fix(frontend): allow INCLUDE payload without other columns

e2e_test/source_legacy/basic/kafka.slt

@@ -496,6 +496,16 @@ WITH (
     scan.startup.mode = 'earliest'
 ) FORMAT PLAIN ENCODE JSON
 
+statement ok
+CREATE TABLE test_include_payload_only
+INCLUDE payload
+WITH (
+    connector = 'kafka',
+    topic = 'kafka_1_partition_topic',
+    properties.bootstrap.server = 'message_queue:29092',
+    scan.startup.mode = 'earliest'
+) FORMAT PLAIN ENCODE JSON
+
 statement ok
 flush;
 
@@ -908,5 +918,8 @@ drop table source_with_rdkafka_props;
 statement ok
 drop table debezium_ignore_key;
 
+statement ok
+drop table test_include_payload_only;
+
 statement ok
 drop table test_include_payload;

src/frontend/src/handler/create_source.rs

@@ -646,12 +646,6 @@ pub fn handle_addition_columns(
         ))));
     }
 
-    let latest_col_id: ColumnId = columns
-        .iter()
-        .map(|col| col.column_desc.column_id)
-        .max()
-        .unwrap(); // there must be at least one column in the column catalog
-
     while let Some(item) = additional_columns.pop() {
         check_additional_column_compatibility(&item, source_schema)?;
 
@@ -667,7 +661,7 @@ pub fn handle_addition_columns(
             );
         }
         let col = build_additional_column_desc(
-            latest_col_id.next(),
+            ColumnId::placeholder(),
             connector_name.as_str(),
             item.column_type.real_value().as_str(),
             item.column_alias.map(|alias| alias.real_value()),
@@ -722,12 +716,6 @@ pub(crate) fn bind_all_columns(
                 "Remove the wildcard or use a source with external schema".to_string(),
             )));
         }
-        // FIXME(yuhao): cols_from_sql should be None is no `()` is given.
-        if cols_from_sql.is_empty() {
-            return Err(RwError::from(ProtocolError(
-                "Schema definition is required, either from SQL or schema registry.".to_string(),
-            )));
-        }
         let non_generated_sql_defined_columns = non_generated_sql_columns(col_defs_from_sql);
         match (&source_schema.format, &source_schema.row_encode) {
             (Format::DebeziumMongo, Encode::Json) => {
@@ -1547,6 +1535,13 @@ pub async fn bind_create_source_or_table_with_connector(
         &mut columns,
         false,
     )?;
+
+    if columns.is_empty() {
+        return Err(RwError::from(ProtocolError(
+            "Schema definition is required, either from SQL or schema registry.".to_string(),
+        )));
+    }
+
     // compatible with the behavior that add a hidden column `_rw_kafka_timestamp` to each message from Kafka source
     if is_create_source {
         // must behind `handle_addition_columns`