From 9864a5d818396e7a026f8cd8201878749cb6a4e3 Mon Sep 17 00:00:00 2001
From: EmmyMiao87 <522274284@qq.com>
Date: Thu, 17 Dec 2020 00:33:27 +0800
Subject: [PATCH] [Enhance] Modify the error message when mv column is
 transformed from base column in agg family table (#5084)

When user wants to create materialized view with a mv column which is transformed
from original column in agg family table, Doris will throw a new error message
"The mv column of agg or uniq table cannot be transformed from original column"
instead of "column not exists".
---
 .../java/org/apache/doris/alter/MaterializedViewHandler.java  | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/alter/MaterializedViewHandler.java b/fe/fe-core/src/main/java/org/apache/doris/alter/MaterializedViewHandler.java
index 1e0c14f99e..917e8006b0 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/alter/MaterializedViewHandler.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/alter/MaterializedViewHandler.java
@@ -444,6 +444,10 @@ public class MaterializedViewHandler extends AlterHandler {
                 if (mvColumnItem.isKey()) {
                     ++numOfKeys;
                 }
+                if (baseColumn == null) {
+                    throw new DdlException("The mv column of agg or uniq table cannot be transformed "
+                            + "from original column[" + mvColumnItem.getBaseColumnName() + "]");
+                }
                 Preconditions.checkNotNull(baseColumn, "Column[" + mvColumnName + "] does not exist");
                 AggregateType baseAggregationType = baseColumn.getAggregationType();
                 AggregateType mvAggregationType = mvColumnItem.getAggregationType();