yingyuwang commented on code in PR #2838:
URL: https://github.com/apache/calcite/pull/2838#discussion_r906274526


##########
core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java:
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@@ -6661,6 +6661,11 @@ static class ExtendedExpander extends Expander {
           SqlIdentifier sid = (SqlIdentifier) expr;
           final SqlIdentifier fqId = getScope().fullyQualify(sid).identifier;
           expr = expandDynamicStar(sid, fqId);
+        } else {
+          requireNonNull(expr, "expr");
+          SqlNode exprCopy = expr.clone(expr.getParserPosition());

Review Comment:
   Hi @hannerwang, many thanks for taking CALCITE-5145 my pr-2818 into 
consideration. Your change LGTM and it looks much cleaner than I experimented 
in pr-2818!



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