Ben Kietzman created ARROW-12632:
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Summary: [C++][Dataset][Compute] Add support for dictionary_encode
to Expression
Key: ARROW-12632
URL: https://issues.apache.org/jira/browse/ARROW-12632
Project: Apache Arrow
Issue Type: New Feature
Components: C++
Affects Versions: 4.0.0
Reporter: Ben Kietzman
Assignee: Ben Kietzman
Fix For: 5.0.0
dictionary_encode should be usable in the context of ExecuteScalarExpression,
but is not currently supported because it requires mutable state (the hash
table). Currently scanning assumes that Expression state will not be mutated so
only one instance is initialized and is shared between all threads of
execution. Supporting dictionary_encode will require adding support for
multiple states to Expression and usage of that by dataset scans.
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