strongduanmu commented on issue #21230:
URL:
https://github.com/apache/shardingsphere/issues/21230#issuecomment-1260504626
I have test the master branch, this exception is caused by following logic.
```java
/**
* Schema refresher for alter view statement.
*/
public final class AlterViewStatementSchemaRefresher implements
MetaDataRefresher<AlterViewStatement> {
@Override
public Optional<MetaDataRefreshedEvent> refresh(final
ShardingSphereDatabase database, final Collection<String> logicDataSourceNames,
final String schemaName,
final AlterViewStatement sqlStatement, final ConfigurationProperties props)
throws SQLException {
String viewName =
sqlStatement.getView().getTableName().getIdentifier().getValue();
String viewDefinition =
sqlStatement.getViewSQL().substring(sqlStatement.getViewSQL().substring(0,
sqlStatement.getViewSQL().indexOf(" as ")).length() + 4).trim();
SchemaAlteredEvent event = new
SchemaAlteredEvent(database.getName(), schemaName);
Optional<SimpleTableSegment> renameView =
AlterViewStatementHandler.getRenameView(sqlStatement);
```
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