add default engine for TABLES (#799)

src/share/inner_table/ob_inner_table_schema.20001_20050.cpp

@@ -424,7 +424,7 @@ int ObInnerTableSchema::tables_schema(ObTableSchema &table_schema)
   table_schema.set_create_mem_version(1);
 
   if (OB_SUCC(ret)) {
-    if (OB_FAIL(table_schema.set_view_definition(R"__(select /*+ READ_CONSISTENCY(WEAK), use_merge(b, c, d, e)*/ 'def' as TABLE_CATALOG,                     b.database_name as TABLE_SCHEMA,                     a.table_name as TABLE_NAME,                     case when a.database_id & 0xFFFFFFFFFF = 2 then 'SYSTEM VIEW' when (a.table_type = 1 or a.table_type = 4) then 'VIEW' when a.table_type = 2 then 'SYSTEM TABLE' when a.table_type = 1 then 'INDEX' else 'BASE TABLE' end as TABLE_TYPE,                     NULL as ENGINE,                     NULL as VERSION,                     NULL as ROW_FORMAT,                     sum(c.row_count) as TABLE_ROWS,                     case when sum(c.row_count) = 0 then 0 else sum(c.data_size)/sum(c.row_count) end as AVG_ROW_LENGTH,                     sum(c.data_size) as DATA_LENGTH,                     NULL as MAX_DATA_LENGTH,                     NULL as INDEX_LENGTH,                     NULL as DATA_FREE,                     NULL as AUTO_INCREMENT,                     a.gmt_create as CREATE_TIME,                     a.gmt_modified as UPDATE_TIME,                     NULL as CHECK_TIME,                     d.collation as TABLE_COLLATION,                     cast(NULL as unsigned) as CHECKSUM,                     NULL as CREATE_OPTIONS,                     a.comment as TABLE_COMMENT                     from oceanbase.__all_virtual_table a                     inner join oceanbase.__all_virtual_database b on a.database_id = b.database_id                     left join oceanbase.__all_virtual_tenant_partition_meta_table c on a.table_id = c.table_id and c.tenant_id = effective_tenant_id() and a.tenant_id = c.tenant_id and c.role = 1                     inner join oceanbase.__all_collation d on a.collation_type = d.id                     where a.tenant_id = effective_tenant_id() and b.tenant_id = effective_tenant_id() and a.table_type != 5 and b.database_name != '__recyclebin' and b.in_recyclebin = 0 and 0 = sys_privilege_check('table_acc', effective_tenant_id(), b.database_name, a.table_name)                     group by a.table_id, b.database_name, a.table_name, a.table_type, a.gmt_create, a.gmt_modified, d.collation, a.comment )__"))) {
+    if (OB_FAIL(table_schema.set_view_definition(R"__(select /*+ READ_CONSISTENCY(WEAK), use_merge(b, c, d, e)*/ 'def' as TABLE_CATALOG,                     b.database_name as TABLE_SCHEMA,                     a.table_name as TABLE_NAME,                     case when a.database_id & 0xFFFFFFFFFF = 2 then 'SYSTEM VIEW' when (a.table_type = 1 or a.table_type = 4) then 'VIEW' when a.table_type = 2 then 'SYSTEM TABLE' when a.table_type = 1 then 'INDEX' else 'BASE TABLE' end as TABLE_TYPE,                     'OceanBase' as ENGINE,                     NULL as VERSION,                     NULL as ROW_FORMAT,                     sum(c.row_count) as TABLE_ROWS,                     case when sum(c.row_count) = 0 then 0 else sum(c.data_size)/sum(c.row_count) end as AVG_ROW_LENGTH,                     sum(c.data_size) as DATA_LENGTH,                     NULL as MAX_DATA_LENGTH,                     NULL as INDEX_LENGTH,                     NULL as DATA_FREE,                     NULL as AUTO_INCREMENT,                     a.gmt_create as CREATE_TIME,                     a.gmt_modified as UPDATE_TIME,                     NULL as CHECK_TIME,                     d.collation as TABLE_COLLATION,                     cast(NULL as unsigned) as CHECKSUM,                     NULL as CREATE_OPTIONS,                     a.comment as TABLE_COMMENT                     from oceanbase.__all_virtual_table a                     inner join oceanbase.__all_virtual_database b on a.database_id = b.database_id                     left join oceanbase.__all_virtual_tenant_partition_meta_table c on a.table_id = c.table_id and c.tenant_id = effective_tenant_id() and a.tenant_id = c.tenant_id and c.role = 1                     inner join oceanbase.__all_collation d on a.collation_type = d.id                     where a.tenant_id = effective_tenant_id() and b.tenant_id = effective_tenant_id() and a.table_type != 5 and b.database_name != '__recyclebin' and b.in_recyclebin = 0 and 0 = sys_privilege_check('table_acc', effective_tenant_id(), b.database_name, a.table_name)                     group by a.table_id, b.database_name, a.table_name, a.table_type, a.gmt_create, a.gmt_modified, d.collation, a.comment )__"))) {
       LOG_ERROR("fail to set view_definition", K(ret));
     }
   }

src/share/inner_table/ob_inner_table_schema_def.py

@@ -10517,7 +10517,7 @@ def_table_schema(
                     b.database_name as TABLE_SCHEMA,
                     a.table_name as TABLE_NAME,
                     case when a.database_id & 0xFFFFFFFFFF = 2 then 'SYSTEM VIEW' when (a.table_type = 1 or a.table_type = 4) then 'VIEW' when a.table_type = 2 then 'SYSTEM TABLE' when a.table_type = 1 then 'INDEX' else 'BASE TABLE' end as TABLE_TYPE,
-                    NULL as ENGINE,
+                    'OceanBase' as ENGINE,
                     NULL as VERSION,
                     NULL as ROW_FORMAT,
                     sum(c.row_count) as TABLE_ROWS,