From ce236bfcd4a93cdd75fb0cd131356f01886f7c2c Mon Sep 17 00:00:00 2001
From: xionglei0 <55084968+xionglei0@users.noreply.github.com>
Date: Sat, 12 Oct 2019 19:11:17 +0800
Subject: [PATCH] add alter table modify limit: Cannot change DATETIME to DATE
 (#1963)

---
 fe/src/main/java/org/apache/doris/catalog/Column.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fe/src/main/java/org/apache/doris/catalog/Column.java b/fe/src/main/java/org/apache/doris/catalog/Column.java
index 6e076c3734..7ff5466441 100644
--- a/fe/src/main/java/org/apache/doris/catalog/Column.java
+++ b/fe/src/main/java/org/apache/doris/catalog/Column.java
@@ -260,6 +260,10 @@ public class Column implements Writable {
             }
         }
 
+        if (getDataType() == PrimitiveType.DATETIME && other.getDataType() == PrimitiveType.DATE) {
+            throw new DdlException("Cannot change from DATETIME to DATE");
+        }
+
         if (this.getPrecision() != other.getPrecision()) {
             throw new DdlException("Cannot change precision");
         }