Merge pull request #3024 from taosdata/feature/query

[td-225] add unlock read lock of tsdb.

src/tsdb/src/tsdbRead.c

@@ -2406,6 +2406,8 @@ int32_t tsdbQuerySTableByTagCond(TSDB_REPO_T* tsdb, uint64_t uid, TSKEY skey, co
   } CATCH( code ) {
     CLEANUP_EXECUTE();
     terrno = code;
+    tsdbUnlockRepoMeta(tsdb);     // unlock tsdb in any cases
+
     goto _error;
     // TODO: more error handling
   } END_TRY