Update src/Processors/QueryPlan/Optimizations/RuntimeDataflowStatistics.h

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: nickitat

src/Processors/QueryPlan/Optimizations/RuntimeDataflowStatistics.h

@@ -94,9 +94,10 @@ class RuntimeDataflowStatisticsCacheUpdater
 
     void recordAggregationKeySizes(const Aggregator & aggregator, const Block & block);
 
-    /// Returns true if the current read block was chosen for sampling.
+    /// Updates should_continue_sampling to true if the current read block is chosen for sampling.
     /// It is needed because in general we read each block in multiple steps because of prewhere.
-    /// If the first part of the block was chosen for sampling, we want to record statistics for the whole block in later steps.
+    /// If the first part of the block was chosen for sampling, we want to record statistics for the whole block in later steps,
+    /// so should_continue_sampling remains true for subsequent calls for the same logical block.
     void recordInputColumns(
         const ColumnsWithTypeAndName & input_columns,
         const NamesAndTypesList & part_columns,