From c68e6a9ca856ad441bbf311fa73814e583162182 Mon Sep 17 00:00:00 2001
From: ChinaYiGuan <91529181+ChinaYiGuan@users.noreply.github.com>
Date: Fri, 8 Sep 2023 10:49:35 +0800
Subject: [PATCH] [Fix](catalog) Doris datetime type conversion failed (#23906)

1. The catalog is connected to an old version of Doris, and an error is reported when using the datetime field type on the Doris surface .
2. error message [fe]:
  Caused by: java.lang.NumberFormatException: For input string: "DATETIM"
  at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[?:1.8.0_291]
  at java.lang.Integer.parseInt(Integer.java:580) ~[?:1.8.0_291]
  at java.lang.Integer.parseInt(Integer.java:615) ~[?:1.8.0_291]
  at org.apache.doris.datasource.jdbc.client.JdbcMySQLClient.dorisTypeToDoris(JdbcMySQLClient.java:401) ~[doris-fe.jar:1.2-
 SNAPSHOT]
---
 .../apache/doris/datasource/jdbc/client/JdbcMySQLClient.java   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcMySQLClient.java b/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcMySQLClient.java
index 7004309d2d..a58ac1a350 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcMySQLClient.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcMySQLClient.java
@@ -400,7 +400,8 @@ public class JdbcMySQLClient extends JdbcClient {
                 return ScalarType.createDateV2Type();
             case "DATETIME":
             case "DATETIMEV2": {
-                int scale = Integer.parseInt(upperType.substring(openParen + 1, upperType.length() - 1));
+                int scale = (openParen == -1) ? 6
+                        : Integer.parseInt(upperType.substring(openParen + 1, upperType.length() - 1));
                 if (scale > 6) {
                     scale = 6;
                 }