnestArrays);
   
   DeletatingScope.java::
   Just replace validator.getConformance().allowAliasUnnestArrayColumns with 
the explicit flag.
   
   And it seems using conformance in scope happens before. e.g. OrderByScope.

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