first_value and last_value

src/AggregateFunctions/AggregateFunctionAny.cpp

@@ -34,6 +34,14 @@ void registerAggregateFunctionsAny(AggregateFunctionFactory & factory)
     factory.registerFunction("any", { createAggregateFunctionAny, properties });
     factory.registerFunction("anyLast", { createAggregateFunctionAnyLast, properties });
     factory.registerFunction("anyHeavy", { createAggregateFunctionAnyHeavy, properties });
+
+    // Synonyms for use as window functions.
+    factory.registerFunction("first_value",
+        { createAggregateFunctionAny, properties },
+        AggregateFunctionFactory::CaseInsensitive);
+    factory.registerFunction("last_value",
+        { createAggregateFunctionAnyLast, properties },
+        AggregateFunctionFactory::CaseInsensitive);
 }
 
 }

src/Processors/Transforms/WindowTransform.cpp

@@ -1367,7 +1367,7 @@ struct WindowFunctionLagLead final : public WindowFunction
         // or track a separate frame for these functions, which would  make the
         // window transform completely impenetrable to human mind. Our best bet
         // is probably rewriting, say, `lag(value, offset)` to
-        // `any(value) over rows between offset preceding and offset preceding`,
+        // `any(value) over (rows between offset preceding and offset preceding)`,
         // at the query planning stage. We can keep this class as a stub for
         // parsing, anyway.
         throw Exception(ErrorCodes::NOT_IMPLEMENTED,

tests/queries/0_stateless/01591_window_functions.reference

@@ -968,3 +968,21 @@ select
     lead(2)(number) over (),
     lag(number) over ()
 from numbers(2); -- { serverError 48 }
+select
+    number,
+    fIrSt_VaLue(number) over w,
+    lAsT_vAlUe(number) over w
+from numbers(10)
+window w as (order by number range between 1 preceding and 1 following)
+order by number
+;
+0	0	1
+1	0	2
+2	1	3
+3	2	4
+4	3	5
+5	4	6
+6	5	7
+7	6	8
+8	7	9
+9	8	9

tests/queries/0_stateless/01591_window_functions.sql

@@ -334,3 +334,12 @@ select
     lead(2)(number) over (),
     lag(number) over ()
 from numbers(2); -- { serverError 48 }
+
+select
+    number,
+    fIrSt_VaLue(number) over w,
+    lAsT_vAlUe(number) over w
+from numbers(10)
+window w as (order by number range between 1 preceding and 1 following)
+order by number
+;