[TD-2344]<fix>: fix bugs for percentile against float columns.

src/client/src/tscFunctionImpl.c

@@ -2589,10 +2589,11 @@ static void percentile_next_step(SQLFunctionCtx *pCtx) {
     // all data are null, set it completed
     if (pInfo->numOfElems == 0) {
       pResInfo->complete = true;
+    } else {
+      pInfo->pMemBucket = tMemBucketCreate(pCtx->inputBytes, pCtx->inputType, GET_DOUBLE_VAL(&pInfo->minval), GET_DOUBLE_VAL(&pInfo->maxval));
     }
 
     pInfo->stage += 1;
-    pInfo->pMemBucket = tMemBucketCreate(pCtx->inputBytes, pCtx->inputType, GET_DOUBLE_VAL(&pInfo->minval), GET_DOUBLE_VAL(&pInfo->maxval));
   } else {
     pResInfo->complete = true;
   }

src/query/src/qPercentile.c

@@ -234,7 +234,13 @@ int32_t tBucketIntHash(tMemBucket *pBucket, const void *value) {
 }
 
 int32_t tBucketDoubleHash(tMemBucket *pBucket, const void *value) {
-  double v = GET_DOUBLE_VAL(value);
+  double v = 0;
+  if (pBucket->type == TSDB_DATA_TYPE_FLOAT) {
+    v = GET_FLOAT_VAL(value);
+  } else {
+    v = GET_DOUBLE_VAL(value);
+  }
+
   int32_t index = -1;
 
   if (pBucket->range.dMinVal == DBL_MAX) {