fix: some problems of parser and planner

source/libs/parser/src/parAstParser.c

@@ -244,7 +244,10 @@ static int32_t collectMetaKeyFromDropTable(SCollectMetaKeyCxt* pCxt, SDropTableS
 }
 
 static int32_t collectMetaKeyFromAlterTable(SCollectMetaKeyCxt* pCxt, SAlterTableStmt* pStmt) {
-  int32_t code = reserveTableMetaInCache(pCxt->pParseCxt->acctId, pStmt->dbName, pStmt->tableName, pCxt->pMetaCache);
+  int32_t code = reserveDbCfgInCache(pCxt->pParseCxt->acctId, pStmt->dbName, pCxt->pMetaCache);
+  if (TSDB_CODE_SUCCESS == code) {
+    code = reserveTableMetaInCache(pCxt->pParseCxt->acctId, pStmt->dbName, pStmt->tableName, pCxt->pMetaCache);
+  }
   if (TSDB_CODE_SUCCESS == code) {
     code = reserveTableVgroupInCache(pCxt->pParseCxt->acctId, pStmt->dbName, pStmt->tableName, pCxt->pMetaCache);
   }

tests/script/tsim/insert/basic2.sim

@@ -26,8 +26,8 @@ endi
 
 print =============== step3-1 insert records into ct1
 sql insert into ct1 values('2022-05-03 16:59:00.010', 10, 20, 'n','n',30);
-sql insert into ct1 values('2022-05-03 16:59:00.011', 'N', 'n', 'N',"N",30);
-sql insert into ct1 values('2022-05-03 16:59:00.012', 'Nu', 'nul', 'Nul','NUL',30);
+sql insert into ct1 values('2022-05-03 16:59:00.011', 'null', 'null', 'N',"N",30);
+sql insert into ct1 values('2022-05-03 16:59:00.012', 'null', 'null', 'Nul','NUL',30);
 sql insert into ct1 values('2022-05-03 16:59:00.013', NULL, 'null', 'Null',null,30);
 sql insert into ct1 values('2022-05-03 16:59:00.014', NULL, 'NuLL', 'Null',NULL,30);