From db846709d22569ff703153a87f67f815f6eb6801 Mon Sep 17 00:00:00 2001
From: morrySnow <101034200+morrySnow@users.noreply.github.com>
Date: Tue, 16 Apr 2024 18:30:55 +0800
Subject: [PATCH] [opt](Nereids) auto fallback when meet udf override (#33708)

---
 .../java/org/apache/doris/catalog/FunctionRegistry.java  | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/catalog/FunctionRegistry.java b/fe/fe-core/src/main/java/org/apache/doris/catalog/FunctionRegistry.java
index 56016ad071..72a82b177b 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/catalog/FunctionRegistry.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/catalog/FunctionRegistry.java
@@ -154,7 +154,14 @@ public class FunctionRegistry {
         }
         if (candidateBuilders.size() > 1) {
             String candidateHints = getCandidateHint(name, candidateBuilders);
-            // NereidsPlanner not supported override function by the same arity, should we support it?
+            // TODO: NereidsPlanner not supported override function by the same arity, we will support it later
+            if (ConnectContext.get() != null) {
+                try {
+                    ConnectContext.get().getSessionVariable().enableFallbackToOriginalPlannerOnce();
+                } catch (Throwable t) {
+                    // ignore error
+                }
+            }
             throw new AnalysisException("Function '" + qualifiedName + "' is ambiguous: " + candidateHints);
         }