enable different value type of the same key in json

src/common/src/texpr.c

@@ -289,7 +289,7 @@ static void exprTreeToBinaryImpl(SBufferWriter* bw, tExprNode* expr) {
     tVariant* pVal = expr->pVal;
     
     tbufWriteUint32(bw, pVal->nType);
-    if (pVal->nType == TSDB_DATA_TYPE_BINARY || Val->nType == TSDB_DATA_TYPE_NCHAR) {
+    if (pVal->nType == TSDB_DATA_TYPE_BINARY || pVal->nType == TSDB_DATA_TYPE_NCHAR) {
       tbufWriteInt32(bw, pVal->nLen);
       tbufWrite(bw, pVal->pz, pVal->nLen);
     } else {