From 7ad72bbcb8f9e9533cfe7c6d84e7f4f5d9fc98bc Mon Sep 17 00:00:00 2001
From: EmmyMiao87 <522274284@qq.com>
Date: Tue, 5 Nov 2019 20:31:23 +0800
Subject: [PATCH] Enable decimalV2 cast to different precision (#2131)

The precision of cast function is useless. For example,
Query: select cast(10 as decimal(1,0));
Result: 10
Although numeric field is overflow, the numeric could be return.

So, the cast function from decimal(a,b) to decimal(c,d) could not be executed.
---
 fe/src/main/java/org/apache/doris/analysis/CastExpr.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fe/src/main/java/org/apache/doris/analysis/CastExpr.java b/fe/src/main/java/org/apache/doris/analysis/CastExpr.java
index ba1c81977e..2f78e15a9b 100644
--- a/fe/src/main/java/org/apache/doris/analysis/CastExpr.java
+++ b/fe/src/main/java/org/apache/doris/analysis/CastExpr.java
@@ -176,7 +176,7 @@ public class CastExpr extends Expr {
         Type childType = getChild(0).getType();
 
         // this cast may result in loss of precision, but the user requested it
-        if (childType.equals(type)) {
+        if (childType.matchesType(type)) {
             noOp = true;
             return;
         }