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https://issues.apache.org/jira/browse/ARROW-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ji Liu updated ARROW-5883:
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Description:
As described in
[http://arrow.apache.org/docs/format/Layout.html#dictionary-encoding], List
type encoding should be supported.
Now ListVector getObject returns a ArrayList implementation, and its equals and
hashCode are already overwritten, so it could be directly supported to be
hashMap key in DictionaryEncoder. Since we won't change Dictionary data during
encoding/decoding process, use mutable key seems dose't matter.
StructVector is similar with ListVector.
was:
As described in
[http://arrow.apache.org/docs/format/Layout.html#dictionary-encoding], List
type encoding should be supported.
Now ListVector getObject returns a ArrayList implementation, and its equals and
hashCode are already overwritten, so it could be directly supported to be
hashMap key in DictionaryEncoder. Since we won't change Dictionary data during
encoding/decoding process, use mutable key seems dose't matter.
> [Java] Support dictionary encoding for List and Struct type
> -----------------------------------------------------------
>
> Key: ARROW-5883
> URL: https://issues.apache.org/jira/browse/ARROW-5883
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Ji Liu
> Assignee: Ji Liu
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> As described in
> [http://arrow.apache.org/docs/format/Layout.html#dictionary-encoding], List
> type encoding should be supported.
> Now ListVector getObject returns a ArrayList implementation, and its equals
> and hashCode are already overwritten, so it could be directly supported to be
> hashMap key in DictionaryEncoder. Since we won't change Dictionary data
> during encoding/decoding process, use mutable key seems dose't matter.
> StructVector is similar with ListVector.
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