imay commented on a change in pull request #1600: Fix timediff can't support
time berfore 1970
URL: https://github.com/apache/incubator-doris/pull/1600#discussion_r311509614
##########
File path: be/src/exprs/timestamp_functions.cpp
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@@ -462,17 +462,18 @@ IntVal TimestampFunctions::to_days(
return IntVal(ts_value.daynr());
}
-// TODO(dhc): implement this funciton really
DoubleVal TimestampFunctions::time_diff(
FunctionContext* ctx, const DateTimeVal& ts_val1, const DateTimeVal&
ts_val2) {
if (ts_val1.is_null || ts_val2.is_null) {
return DoubleVal::null();
}
const DateTimeValue& ts_value1 = DateTimeValue::from_datetime_val(ts_val1);
const DateTimeValue& ts_value2 = DateTimeValue::from_datetime_val(ts_val2);
- int64_t timediff = ts_value1.unix_timestamp() - ts_value2.unix_timestamp();
- return DoubleVal(timediff);
+ int day_diff = ts_value1.daynr() - ts_value2.daynr();
Review comment:
Can you encapsulate a function return seconds since 0000-01-01 in
DateTimeValue?
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