[jira] [Updated] (ARROW-9555) Add inner (hash) equijoin physical plan

["Andy Grove (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-9555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Grove updated ARROW-9555:
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    Summary: Add inner (hash) equijoin physical plan  (was: Add inner (hash) join physical plan)

> Add inner (hash) equijoin physical plan
> ---------------------------------------
>
>                 Key: ARROW-9555
>                 URL: https://issues.apache.org/jira/browse/ARROW-9555
>             Project: Apache Arrow
>          Issue Type: Sub-task
>          Components: Rust - DataFusion
>            Reporter: Jorge Leitão
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Here is an overview of how I think we should implement support for equijoins, at least for the initial implementation.
>  * Read all batches from the left-side of the join into a single Vec<RecordBatch>
>  * Create a map something like HashMap<Vec<ScalarValue>, Vec<(usize,usize)>> to map keys to batch/row indices
>  * Iterate over this Vec<RecordBatch> and create an entry in a hash map, mapping the join keys to the index of the batch and row in the Vec<RecordBatch>
>  * For each input partition on the right-side of the join, return an output partition that is an iterator/stream that:
>  ** For each input row, evaluate the join keys
>  ** Look up those join keys in the hash map
>  ** If a match is found:
>  *** For each (batch, row) index create an output row which has the values from both the left and right row and emit it
>  ** If no match is found:
>  *** Do not emit a row



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