liukun4515 commented on code in PR #4149:
URL: https://github.com/apache/arrow-datafusion/pull/4149#discussion_r1021063144
##########
datafusion/optimizer/src/unwrap_cast_in_comparison.rs:
##########
@@ -292,6 +296,25 @@ fn is_support_data_type(data_type: &DataType) -> bool {
)
}
+fn is_decimal_type(dt: &DataType) -> bool {
+ matches!(dt, DataType::Decimal128(_, _))
+}
+
+fn is_unsigned_type(dt: &DataType) -> bool {
+ matches!(
+ dt,
+ DataType::UInt8 | DataType::UInt16 | DataType::UInt32 |
DataType::UInt64
+ )
+}
+
+/// Until https://github.com/apache/arrow-rs/issues/1043 is done
+/// (support for unsigned <--> decimal casts) we also don't do that
+/// kind of cast in this optimizer
+fn is_unsupported_cast(dt1: &DataType, dt2: &DataType) -> bool {
Review Comment:
Casting for `unsigned value <-> decimal ` is not supported now.
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