Add back declaration

src/Columns/ColumnDecimal.cpp

@@ -46,6 +46,12 @@ int ColumnDecimal<T>::doCompareAt(size_t n, size_t m, const IColumn & rhs_, int)
     return decimalLess<T>(b, a, other.scale, scale) ? 1 : (decimalLess<T>(a, b, scale, other.scale) ? -1 : 0);
 }
 
+template <is_decimal T>
+Float64 ColumnDecimal<T>::getFloat64(size_t n) const
+{
+    return DecimalUtils::convertTo<Float64>(data[n], scale);
+}
+
 template <is_decimal T>
 const char * ColumnDecimal<T>::deserializeAndInsertFromArena(const char * pos)
 {

src/Columns/ColumnDecimal.h

@@ -97,6 +97,8 @@ public:
         return StringRef(reinterpret_cast<const char *>(&data[n]), sizeof(data[n]));
     }
 
+    Float64 getFloat64(size_t n) const final;
+
     const char * deserializeAndInsertFromArena(const char * pos) override;
     const char * skipSerializedInArena(const char * pos) const override;
     void updateHashWithValue(size_t n, SipHash & hash) const override;

src/Core/DecimalFunctions.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <Core/DecimalFunctions.h>
 #include <Core/Types.h>
 #include <Common/Exception.h>
 #include <Common/intExp.h>

src/Interpreters/RowRefs.cpp

@@ -1,10 +1,11 @@
 #include <Interpreters/RowRefs.h>
 
-#include <Common/RadixSort.h>
+#include <Columns/ColumnDecimal.h>
 #include <Columns/IColumn.h>
-#include <DataTypes/IDataType.h>
 #include <Core/Joins.h>
+#include <DataTypes/IDataType.h>
 #include <base/types.h>
+#include <Common/RadixSort.h>
 
 
 namespace DB

src/Interpreters/RowRefs.h

@@ -7,7 +7,6 @@
 #include <optional>
 #include <variant>
 
-#include <Columns/ColumnDecimal.h>
 #include <Columns/ColumnVector.h>
 #include <Columns/IColumn.h>
 #include <Core/Joins.h>