fix alter table coredump

src/tsdb/src/tsdbMeta.c

@@ -552,6 +552,7 @@ void tsdbUnRefTable(STable *pTable) {
 
 void tsdbUpdateTableSchema(STsdbRepo *pRepo, STable *pTable, STSchema *pSchema, bool insertAct) {
   ASSERT(TABLE_TYPE(pTable) != TSDB_STREAM_TABLE && TABLE_TYPE(pTable) != TSDB_SUPER_TABLE);
+  STsdbMeta *pMeta = pRepo->tsdbMeta;
 
   STable *pCTable = (TABLE_TYPE(pTable) == TSDB_CHILD_TABLE) ? pTable->pSuper : pTable;
   ASSERT(schemaVersion(pSchema) > schemaVersion(pCTable->schema[pCTable->numOfSchemas - 1]));
@@ -565,6 +566,9 @@ void tsdbUpdateTableSchema(STsdbRepo *pRepo, STable *pTable, STSchema *pSchema,
     memmove(pCTable->schema, pCTable->schema + 1, sizeof(STSchema *) * (TSDB_MAX_TABLE_SCHEMAS - 1));
     pCTable->schema[pCTable->numOfSchemas - 1] = pSchema;
   }
+
+  if (schemaNCols(pSchema) > pMeta->maxCols) pMeta->maxCols = schemaNCols(pSchema);
+  if (schemaTLen(pSchema) > pMeta->maxRowBytes) pMeta->maxRowBytes = schemaTLen(pSchema);
   taosWUnLockLatch(&(pCTable->latch));
 
   if (insertAct) {