[TD-2159]<fix>: fix bugs in limit/offset in group by normal columns.

src/client/src/tscFunctionImpl.c

@@ -681,7 +681,7 @@ static int32_t firstFuncRequired(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end, i
   }
   
   // no result for first query, data block is required
-  if (GET_RES_INFO(pCtx)->numOfRes <= 0) {
+  if (GET_RES_INFO(pCtx) == NULL || GET_RES_INFO(pCtx)->numOfRes <= 0) {
     return BLK_DATA_ALL_NEEDED;
   } else {
     return BLK_DATA_NO_NEEDED;
@@ -693,7 +693,7 @@ static int32_t lastFuncRequired(SQLFunctionCtx *pCtx, TSKEY start, TSKEY end, in
     return BLK_DATA_NO_NEEDED;
   }
   
-  if (GET_RES_INFO(pCtx)->numOfRes <= 0) {
+  if (GET_RES_INFO(pCtx) == NULL || GET_RES_INFO(pCtx)->numOfRes <= 0) {
     return BLK_DATA_ALL_NEEDED;
   } else {
     return BLK_DATA_NO_NEEDED;

src/query/src/qExecutor.c

@@ -5583,6 +5583,8 @@ static void tableIntervalProcess(SQInfo *pQInfo, STableQueryInfo* pTableInfo) {
     pQuery->rec.rows = 0;
     copyFromWindowResToSData(pQInfo, &pRuntimeEnv->windowResInfo);
     clearFirstNTimeWindow(pRuntimeEnv, pQInfo->groupIndex);
+
+    limitResults(pRuntimeEnv);
   }
 }
 

tests/script/general/parser/groupby.sim

@@ -62,7 +62,7 @@ while $i < $half
     $nchar = $nchar . $c
     $nchar = $nchar . '
 
-    sql insert into $tb values ($tstart , $c , $c , $c , $c , $c , $c , $c , $binary , $nchar ) $tb1 values ($tstart , $c , $c , $c , $c , $c , $c , $c , $binary , $nchar )
+    sql insert into $tb values ($tstart , $c , $c , $x , $x , $c , $c , $c , $binary , $nchar ) $tb1 values ($tstart , $c , $c , $c , $c , $c , $c , $c , $binary , $nchar )
     $tstart = $tstart + 1
     $x = $x + 1
   endw
@@ -430,8 +430,39 @@ if $data97 != @group_tb0@ then
   return -1
 endi
 
-print ---------------------------------> group by binary|nchar data add cases
+sql select count(*),first(ts),last(ts),min(c3) from group_tb1 group by c4;
+if $rows != 10000 then
+  return -1
+endi
+
+if $data00 != 1 then
+  return -1
+endi
+
+if $data01 != @70-01-01 08:01:40.000@ then
+  return -1
+endi
+
+if $data02 !=  @70-01-01 08:01:40.000@ then
+  return -1
+endi
 
+if $data03 != 0 then
+  return -1
+endi
+
+sql select count(*),first(ts),last(ts),min(c3) from group_tb1 group by c4 limit 1;
+if $rows != 1 then
+  return -1
+endi
+
+sql select count(*),first(ts),last(ts),min(c3),max(c3),sum(c3),avg(c3),sum(c4)/count(c4) from group_tb1 group by c8;
+if $rows != 10000 then
+  return -1
+endi
+
+print ---------------------------------> group by binary|nchar data add cases
+sql select count(*) from group_tb1 group by c8;
 
 #=========================== group by multi tags ======================
 sql create table st (ts timestamp, c int) tags (t1 int, t2 int, t3 int, t4 int);