[td-1250]

src/client/inc/tscSubquery.h

@@ -30,7 +30,7 @@ void tscJoinQueryCallback(void* param, TAOS_RES* tres, int code);
 
 SJoinSupporter* tscCreateJoinSupporter(SSqlObj* pSql, SSubqueryState* pState, int32_t index);
 
-int32_t tscHandleMasterJoinQuery(SSqlObj* pSql);
+void tscHandleMasterJoinQuery(SSqlObj* pSql);
 
 int32_t tscHandleMasterSTableQuery(SSqlObj *pSql);
 

src/client/src/tscSubquery.c

@@ -1159,7 +1159,7 @@ static void tscRetrieveDataRes(void *param, TAOS_RES *tres, int code);
 static SSqlObj *tscCreateSTableSubquery(SSqlObj *pSql, SRetrieveSupport *trsupport, SSqlObj *prevSqlObj);
 
 // TODO
-int32_t tscLaunchJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter *pSupporter) {
+int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter *pSupporter) {
   SSqlCmd *   pCmd = &pSql->cmd;
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
   
@@ -1304,52 +1304,75 @@ int32_t tscLaunchJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
     pNewQueryInfo->type |= TSDB_QUERY_TYPE_SUBQUERY;
   }
 
-  return tscProcessSql(pNew);
+  return TSDB_CODE_SUCCESS;
 }
 
-int32_t tscHandleMasterJoinQuery(SSqlObj* pSql) {
+void tscHandleMasterJoinQuery(SSqlObj* pSql) {
   SSqlCmd* pCmd = &pSql->cmd;
+  SSqlRes* pRes = &pSql->res;
+
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
   assert((pQueryInfo->type & TSDB_QUERY_TYPE_SUBQUERY) == 0);
 
+  int32_t code = TSDB_CODE_SUCCESS;
+
   // todo add test
   SSubqueryState *pState = calloc(1, sizeof(SSubqueryState));
   if (pState == NULL) {
-    pSql->res.code = TSDB_CODE_TSC_OUT_OF_MEMORY;
-    return pSql->res.code;
+    code = TSDB_CODE_TSC_OUT_OF_MEMORY;
+    goto _error;
   }
 
   pState->numOfTotal = pQueryInfo->numOfTables;
   pState->numOfRemain = pState->numOfTotal;
 
+  bool hasEmptySub = false;
+
   tscDebug("%p start subquery, total:%d", pSql, pQueryInfo->numOfTables);
   for (int32_t i = 0; i < pQueryInfo->numOfTables; ++i) {
     SJoinSupporter *pSupporter = tscCreateJoinSupporter(pSql, pState, i);
     
     if (pSupporter == NULL) {  // failed to create support struct, abort current query
       tscError("%p tableIndex:%d, failed to allocate join support object, abort further query", pSql, i);
-      pState->numOfRemain = i;
-      pSql->res.code = TSDB_CODE_TSC_OUT_OF_MEMORY;
-      if (0 == i) {
-        taosTFree(pState);
-      }
-      return pSql->res.code;
+      code = TSDB_CODE_TSC_OUT_OF_MEMORY;
+      goto _error;
     }
     
-    int32_t code = tscLaunchJoinSubquery(pSql, i, pSupporter);
+    code = tscCreateJoinSubquery(pSql, i, pSupporter);
     if (code != TSDB_CODE_SUCCESS) {  // failed to create subquery object, quit query
       tscDestroyJoinSupporter(pSupporter);
-      pSql->res.code = TSDB_CODE_TSC_OUT_OF_MEMORY;
-      if (0 == i) {
-        taosTFree(pState);
-      }
+      goto _error;
+    }
+
+    SSqlObj* pSub = pSql->pSubs[i];
+    STableMetaInfo* pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSub->cmd, 0, 0);
+    if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo) && (pTableMetaInfo->vgroupList->numOfVgroups == 0)) {
+      hasEmptySub = true;
       break;
     }
   }
 
-  pSql->cmd.command = (pSql->numOfSubs <= 0)? TSDB_SQL_RETRIEVE_EMPTY_RESULT:TSDB_SQL_TABLE_JOIN_RETRIEVE;
-  
-  return TSDB_CODE_SUCCESS;
+  if (hasEmptySub) {  // at least one subquery is empty, do nothing and return
+    freeJoinSubqueryObj(pSql);
+    pSql->cmd.command = TSDB_SQL_RETRIEVE_EMPTY_RESULT;
+    (*pSql->fp)(pSql->param, pSql, 0);
+  } else {
+    for (int32_t i = 0; i < pSql->numOfSubs; ++i) {
+      SSqlObj* pSub = pSql->pSubs[i];
+      if ((code = tscProcessSql(pSub)) != TSDB_CODE_SUCCESS) {
+        pState->numOfRemain = i - 1;  // the already sent reques will continue and do not go to the error process routine
+        break;
+      }
+    }
+
+    pSql->cmd.command = TSDB_SQL_TABLE_JOIN_RETRIEVE;
+  }
+
+  return;
+
+  _error:
+  pRes->code = code;
+  tscQueueAsyncRes(pSql);
 }
 
 static void doCleanupSubqueries(SSqlObj *pSql, int32_t numOfSubs, SSubqueryState* pState) {

tests/script/general/parser/join.sim

@@ -482,15 +482,31 @@ sql insert into um2 using m2 tags(9) values(1000001, 10)(2000000, 20);
 
 sql_error select count(*) from m1,m2 where m1.a=m2.a and m1.ts=m2.ts;
 
-#empty table join test, add for no result join test
+print ====> empty table/empty super-table join test, add for no result join test
 sql create database ux1;
 sql use ux1;
 sql create table m1(ts timestamp, k int) tags(a binary(12), b int);
 sql create table tm0 using m1 tags('abc', 1);
 sql create table m2(ts timestamp, k int) tags(a int, b binary(12));
+
+sql select count(*) from m1, m2 where m1.ts=m2.ts and m1.b=m2.a;
+if $rows != 0 then
+  return -1
+endi
+
 sql create table tm2 using m2 tags(2, 'abc');
 sql select count(*) from tm0, tm2 where tm0.ts=tm2.ts;
-sql select count(*) from m1, m2 where m1.ts=m2.ts and m1.b=m2.a
+if $rows != 0 then
+  return -1
+endi
+
+sql select count(*) from m1, m2 where m1.ts=m2.ts and m1.b=m2.a;
+if $rows != 0 then
+  return -1
+endi
+
+sql drop table tm2;
+sql select count(*) from m1, m2 where m1.ts=m2.ts and m1.b=m2.a;
 sql drop database ux1;
 
 system sh/exec.sh -n dnode1 -s stop -x SIGINT
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