fix some compile warning

include/common/tdataformat.h

@@ -87,7 +87,7 @@ typedef struct {
 #define schemaColAt(s, i) ((s)->columns + i)
 #define tdFreeSchema(s) tfree((s))
 
-STSchema *tdDupSchema(STSchema *pSchema);
+STSchema *tdDupSchema(const STSchema *pSchema);
 int       tdEncodeSchema(void **buf, STSchema *pSchema);
 void *    tdDecodeSchema(void *buf, STSchema **pRSchema);
 

include/os/osDir.h

@@ -20,7 +20,7 @@
 extern "C" {
 #endif
 
-void taosRemoveDir(char *dirname);
+void taosRemoveDir(const char *dirname);
 bool taosDirExist(char *dirname);
 bool taosMkDir(char *dirname);
 void taosRemoveOldFiles(char *dirname, int32_t keepDays);

source/common/src/tdataformat.c

@@ -48,7 +48,7 @@ int tdAllocMemForCol(SDataCol *pCol, int maxPoints) {
 /**
  * Duplicate the schema and return a new object
  */
-STSchema *tdDupSchema(STSchema *pSchema) {
+STSchema *tdDupSchema(const STSchema *pSchema) {
 
   int tlen = sizeof(STSchema) + sizeof(STColumn) * schemaNCols(pSchema);
   STSchema *tSchema = (STSchema *)malloc(tlen);

source/os/src/osDir.c

@@ -34,7 +34,7 @@
 #include <unistd.h>
 #include <wordexp.h>
 
-void taosRemoveDir(char *dirname) {
+void taosRemoveDir(const char *dirname) {
   DIR *dir = opendir(dirname);
   if (dir == NULL) return;