[doris] 01/05: [opt](planner) return bigint literal when cast date literal to bigint type (#15613)

[morningman]

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morningman pushed a commit to branch branch-1.2-lts
in repository https://gitbox.apache.org/repos/asf/doris.git

commit f59626a32ebd9f60207a2daa358e7948a93e2a01
Author: minghong <engle...@gmail.com>
AuthorDate: Fri Jan 13 12:58:04 2023 +0800

    [opt](planner) return bigint literal when cast date literal to bigint type 
(#15613)
---
 .../src/main/java/org/apache/doris/analysis/DateLiteral.java     | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git 
a/fe/fe-core/src/main/java/org/apache/doris/analysis/DateLiteral.java 
b/fe/fe-core/src/main/java/org/apache/doris/analysis/DateLiteral.java
index 2377351822..229769e6f2 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/analysis/DateLiteral.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/analysis/DateLiteral.java
@@ -647,8 +647,13 @@ public class DateLiteral extends LiteralExpr {
             }
         } else if (targetType.isStringType()) {
             return new StringLiteral(getStringValue());
-        } else if (Type.isImplicitlyCastable(this.type, targetType, true)) {
-            return new CastExpr(targetType, this);
+        } else if (targetType.isBigIntType()) {
+            long value = getYear() * 1000 + getMonth() * 100 + getDay();
+            return new IntLiteral(value, Type.BIGINT);
+        } else {
+            if (Type.isImplicitlyCastable(this.type, targetType, true)) {
+                return new CastExpr(targetType, this);
+            }
         }
         Preconditions.checkState(false);
         return this;


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