validate tag filter status

source/libs/executor/inc/indexoperator.h

@@ -16,5 +16,8 @@
 #include "filter.h"
 #include "tglobal.h"
 
+typedef enum { SFLT_NOT_INDEX, SFLT_COARSE_INDEX, SFLT_ACCURATE_INDEX } SIdxFltStatus;
+
+SIdxFltStatus idxGetFltStatus(SNode *pFilterNode);
 // construct tag filter operator later
 int32_t doFilterTag(const SNode *pFilterNode, SArray *resutl);

source/libs/executor/src/indexoperator.c

@@ -188,3 +188,11 @@ int32_t doFilterTag(const SNode *pFilterNode, SArray *result) {
 
   return code;
 }
+
+SIdxFltStatus idxGetFltStatus(SNode *pFilterNode) {
+  if (pFilterNode == NULL) {
+    return SFLT_NOT_INDEX;
+  }
+  // impl later
+  return SFLT_ACCURATE_INDEX;
+}