fix: Case sensitive comparison of field names (#TS-1609)

src/client/src/tscSQLParser.c

@@ -1857,7 +1857,7 @@ int32_t validateOneColumn(SSqlCmd* pCmd, TAOS_FIELD* pColField) {
 
   // field name must be unique
   for (int32_t i = 0; i < numOfTags + numOfCols; ++i) {
-    if (strncasecmp(pColField->name, pSchema[i].name, sizeof(pColField->name) - 1) == 0) {
+    if (strncmp(pColField->name, pSchema[i].name, sizeof(pColField->name) - 1) == 0) {
       //return tscErrorMsgWithCode(TSDB_CODE_TSC_DUP_COL_NAMES, tscGetErrorMsgPayload(pCmd), pColField->name, NULL);
       return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), "duplicated column names");
     }

src/mnode/src/mnodeTable.c

@@ -1235,7 +1235,7 @@ static int32_t mnodeProcessDropSuperTableMsg(SMnodeMsg *pMsg) {
 static int32_t mnodeFindSuperTableTagIndex(SSTableObj *pStable, const char *tagName) {
   SSchema *schema = (SSchema *) pStable->schema;
   for (int32_t tag = 0; tag < pStable->numOfTags; tag++) {
-    if (strcasecmp(schema[pStable->numOfColumns + tag].name, tagName) == 0) {
+    if (strcmp(schema[pStable->numOfColumns + tag].name, tagName) == 0) {
       return tag;
     }
   }
@@ -1388,7 +1388,7 @@ static int32_t mnodeModifySuperTableTagName(SMnodeMsg *pMsg, char *oldTagName, c
 static int32_t mnodeFindSuperTableColumnIndex(SSTableObj *pStable, char *colName) {
   SSchema *schema = (SSchema *) pStable->schema;
   for (int32_t col = 0; col < pStable->numOfColumns; col++) {
-    if (strcasecmp(schema[col].name, colName) == 0) {
+    if (strcmp(schema[col].name, colName) == 0) {
       return col;
     }
   }