[fix](nereids) show columns type hide Column Version

fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcMySQLClient.java

@@ -422,7 +422,7 @@ private Type dorisTypeToDoris(JdbcFieldSchema fieldSchema) {
                 return ScalarType.createDateV2Type();
             case "DATETIME":
             case "DATETIMEV2": {
-                int scale = (openParen == -1) ? 6
+                int scale = (openParen == -1) ? 0
                         : Integer.parseInt(upperType.substring(openParen + 1, upperType.length() - 1));
                 if (scale > 6) {
                     scale = 6;

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/ShowColumnsCommand.java

@@ -190,7 +190,7 @@ public ShowResultSet doRun(ConnectContext ctx, StmtExecutor executor) throws Exc
                     continue;
                 }
                 final String columnName = col.getName();
-                final String columnType = col.getOriginType().toString().toLowerCase(Locale.ROOT);
+                final String columnType = col.getOriginType().hideVersionForVersionColumn(false);
                 final String isAllowNull = col.isAllowNull() ? "YES" : "NO";
                 final String isKey = col.isKey() ? "YES" : "NO";
                 final String defaultValue = col.getDefaultValue();

regression-test/data/external_table_p0/jdbc/test_doris_jdbc_catalog.out

@@ -136,7 +136,7 @@ double_col	double	Yes	true	\N	NONE
 decimal_col	decimal(10,5)	Yes	true	\N	NONE
 decimal_col2	decimal(30,10)	Yes	true	\N	NONE
 date_col	date	Yes	true	\N	NONE
-datetime_col	datetime(6)	Yes	true	\N	NONE
+datetime_col	datetime	Yes	true	\N	NONE
 char_col	char(85)	Yes	true	\N	NONE
 varchar_col	char(85)	Yes	true	\N	NONE
 json_col	text	Yes	true	\N	NONE

regression-test/data/nereids_p0/show/test_show_columns_command.out

@@ -3,11 +3,17 @@
 id	int	YES	YES	\N	
 name	text	YES	NO	\N	NONE
 score	float	YES	NO	\N	NONE
+event_date	date	YES	NO	\N	NONE
+event_time	datetime	YES	NO	\N	NONE
+decimal_col	decimal(10,2)	YES	NO	\N	NONE
 
 -- !cmd --
 id	int		YES	YES	\N			
 name	text		YES	NO	\N	NONE		
 score	float		YES	NO	\N	NONE		
+event_date	date		YES	NO	\N	NONE		
+event_time	datetime		YES	NO	\N	NONE		
+decimal_col	decimal(10,2)		YES	NO	\N	NONE		
 
 -- !cmd --
 score	float	YES	NO	\N	NONE

regression-test/suites/nereids_p0/show/test_show_columns_command.groovy

@@ -25,7 +25,10 @@ suite("test_show_columns_command", "nereids_p0") {
             CREATE TABLE IF NOT EXISTS ${dbName}.${tableName} (
                 id INT,
                 name STRING,
-                score FLOAT
+                score FLOAT,
+                event_date DATE,
+                event_time DATETIME,
+                decimal_col DECIMAL(10, 2)
             )
             DISTRIBUTED BY HASH(id) BUCKETS 3
             PROPERTIES ("replication_num" = "1");