thisisnic commented on code in PR #34050:
URL: https://github.com/apache/arrow/pull/34050#discussion_r1099942179
##########
cpp/src/arrow/engine/substrait/expression_internal.cc:
##########
@@ -320,6 +320,30 @@ Result<compute::Expression> FromProto(const
substrait::Expression& expr,
return function_converter(substrait_call);
}
+ case substrait::Expression::kCast: {
+ const auto& cast_exp = expr.cast();
+ ARROW_ASSIGN_OR_RAISE(auto input,
+ FromProto(cast_exp.input(), ext_set,
conversion_options));
+
+ // need to convert from the Substrait type spec to the relevant Arrow
thing
+ // do we need a switch/case or can we just get code similar to the below
FromProto?
+ // the type should come from cast_expr.type()
+
+ // this will be a Result<std::pair<std::shared_ptr<DataType>
+ ARROW_ASSIGN_OR_RAISE(auto type,
+ FromProto(cast_exp.type(), ext_set,
conversion_options));
+
+ if(cast_exp.failure_behavior() ==
substrait::Expression_Cast_FailureBehavior::Expression_Cast_FailureBehavior_FAILURE_BEHAVIOR_THROW_EXCEPTION){
+ return compute::call("cast", std::move(input),
compute::CastOptions::Safe(type));
+ } else if(cast_exp.failure_behavior() ==
substrait::Expression_Cast_FailureBehavior::Expression_Cast_FailureBehavior_FAILURE_BEHAVIOR_RETURN_NULL){
+
+ // e.g. if unspecified
+ } else {
+ return compute::call("cast", std::move(input),
compute::CastOptions::Unsafe(type));
Review Comment:
Thanks for highlighting this, I can see that these are different things, so
I'll update this.
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