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https://issues.apache.org/jira/browse/ARROW-8405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17082131#comment-17082131
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Pindikura Ravindra commented on ARROW-8405:
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gandiva doesn't support complex types yet.
# For output, the following will need to be fixed
**
[Allocating|https://github.com/apache/arrow/blob/master/cpp/src/gandiva/projector.cc#L172]
output vector for project
** populating output vector in
[codegen|https://github.com/apache/arrow/blob/master/cpp/src/gandiva/llvm_generator.cc#L368]
# For input, the following will need to be fixed
** loading entry from input vector in codegen. This is currently implemented
as a
[visitor|https://github.com/apache/arrow/blob/master/cpp/src/gandiva/expr_decomposer.cc#L42]
but the visitor only supports primitive types.
It will be easier to add support for primitive fields inside complex types to
begin with (eg. integer field inside a struct type).
> [Gandiva][UDF] Support complex datatype for UDF return type.
> ------------------------------------------------------------
>
> Key: ARROW-8405
> URL: https://issues.apache.org/jira/browse/ARROW-8405
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++ - Gandiva
> Reporter: ZMZ91
> Priority: Critical
>
> Is it possible to return a complex datatype for a UDF, like vector or event
> dictionary? Checked
> [https://github.com/apache/arrow/blob/master/cpp/src/gandiva/precompiled/types.h]
> and found the types used there are all basic datatypes.
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