added bitmapMin and bitmapMax

dbms/src/AggregateFunctions/AggregateFunctionGroupBitmapData.h

@@ -495,6 +495,48 @@ public:
         return count;
     }
 
+    UInt64 rb_min() const
+    {
+        UInt64 min_val = UINT32_MAX;
+        if (isSmall())
+        {
+            for (const auto & x : small)
+            {
+                T val = x.getValue();
+                if ((UInt64)val < min_val)
+                {
+                    min_val = (UInt64)val;
+                }
+            }
+        }
+        else
+        {
+            min_val = (UInt64)roaring_bitmap_minimum(rb);
+        }
+        return min_val;
+    }
+
+    UInt64 rb_max() const
+    {
+        UInt64 max_val = 0;
+        if (isSmall())
+        {
+            for (const auto & x : small)
+            {
+                T val = x.getValue();
+                if ((UInt64)val > max_val)
+                {
+                    max_val = (UInt64)val;
+                }
+            }
+        }
+        else
+        {
+            max_val = (UInt64)roaring_bitmap_maximum(rb);
+        }
+        return max_val;
+    }
+
 private:
     /// To read and write the DB Buffer directly, migrate code from CRoaring
     void db_roaring_bitmap_add_many(DB::ReadBuffer & dbBuf, roaring_bitmap_t * r, size_t n_args)

dbms/src/Functions/FunctionsBitmap.cpp

@@ -12,6 +12,8 @@ void registerFunctionsBitmap(FunctionFactory & factory)
     factory.registerFunction<FunctionBitmapSubsetInRange>();
 
     factory.registerFunction<FunctionBitmapSelfCardinality>();
+    factory.registerFunction<FunctionBitmapMin>();
+    factory.registerFunction<FunctionBitmapMax>();
     factory.registerFunction<FunctionBitmapAndCardinality>();
     factory.registerFunction<FunctionBitmapOrCardinality>();
     factory.registerFunction<FunctionBitmapXorCardinality>();

dbms/src/Functions/FunctionsBitmap.h

@@ -49,6 +49,12 @@ namespace ErrorCodes
   * Retrun bitmap cardinality:
   * bitmapCardinality:	bitmap -> integer
   *
+  * Retrun smallest value in the set:
+  * bitmapMin:	bitmap -> integer
+  *
+  * Retrun the greatest value in the set:
+  * bitmapMax:	bitmap -> integer
+  *
   * Two bitmap and calculation, return cardinality:
   * bitmapAndCardinality:	bitmap,bitmap -> integer
   *
@@ -357,13 +363,13 @@ private:
     }
 };
 
-template <typename Name>
+template <typename Impl>
 class FunctionBitmapSelfCardinalityImpl : public IFunction
 {
 public:
-    static constexpr auto name = Name::name;
+    static constexpr auto name = Impl::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapSelfCardinalityImpl>(); }
+    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapSelfCardinalityImpl<Impl>>(); }
 
     String getName() const override { return name; }
 
@@ -417,13 +423,46 @@ private:
             = typeid_cast<const ColumnAggregateFunction *>(block.getByPosition(arguments[0]).column.get());
         for (size_t i = 0; i < input_rows_count; ++i)
         {
-            const AggregateFunctionGroupBitmapData<T> & bd1
+            const AggregateFunctionGroupBitmapData<T> & bd
                 = *reinterpret_cast<const AggregateFunctionGroupBitmapData<T> *>(column->getData()[i]);
-            vec_to[i] = bd1.rbs.size();
+            vec_to[i] = Impl::apply(bd);
         }
     }
 };
 
+struct BitmapCardinalityImpl
+{
+public:
+    static constexpr auto name = "bitmapCardinality";
+    template <typename T>
+    static UInt64 apply(const AggregateFunctionGroupBitmapData<T> & bd)
+    {
+        return bd.rbs.size();
+    }
+};
+
+struct BitmapMinImpl
+{
+public:
+    static constexpr auto name = "bitmapMin";
+    template <typename T>
+    static UInt64 apply(const AggregateFunctionGroupBitmapData<T> & bd)
+    {
+        return bd.rbs.rb_min();
+    }
+};
+
+struct BitmapMaxImpl
+{
+public:
+    static constexpr auto name = "bitmapMax";
+    template <typename T>
+    static UInt64 apply(const AggregateFunctionGroupBitmapData<T> & bd)
+    {
+        return bd.rbs.rb_max();
+    }
+};
+
 template <typename T>
 struct BitmapAndCardinalityImpl
 {
@@ -840,7 +879,9 @@ struct NameBitmapHasAny
     static constexpr auto name = "bitmapHasAny";
 };
 
