Update docs of fromUnixTimeStamp[InJodaSyntax]()

docs/en/sql-reference/functions/date-time-functions.md

@@ -2766,9 +2766,11 @@ Result:
 
 ## fromUnixTimestamp
 
-Function converts Unix timestamp to a calendar date and a time of a day. When there is only a single argument of [Integer](../../sql-reference/data-types/int-uint.md) type, it acts in the same way as [toDateTime](../../sql-reference/functions/type-conversion-functions.md#todatetime) and return [DateTime](../../sql-reference/data-types/datetime.md) type.
+This function converts a Unix timestamp to a calendar date and a time of a day. 
 
-fromUnixTimestamp uses MySQL datetime format style, refer to https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date-format.
+It can be called in two ways:
+
+When given a single argument of type [Integer](../../sql-reference/data-types/int-uint.md), it returns a value of type [DateTime](../../sql-reference/data-types/datetime.md), i.e. behaves like [toDateTime](../../sql-reference/functions/type-conversion-functions.md#todatetime).
 
 Alias: `FROM_UNIXTIME`.
 
@@ -2786,14 +2788,16 @@ Result:
 └──────────────────────────────┘
 ```
 
-When there are two or three arguments, the first an [Integer](../../sql-reference/data-types/int-uint.md), [Date](../../sql-reference/data-types/date.md), [Date32](../../sql-reference/data-types/date32.md), [DateTime](../../sql-reference/data-types/datetime.md) or [DateTime64](../../sql-reference/data-types/datetime64.md), the second a constant format string and the third an optional constant time zone string — it acts in the same way as [formatDateTime](#formatdatetime) and return [String](../../sql-reference/data-types/string.md#string) type.
+When given two or three arguments where the first argument is a value of type [Integer](../../sql-reference/data-types/int-uint.md), [Date](../../sql-reference/data-types/date.md), [Date32](../../sql-reference/data-types/date32.md), [DateTime](../../sql-reference/data-types/datetime.md) or [DateTime64](../../sql-reference/data-types/datetime64.md), the second argument is a constant format string and the third argument is an optional constant time zone string, the function returns a value of type [String](../../sql-reference/data-types/string.md#string), i.e. it behaves like [formatDateTime](#formatdatetime). In this case, [MySQL's datetime format style](https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date-format) is used.
 
-For example:
+**Example:**
 
 ```sql
 SELECT fromUnixTimestamp(1234334543, '%Y-%m-%d %R:%S') AS DateTime;
 ```
 
+Result:
+
 ```text
 ┌─DateTime────────────┐
 │ 2009-02-11 14:42:23 │
@@ -2806,19 +2810,20 @@ SELECT fromUnixTimestamp(1234334543, '%Y-%m-%d %R:%S') AS DateTime;
 
 ## fromUnixTimestampInJodaSyntax
 
-Similar to fromUnixTimestamp, except that it formats time in Joda style instead of MySQL style. Refer to https://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html.
+Same as [fromUnixTimestamp](#fromUnixTimestamp) but when called in the second way (two or three arguments), the formatting is performed using [Joda style](https://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html) instead of MySQL style.
 
 **Example:**
 
 ``` sql
-SELECT fromUnixTimestampInJodaSyntax(1669804872, 'yyyy-MM-dd HH:mm:ss', 'UTC');
+SELECT fromUnixTimestampInJodaSyntax(1234334543, 'yyyy-MM-dd HH:mm:ss', 'UTC') AS DateTime;
 ```
 
 Result:
+
 ```
-┌─fromUnixTimestampInJodaSyntax(1669804872, 'yyyy-MM-dd HH:mm:ss', 'UTC')────┐
-│ 2022-11-30 10:41:12                                                        │
-└────────────────────────────────────────────────────────────────────────────┘
+┌─DateTime────────────┐
+│ 2009-02-11 06:42:23 │
+└─────────────────────┘
 ```
 
