Use PrefixSort in Window operator (facebookincubator#10417)

Summary: Benchmark run results https://gist.github.com/aditi-pandit/25d2f6224c97d9d9a32cdd97e05528fa Pull Request resolved: facebookincubator#10417 Reviewed By: kagamiori Differential Revision: D64278437 Pulled By: xiaoxmeng fbshipit-source-id: 491e0cb4298a4749e42c6057f64aac55e761a7c4
PHILO-HE · Oct 16, 2024 · 1dd1e3e · 1dd1e3e
1 parent de1b2ae
commit 1dd1e3e
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Showing 10 changed files with 463 additions and 25 deletions.
diff --git a/velox/exec/SortWindowBuild.cpp b/velox/exec/SortWindowBuild.cpp
@@ -20,7 +20,7 @@
 namespace facebook::velox::exec {
 
 namespace {
-std::vector<CompareFlags> makeSpillCompareFlags(
+std::vector<CompareFlags> makeCompareFlags(
     int32_t numPartitionKeys,
     const std::vector<core::SortOrder>& sortingOrders) {
   std::vector<CompareFlags> compareFlags;
@@ -42,14 +42,15 @@ std::vector<CompareFlags> makeSpillCompareFlags(
 SortWindowBuild::SortWindowBuild(
     const std::shared_ptr<const core::WindowNode>& node,
     velox::memory::MemoryPool* pool,
+    common::PrefixSortConfig&& prefixSortConfig,
     const common::SpillConfig* spillConfig,
     tsan_atomic<bool>* nonReclaimableSection,
     folly::Synchronized<common::SpillStats>* spillStats)
     : WindowBuild(node, pool, spillConfig, nonReclaimableSection),
       numPartitionKeys_{node->partitionKeys().size()},
-      spillCompareFlags_{
-          makeSpillCompareFlags(numPartitionKeys_, node->sortingOrders())},
+      compareFlags_{makeCompareFlags(numPartitionKeys_, node->sortingOrders())},
       pool_(pool),
+      prefixSortConfig_(prefixSortConfig),
       spillStats_(spillStats) {
   VELOX_CHECK_NOT_NULL(pool_);
   allKeyInfo_.reserve(partitionKeyInfo_.size() + sortKeyInfo_.size());
@@ -145,8 +146,8 @@ void SortWindowBuild::setupSpiller() {
       Spiller::Type::kOrderByInput,
       data_.get(),
       inputType_,
-      spillCompareFlags_.size(),
-      spillCompareFlags_,
+      compareFlags_.size(),
+      compareFlags_,
       spillConfig_,
       spillStats_);
 }
@@ -217,12 +218,8 @@ void SortWindowBuild::sortPartitions() {
   RowContainerIterator iter;
   data_->listRows(&iter, numRows_, sortedRows_.data());
 
-  std::sort(
-      sortedRows_.begin(),
-      sortedRows_.end(),
-      [this](const char* leftRow, const char* rightRow) {
-        return compareRowsWithKeys(leftRow, rightRow, allKeyInfo_);
-      });
+  PrefixSort::sort(
+      sortedRows_, pool_, data_.get(), compareFlags_, prefixSortConfig_);
 
   computePartitionStartRows();
 }

diff --git a/velox/exec/SortWindowBuild.h b/velox/exec/SortWindowBuild.h
@@ -16,6 +16,7 @@
 
 #pragma once
 
+#include "velox/exec/PrefixSort.h"
 #include "velox/exec/Spiller.h"
 #include "velox/exec/WindowBuild.h"
 
@@ -29,6 +30,7 @@ class SortWindowBuild : public WindowBuild {
   SortWindowBuild(
       const std::shared_ptr<const core::WindowNode>& node,
       velox::memory::MemoryPool* pool,
+      common::PrefixSortConfig&& prefixSortConfig,
       const common::SpillConfig* spillConfig,
       tsan_atomic<bool>* nonReclaimableSection,
       folly::Synchronized<common::SpillStats>* spillStats);
@@ -82,10 +84,14 @@ class SortWindowBuild : public WindowBuild {
   // keys are set to default values. Compare flags for sorting keys match
   // sorting order specified in the plan node.
   //
-  // Used to sort 'data_' while spilling.
-  const std::vector<CompareFlags> spillCompareFlags_;
+  // Used to sort 'data_' while spilling and in Prefix sort.
+  const std::vector<CompareFlags> compareFlags_;
 
   memory::MemoryPool* const pool_;
+
+  // Config for Prefix-sort.
+  const common::PrefixSortConfig prefixSortConfig_;
+
   folly::Synchronized<common::SpillStats>* const spillStats_;
 
   // allKeyInfo_ is a combination of (partitionKeyInfo_ and sortKeyInfo_).

diff --git a/velox/exec/Window.cpp b/velox/exec/Window.cpp
@@ -56,7 +56,14 @@ Window::Window(
     }
   } else {
     windowBuild_ = std::make_unique<SortWindowBuild>(
-        windowNode, pool(), spillConfig, &nonReclaimableSection_, &spillStats_);
+        windowNode,
+        pool(),
+        common::PrefixSortConfig{
+            driverCtx->queryConfig().prefixSortNormalizedKeyMaxBytes(),
+            driverCtx->queryConfig().prefixSortMinRows()},
+        spillConfig,
+        &nonReclaimableSection_,
+        &spillStats_);
   }
 }
 

diff --git a/velox/exec/benchmarks/CMakeLists.txt b/velox/exec/benchmarks/CMakeLists.txt
@@ -95,3 +95,16 @@ target_link_libraries(
   velox_vector_fuzzer
   velox_vector_test_lib
   ${FOLLY_BENCHMARK})
+
+add_executable(velox_window_prefixsort_benchmark WindowPrefixSortBenchmark.cpp)
+
+target_link_libraries(
+  velox_window_prefixsort_benchmark
+  velox_aggregates
+  velox_exec
+  velox_exec_test_lib
+  velox_hive_connector
+  velox_vector_fuzzer
+  velox_vector_test_lib
+  velox_window
+  ${FOLLY_BENCHMARK})