-using FunctionBitmapSelfCardinality = FunctionBitmapSelfCardinalityImpl<NameBitmapCardinality>;
+using FunctionBitmapSelfCardinality = FunctionBitmapSelfCardinalityImpl<BitmapCardinalityImpl>;
+using FunctionBitmapMin = FunctionBitmapSelfCardinalityImpl<BitmapMinImpl>;
+using FunctionBitmapMax = FunctionBitmapSelfCardinalityImpl<BitmapMaxImpl>;
 using FunctionBitmapAndCardinality = FunctionBitmapCardinality<BitmapAndCardinalityImpl, NameBitmapAndCardinality, UInt64>;
 using FunctionBitmapOrCardinality = FunctionBitmapCardinality<BitmapOrCardinalityImpl, NameBitmapOrCardinality, UInt64>;
 using FunctionBitmapXorCardinality = FunctionBitmapCardinality<BitmapXorCardinalityImpl, NameBitmapXorCardinality, UInt64>;

dbms/tests/queries/0_stateless/00829_bitmap_function.reference

@@ -67,3 +67,13 @@
 [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33]
 [30,31,32,33,100]
 [100]
+4294967295
+4294967295
+4294967295
+1
+0
+0
+0
+0
+9
+500

dbms/tests/queries/0_stateless/00829_bitmap_function.sql

@@ -211,3 +211,27 @@ select bitmapToArray(bitmapSubsetInRange(bitmapBuild([
 select bitmapToArray(bitmapSubsetInRange(bitmapBuild([
     0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,
     100,200,500]), toUInt32(100), toUInt32(200)));
+
+-- bitmapMin:
+---- Empty
+SELECT bitmapMin(bitmapBuild(emptyArrayUInt8()));
+SELECT bitmapMin(bitmapBuild(emptyArrayUInt16()));
+SELECT bitmapMin(bitmapBuild(emptyArrayUInt32()));
+---- Small
+select bitmapMin(bitmapBuild([1,5,7,9]));
+---- Large
+select bitmapMin(bitmapBuild([
+    0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,
+    100,200,500]));
+
+-- bitmapMax:
+---- Empty
+SELECT bitmapMax(bitmapBuild(emptyArrayUInt8()));
+SELECT bitmapMax(bitmapBuild(emptyArrayUInt16()));
+SELECT bitmapMax(bitmapBuild(emptyArrayUInt32()));
+---- Small
+select bitmapMax(bitmapBuild([1,5,7,9]));
+---- Large
+select bitmapMax(bitmapBuild([
+    0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,
+    100,200,500]));

docs/en/query_language/functions/bitmap_functions.md

@@ -292,6 +292,56 @@ SELECT bitmapCardinality(bitmapBuild([1, 2, 3, 4, 5])) AS res
 └─────┘
 ```
 
+## bitmapMin
+
+Retrun smallest value of type UInt64 in the set, UINT32_MAX if the set is empty.
+
+
+```
+bitmapMin(bitmap)
+```
+
+**Parameters**
+
+- `bitmap` – bitmap object.
+
+**Example**
+
+``` sql
+SELECT bitmapMin(bitmapBuild([1, 2, 3, 4, 5])) AS res
+```
+
+```
+┌─res─┐
+│   1 │
+└─────┘
+```
+
+## bitmapMax
+
+Retrun smallest value of type UInt64 in the set, 0 if the set is empty.
+
+
+```
+bitmapMax(bitmap)
+```
+
+**Parameters**
+
+- `bitmap` – bitmap object.
+
+**Example**
+
+``` sql
+SELECT bitmapMax(bitmapBuild([1, 2, 3, 4, 5])) AS res
+```
+
+```
+┌─res─┐
+│   5 │
+└─────┘
+```
+
 ## bitmapAndCardinality
 
 Two bitmap and calculation, return cardinality of type UInt64.

docs/zh/query_language/functions/bitmap_functions.md

@@ -276,6 +276,54 @@ SELECT bitmapCardinality(bitmapBuild([1, 2, 3, 4, 5])) AS res
 └─────┘
 ```
 
+## bitmapMin
+
+返回一个UInt64类型的数值，表示位图中的最小值。如果位图为空则返回UINT32_MAX。
+
+```
+bitmapMin(bitmap)
+```
+
+**Parameters**
+
+- `bitmap` – 位图对象。
+
+**示例**
+
+``` sql
+SELECT bitmapMin(bitmapBuild([1, 2, 3, 4, 5])) AS res
+```
+
+```
+┌─res─┐
+│   1 │
+└─────┘
+```
+
+## bitmapMax
+
+返回一个UInt64类型的数值，表示位图中的最大值。如果位图为空则返回0。
+
+```
+bitmapMax(bitmap)
+```
+
+**Parameters**
+
+- `bitmap` – 位图对象。
+
+**示例**
+
+``` sql
+SELECT bitmapMax(bitmapBuild([1, 2, 3, 4, 5])) AS res
+```
+
+```
+┌─res─┐
+│   5 │
+└─────┘
+```
+
 ## bitmapAndCardinality
 
 为两个位图对象进行与操作，返回结果位图的基数。