eldenmoon commented on code in PR #32225:
URL: https://github.com/apache/doris/pull/32225#discussion_r1524733506
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/ExpressionAnalyzer.java:
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@@ -331,6 +340,17 @@ public Expression visitUnboundFunction(UnboundFunction
unboundFunction, Expressi
// so wrap COUNT with Nvl to ensure it's result is 0 instead
of null to get the correct result
boundFunction = new Nvl(boundFunction, new BigIntLiteral(0));
}
+
+ if (currentElementAtLevel == 1
+ &&
PushDownToProjectionFunction.validToPushDown(boundFunction)) {
+ // Only rewrite the top level of PushDownToProjectionFunction,
otherwise invalid slot will be generated
+ // currentElementAtLevel == 1 means at the top of element_at
function, other levels will be ignored.
+ currentElementAtLevel = 0;
+ return visitElementAt((ElementAt) boundFunction, context);
+ }
+ if (unboundFunction.getName().equalsIgnoreCase("element_at")) {
Review Comment:
increase and decrease condition should be symmetrical？
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