 ## toModifiedJulianDay

docs/en/sql-reference/functions/type-conversion-functions.md

@@ -1840,9 +1840,9 @@ Converts an `Int64` to a `DateTime64` value with fixed sub-second precision and
 **Syntax**
 
 ``` sql
-fromUnixTimestamp64Milli(value [, timezone])
-fromUnixTimestamp64Micro(value [, timezone])
-fromUnixTimestamp64Nano(value [, timezone])
+fromUnixTimestamp64Milli(value[, timezone])
+fromUnixTimestamp64Micro(value[, timezone])
+fromUnixTimestamp64Nano(value[, timezone])
 ```
 
 **Arguments**

src/Functions/FunctionUnixTimestamp64.h

@@ -26,11 +26,13 @@ namespace ErrorCodes
 class FunctionToUnixTimestamp64 : public IFunction
 {
 private:
-    size_t target_scale;
+    const size_t target_scale;
     const char * name;
+
 public:
     FunctionToUnixTimestamp64(size_t target_scale_, const char * name_)
-        : target_scale(target_scale_), name(name_)
+        : target_scale(target_scale_)
+        , name(name_)
     {
     }
 
@@ -42,8 +44,10 @@ public:
 
     DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
     {
-        if (!isDateTime64(arguments[0].type))
-            throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The only argument for function {} must be DateTime64", name);
+        FunctionArgumentDescriptors args{
+            {"value", &isDateTime64<IDataType>, nullptr, "DateTime64"}
+        };
+        validateFunctionArgumentTypes(*this, arguments, args);
 
         return std::make_shared<DataTypeInt64>();
     }
@@ -98,9 +102,10 @@ public:
 class FunctionFromUnixTimestamp64 : public IFunction
 {
 private:
-    size_t target_scale;
+    const size_t target_scale;
     const char * name;
     const bool allow_nonconst_timezone_arguments;
+
 public:
     FunctionFromUnixTimestamp64(size_t target_scale_, const char * name_, ContextPtr context)
         : target_scale(target_scale_)

tests/queries/0_stateless/01277_toUnixTimestamp64.sql

@@ -1,15 +1,15 @@
 -- Error cases
-SELECT toUnixTimestamp64Milli();  -- {serverError 42}
-SELECT toUnixTimestamp64Micro();  -- {serverError 42}
-SELECT toUnixTimestamp64Nano();  -- {serverError 42}
+SELECT toUnixTimestamp64Milli();  -- {serverError NUMBER_OF_ARGUMENTS_DOESNT_MATCH}
+SELECT toUnixTimestamp64Micro();  -- {serverError NUMBER_OF_ARGUMENTS_DOESNT_MATCH}
+SELECT toUnixTimestamp64Nano();  -- {serverError NUMBER_OF_ARGUMENTS_DOESNT_MATCH}
 
-SELECT toUnixTimestamp64Milli('abc');  -- {serverError 43}
-SELECT toUnixTimestamp64Micro('abc');  -- {serverError 43}
-SELECT toUnixTimestamp64Nano('abc');  -- {serverError 43}
+SELECT toUnixTimestamp64Milli('abc');  -- {serverError ILLEGAL_TYPE_OF_ARGUMENT}
+SELECT toUnixTimestamp64Micro('abc');  -- {serverError ILLEGAL_TYPE_OF_ARGUMENT}
+SELECT toUnixTimestamp64Nano('abc');  -- {serverError ILLEGAL_TYPE_OF_ARGUMENT}
 
-SELECT toUnixTimestamp64Milli('abc', 123);  -- {serverError 42}
-SELECT toUnixTimestamp64Micro('abc', 123);  -- {serverError 42}
-SELECT toUnixTimestamp64Nano('abc', 123);  -- {serverError 42}
+SELECT toUnixTimestamp64Milli('abc', 123);  -- {serverError NUMBER_OF_ARGUMENTS_DOESNT_MATCH}
+SELECT toUnixTimestamp64Micro('abc', 123);  -- {serverError NUMBER_OF_ARGUMENTS_DOESNT_MATCH}
+SELECT toUnixTimestamp64Nano('abc', 123);  -- {serverError NUMBER_OF_ARGUMENTS_DOESNT_MATCH}
 
 SELECT 'const column';
 WITH toDateTime64('2019-09-16 19:20:12.345678910', 3, 'Asia/Istanbul') AS dt64