diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index c114a45fbd01b4aadeb026bbec6276aec17154dd..992fdbd1378571398137deb2af223fd5d3bcfa77 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -1132,9 +1132,9 @@ static bool validateStateOper(const SValueNode* pVal) {
   if (TSDB_DATA_TYPE_BINARY != pVal->node.resType.type) {
     return false;
   }
-  return (0 == strcasecmp(varDataVal(pVal->datum.p), "GT") || 0 == strcasecmp(varDataVal(pVal->datum.p), "GE") ||
-          0 == strcasecmp(varDataVal(pVal->datum.p), "LT") || 0 == strcasecmp(varDataVal(pVal->datum.p), "LE") ||
-          0 == strcasecmp(varDataVal(pVal->datum.p), "EQ") || 0 == strcasecmp(varDataVal(pVal->datum.p), "NE"));
+  return (0 == strncasecmp(varDataVal(pVal->datum.p), "GT", 2) || 0 == strncasecmp(varDataVal(pVal->datum.p), "GE", 2) ||
+          0 == strncasecmp(varDataVal(pVal->datum.p), "LT", 2) || 0 == strncasecmp(varDataVal(pVal->datum.p), "LE", 2) ||
+          0 == strncasecmp(varDataVal(pVal->datum.p), "EQ", 2) || 0 == strncasecmp(varDataVal(pVal->datum.p), "NE", 2));
 }
 
 static int32_t translateStateCount(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 12b796c5ca37c3f7369352782c1ecb1694c9d0c0..3f8a5fce71987b4a92e75994ffa33abc0325bcaa 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -4416,17 +4416,17 @@ bool getStateFuncEnv(SFunctionNode* UNUSED_PARAM(pFunc), SFuncExecEnv* pEnv) {
 
 static int8_t getStateOpType(char* opStr) {
   int8_t opType;
-  if (strcasecmp(opStr, "LT") == 0) {
+  if (strncasecmp(opStr, "LT", 2) == 0) {
     opType = STATE_OPER_LT;
-  } else if (strcasecmp(opStr, "GT") == 0) {
+  } else if (strncasecmp(opStr, "GT", 2) == 0) {
     opType = STATE_OPER_GT;
-  } else if (strcasecmp(opStr, "LE") == 0) {
+  } else if (strncasecmp(opStr, "LE", 2) == 0) {
     opType = STATE_OPER_LE;
-  } else if (strcasecmp(opStr, "GE") == 0) {
+  } else if (strncasecmp(opStr, "GE", 2) == 0) {
     opType = STATE_OPER_GE;
-  } else if (strcasecmp(opStr, "NE") == 0) {
+  } else if (strncasecmp(opStr, "NE", 2) == 0) {
     opType = STATE_OPER_NE;
-  } else if (strcasecmp(opStr, "EQ") == 0) {
+  } else if (strncasecmp(opStr, "EQ", 2) == 0) {
     opType = STATE_OPER_EQ;
   } else {
     opType = STATE_OPER_INVALID;
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 509745383229314f0dddd206c10ce4554ef5cd23..2e32d903aa24ef9a39ce099b3edab792a132b9f9 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -2470,17 +2470,17 @@ typedef enum {
 
 static int8_t getStateOpType(char* opStr) {
   int8_t opType;
-  if (strcasecmp(opStr, "LT") == 0) {
+  if (strncasecmp(opStr, "LT", 2) == 0) {
     opType = STATE_OPER_LT;
-  } else if (strcasecmp(opStr, "GT") == 0) {
+  } else if (strncasecmp(opStr, "GT", 2) == 0) {
     opType = STATE_OPER_GT;
-  } else if (strcasecmp(opStr, "LE") == 0) {
+  } else if (strncasecmp(opStr, "LE", 2) == 0) {
     opType = STATE_OPER_LE;
-  } else if (strcasecmp(opStr, "GE") == 0) {
+  } else if (strncasecmp(opStr, "GE", 2) == 0) {
     opType = STATE_OPER_GE;
-  } else if (strcasecmp(opStr, "NE") == 0) {
+  } else if (strncasecmp(opStr, "NE", 2) == 0) {
     opType = STATE_OPER_NE;
-  } else if (strcasecmp(opStr, "EQ") == 0) {
+  } else if (strncasecmp(opStr, "EQ", 2) == 0) {
     opType = STATE_OPER_EQ;
   } else {
     opType = STATE_OPER_INVALID;