support join for json tag

src/query/src/qTsbuf.c

@@ -267,7 +267,8 @@ static void writeDataToDisk(STSBuf* pTSBuf) {
   metaLen += (int32_t)fwrite(&pBlock->tag.nType, 1, sizeof(pBlock->tag.nType), pTSBuf->f);
 
   int32_t trueLen = pBlock->tag.nLen;
-  if (pBlock->tag.nType == TSDB_DATA_TYPE_BINARY || pBlock->tag.nType == TSDB_DATA_TYPE_NCHAR) {
+  if (pBlock->tag.nType == TSDB_DATA_TYPE_BINARY || pBlock->tag.nType == TSDB_DATA_TYPE_NCHAR ||
+      pBlock->tag.nType == TSDB_DATA_TYPE_JSON) {
     metaLen += (int32_t)fwrite(&pBlock->tag.nLen, 1, sizeof(pBlock->tag.nLen), pTSBuf->f);
     metaLen += (int32_t)fwrite(pBlock->tag.pz, 1, (size_t)pBlock->tag.nLen, pTSBuf->f);
   } else if (pBlock->tag.nType == TSDB_DATA_TYPE_FLOAT) {