sandynz commented on code in PR #19455:
URL: https://github.com/apache/shardingsphere/pull/19455#discussion_r927519441


##########
shardingsphere-kernel/shardingsphere-data-pipeline/shardingsphere-data-pipeline-core/src/main/java/org/apache/shardingsphere/data/pipeline/core/prepare/datasource/PrepareTargetSchemasParameter.java:
##########
@@ -30,7 +32,13 @@
 @Getter
 public final class PrepareTargetSchemasParameter {
     
-    private final TaskConfiguration taskConfig;
+    private final List<String> logicTableNames;
+    
+    private final DatabaseType targetDatabaseType;
+    
+    private final String databaseName;
+    
+    private final PipelineDataSourceConfiguration 
pipelineDataSourceConfiguration;

Review Comment:
   `pipelineDataSourceConfiguration` could be `dataSourceConfig`



##########
shardingsphere-kernel/shardingsphere-data-pipeline/shardingsphere-data-pipeline-core/src/main/java/org/apache/shardingsphere/data/pipeline/scenario/rulealtered/RuleAlteredJobPreparer.java:
##########
@@ -142,10 +141,19 @@ private void prepareTarget(final RuleAlteredJobContext 
jobContext) {
             log.info("dataSourcePreparer null, ignore prepare target");
             return;
         }
+        DatabaseType sourceDatabaseType = 
DatabaseTypeFactory.getInstance(jobConfig.getSourceDatabaseType());
+        DatabaseType targetDatabaseType = 
DatabaseTypeFactory.getInstance(jobConfig.getTargetDatabaseType());
+        if (!sourceDatabaseType.isSchemaAvailable() || 
!targetDatabaseType.isSchemaAvailable()) {
+            log.info("prepareTargetSchemas, one of source or target database 
type schema is not available, ignore");
+            return;
+        }

Review Comment:
   Looks it could not return, since it just could ignore creating schema but 
not creating table.
   
   Could we add an judgement method to check whether it need to create schema 
or not? And then use it to precheck for `prepareTargetSchemas`.



##########
shardingsphere-kernel/shardingsphere-data-pipeline/shardingsphere-data-pipeline-core/src/main/java/org/apache/shardingsphere/data/pipeline/core/prepare/datasource/PrepareTargetTablesParameter.java:
##########
@@ -31,28 +30,23 @@
 @Getter
 public final class PrepareTargetTablesParameter {
     
-    private final TaskConfiguration taskConfig;
+    private final String databaseName;
     
     private final JobDataNodeLine tablesFirstDataNodes;
     
+    private final PipelineDataSourceConfiguration 
pipelineDataSourceConfiguration;
+    

Review Comment:
   `pipelineDataSourceConfiguration` could be `dataSourceConfig`



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