Fix UBsan reports in quantileTiming

UBsan reports [1]:

    ../src/AggregateFunctions/QuantileTiming.h:442:27: runtime error: 1.84467e+19 is outside the range of representable values of type 'unsigned long' Received signal -3 Received signal Unknown signal (-3)

  [1]: https://clickhouse-test-reports.s3.yandex.net/19971/e15f5d9cb5b36482d1ae9ca069074fb200f2ab37/fuzzer_ubsan/report.html#fail1

Follow-up for: #19394

src/AggregateFunctions/QuantileTiming.h

@@ -32,6 +32,8 @@ namespace ErrorCodes
   * - a histogram (that is, value -> number), consisting of two parts
   * -- for values from 0 to 1023 - in increments of 1;
   * -- for values from 1024 to 30,000 - in increments of 16;
+  *
+  * NOTE: 64-bit integer weight can overflow, see also QantileExactWeighted.h::get()
   */
 
 #define TINY_MAX_ELEMS 31
@@ -396,9 +398,9 @@ namespace detail
         /// Get the value of the `level` quantile. The level must be between 0 and 1.
         UInt16 get(double level) const
         {
-            UInt64 pos = std::ceil(count * level);
+            double pos = std::ceil(count * level);
 
-            UInt64 accumulated = 0;
+            double accumulated = 0;
             Iterator it(*this);
 
             while (it.isValid())
@@ -422,9 +424,9 @@ namespace detail
             const auto * indices_end = indices + size;
             const auto * index = indices;
 
-            UInt64 pos = std::ceil(count * levels[*index]);
+            double pos = std::ceil(count * levels[*index]);
 
-            UInt64 accumulated = 0;
+            double accumulated = 0;
             Iterator it(*this);
 
             while (it.isValid())

tests/queries/0_stateless/01690_quantilesTiming_ubsan.reference

@@ -0,0 +1,2 @@
+[0]
+[0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1]

tests/queries/0_stateless/01690_quantilesTiming_ubsan.sql

@@ -0,0 +1,31 @@
+-- NOTE: that due to overflows it may give different result before
+-- quantilesTimingWeighted() had been converted to double:
+--
+-- Before:
+--
+--     SELECT quantilesTimingWeighted(1)(number, 9223372036854775807)
+--     FROM numbers(2)
+--
+--     ┌─quantilesTimingWeighted(1)(number, 9223372036854775807)─┐
+--     │ [1]                                                     │
+--     └─────────────────────────────────────────────────────────┘
+--
+-- After:
+--
+--     SELECT quantilesTimingWeighted(1)(number, 9223372036854775807)
+--     FROM numbers(2)
+--
+--     ┌─quantilesTimingWeighted(1)(number, 9223372036854775807)─┐
+--     │ [0]                                                     │
+--     └─────────────────────────────────────────────────────────┘
+
+SELECT quantilesTimingWeighted(0.1)(number, 9223372036854775807) FROM numbers(2);
+
+-- same UB, but in the inner loop
+SELECT quantilesTimingWeighted(0, 0.001, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.6, 0.7, 0.8, 0.9, 0.95, 0.99, 0.999, 1)(number, 9223372036854775807)
+FROM
+(
+    SELECT number
+    FROM system.numbers
+    LIMIT 100
+);