liukun4515 commented on code in PR #4741:
URL: https://github.com/apache/arrow-datafusion/pull/4741#discussion_r1058266719
##########
datafusion/expr/src/type_coercion/binary.rs:
##########
@@ -575,6 +575,7 @@ fn temporal_coercion(lhs_type: &DataType, rhs_type:
&DataType) -> Option<DataTyp
},
(Timestamp(_, tz), Utf8) => Some(Timestamp(TimeUnit::Nanosecond,
tz.clone())),
(Utf8, Timestamp(_, tz)) => Some(Timestamp(TimeUnit::Nanosecond,
tz.clone())),
+ // TODO: need to investigate the result type for the comparison
between timestamp and date
Review Comment:
Yes
the result of comparison is bool type, but if left and right are the same
data type, we should get the common type for left and right through the `type
coercion`.
For example, INT32>INT64, the common type is INT64, and we should cast the
left to INT64.
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