fix: view name parse issue

npe when no database selected

Author: LUAgam

src/main/java/com/actiontech/dble/meta/ViewMetaParser.java

@@ -73,7 +73,6 @@ public String getViewName() {
                     continue;
                 case '/':
                     offset = ParseUtil.comment(originalSql, offset);
-                    offset++;
                     break;
                 case 'a':
                     offset = offset + 5;

src/main/java/com/actiontech/dble/route/parser/druid/impl/ddl/DruidAlterViewParser.java

@@ -31,7 +31,8 @@ public class DruidAlterViewParser extends DruidImplicitCommitParser {
     @Override
     public SchemaConfig doVisitorParse(SchemaConfig schema, RouteResultset rrs, SQLStatement stmt, ServerSchemaStatVisitor visitor, ShardingService service, boolean isExplain) throws SQLException {
         String sql = rrs.getStatement();
-        vm = new ViewMeta(schema.getName(), sql, ProxyMeta.getInstance().getTmManager());
+        String schemaName = schema == null ? null : schema.getName();
+        vm = new ViewMeta(schemaName, sql, ProxyMeta.getInstance().getTmManager());
         vm.init();
         checkSchema(vm.getSchema());
         PlanNode oldViewNode = ProxyMeta.getInstance().getTmManager().getSyncView(vm.getSchema(), vm.getViewName());

src/main/java/com/actiontech/dble/route/parser/druid/impl/ddl/DruidCreateOrReplaceViewParser.java

@@ -32,7 +32,8 @@ public class DruidCreateOrReplaceViewParser extends DruidImplicitCommitParser {
     @Override
     public SchemaConfig doVisitorParse(SchemaConfig schema, RouteResultset rrs, SQLStatement stmt, ServerSchemaStatVisitor visitor, ShardingService service, boolean isExplain) throws SQLException {
         String sql = rrs.getStatement();
-        vm = new ViewMeta(schema.getName(), sql, ProxyMeta.getInstance().getTmManager());
+        String schemaName = schema == null ? null : schema.getName();
+        vm = new ViewMeta(schemaName, sql, ProxyMeta.getInstance().getTmManager());
         vm.init();
         SQLCreateViewStatement createViewStatement = (SQLCreateViewStatement) stmt;
         checkSchema(vm.getSchema());