[chore](be) remove useless cast to string

Author: yiguolei

be/src/exec/olap_common.h

@@ -55,41 +55,6 @@
 namespace doris {
 #include "common/compile_check_begin.h"
 
-template <PrimitiveType primitive_type, class T>
-std::string cast_to_string(T value, int scale) {
-    if constexpr (primitive_type == TYPE_DECIMAL32) {
-        return ((vectorized::Decimal<int32_t>)value).to_string(scale);
-    } else if constexpr (primitive_type == TYPE_DECIMAL64) {
-        return ((vectorized::Decimal<int64_t>)value).to_string(scale);
-    } else if constexpr (primitive_type == TYPE_DECIMAL128I) {
-        return ((vectorized::Decimal<int128_t>)value).to_string(scale);
-    } else if constexpr (primitive_type == TYPE_DECIMAL256) {
-        return ((vectorized::Decimal<wide::Int256>)value).to_string(scale);
-    } else if constexpr (primitive_type == TYPE_TINYINT) {
-        return std::to_string(static_cast<int>(value));
-    } else if constexpr (primitive_type == TYPE_LARGEINT) {
-        return vectorized::int128_to_string(value);
-    } else if constexpr (primitive_type == TYPE_DATETIMEV2) {
-        auto datetimev2_val = static_cast<DateV2Value<DateTimeV2ValueType>>(value);
-        char buf[30];
-        datetimev2_val.to_string(buf);
-        std::stringstream ss;
-        ss << buf;
-        return ss.str();
-    } else if constexpr (primitive_type == TYPE_TIMESTAMPTZ) {
-        auto timestamptz_val = static_cast<TimestampTzValue>(value);
-        return timestamptz_val.to_string(cctz::utc_time_zone(), scale);
-    } else if constexpr (primitive_type == TYPE_TIMEV2) {
-        return TimeValue::to_string(value, scale);
-    } else if constexpr (primitive_type == TYPE_IPV4) {
-        return IPv4Value::to_string(value);
-    } else if constexpr (primitive_type == TYPE_IPV6) {
-        return IPv6Value::to_string(value);
-    } else {
-        return boost::lexical_cast<std::string>(value);
-    }
-}
-
 /**
  * @brief Column's value range
  **/