[fix](planner) ctas should not change any meta of column in source table

fe/fe-core/src/main/java/org/apache/doris/analysis/CreateTableAsSelectStmt.java

@@ -17,6 +17,7 @@
 
 package org.apache.doris.analysis;
 
+import org.apache.doris.catalog.Column;
 import org.apache.doris.catalog.ScalarType;
 import org.apache.doris.catalog.Type;
 import org.apache.doris.common.Config;
@@ -82,8 +83,9 @@ public void analyze(Analyzer analyzer) throws UserException {
         Preconditions.checkArgument(outputs.size() == queryStmt.getResultExprs().size());
         for (int i = 0; i < outputs.size(); ++i) {
             if (queryStmt.getResultExprs().get(i).getSrcSlotRef() != null) {
-                queryStmt.getResultExprs().get(i).getSrcSlotRef().getColumn()
-                        .setIsAllowNull(outputs.get(i).isNullable());
+                Column columnCopy =  new Column(queryStmt.getResultExprs().get(i).getSrcSlotRef().getColumn());
+                columnCopy.setIsAllowNull(outputs.get(i).isNullable());
+                queryStmt.getResultExprs().get(i).getSrcSlotRef().getDesc().setColumn(columnCopy);
             }
             if (Config.enable_date_conversion) {
                 if (queryStmt.getResultExprs().get(i).getType() == Type.DATE) {

regression-test/suites/ddl_p0/test_ctas.groovy

@@ -230,16 +230,21 @@ suite("test_ctas") {
         sql 'insert into a values(1, \'ww\'), (2, \'zs\');'
         sql 'insert into b values(1, 22);'
 
-        sql 'create table c properties("replication_num"="1") as select a.id, a.name, b.age from a left join b on a.id = b.id;'
+        sql 'set enable_nereids_planner=false'
+
+        sql 'create table c properties("replication_num"="1") as select b.id, a.name, b.age from a left join b on a.id = b.id;'
 
-        String desc = sql 'desc c'
-        assertTrue(desc.contains('Yes'))
+        String descC = sql 'desc c'
+        assertTrue(descC.contains('Yes'))
+        String descB = sql 'desc b'
+        assertTrue(descB.contains('No'))
+
         sql '''create table test_date_v2 
         properties (
                 "replication_num"="1"
         ) as select to_date('20250829');
         '''
-        desc = sql 'desc test_date_v2'
+        String desc = sql 'desc test_date_v2'
         assertTrue(desc.contains('Yes'))
     } finally {
         sql 'drop table a'

regression-test/suites/nereids_p0/create_table/test_ctas.groovy

@@ -222,5 +222,56 @@ suite("nereids_test_ctas") {
     """
 
     qt_select """select * from ${table2} order by c1;"""
+
+    try {
+        sql "drop table if exists a"
+        sql "drop table if exists b"
+        sql "drop table if exists c"
+        sql "drop table if exists test_date_v2"
+        sql '''create table a (
+                id int not null,
+                        name varchar(20) not null
+        )
+        distributed by hash(id) buckets 4
+        properties (
+                "replication_num"="1"
+        );
+        '''
+
+        sql '''create table b (
+                id int not null,
+                        age int not null
+        )
+        distributed by hash(id) buckets 4
+        properties (
+                "replication_num"="1"
+        );
+        '''
+
+        sql 'insert into a values(1, \'ww\'), (2, \'zs\');'
+        sql 'insert into b values(1, 22);'
+
+        sql 'set enable_nereids_planner=false'
+
+        sql 'create table c properties("replication_num"="1") as select b.id, a.name, b.age from a left join b on a.id = b.id;'
+
+        String descC = sql 'desc c'
+        assertTrue(descC.contains('Yes'))
+        String descB = sql 'desc b'
+        assertTrue(descB.contains('No'))
+
+        sql '''create table test_date_v2 
+        properties (
+                "replication_num"="1"
+        ) as select to_date('20250829');
+        '''
+        String desc = sql 'desc test_date_v2'
+        assertTrue(desc.contains('Yes'))
+    } finally {
+        sql 'drop table a'
+        sql 'drop table b'
+        sql 'drop table c'
+        sql 'drop table test_date_v2'
+    }
 }