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https://issues.apache.org/jira/browse/SOLR-16243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17551737#comment-17551737
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Joel Bernstein edited comment on SOLR-16243 at 6/9/22 1:58 AM:
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The current Implementor is really only designed to manage one query. With
joins we'll have two queries (left and right side of the join) so we'll have
outgrown the original design of the implementor. This ticket translates
directly from one DAG (calcite parse tree) to another DAG (Streaming
Expression) so we'll be able to handle the joins.
was (Author: joel.bernstein):
The current implementor is really only designed to manage one query. With
joins we'll have two queries (left and right side of the join) so we'll have
outgrown the original design of the implementor. This ticket translates
directly from one DAG (calcite parse tree) to another DAG (Streaming
Expression) so we'll be able to handle the joins.
> Compile SQL to a Streaming Expression while visiting the Calcite SQL parse
> tree
> -------------------------------------------------------------------------------
>
> Key: SOLR-16243
> URL: https://issues.apache.org/jira/browse/SOLR-16243
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Parallel SQL
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Major
> Labels: RobustSQL
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently Solr SQL visits the SQL parse tree and builds up a set of
> properties that are passed to the SolrTable which creates the Streaming
> Expression object tree. This technique only works because we're not dealing
> yet with joins. It won't be practical to express joins using the current
> approach. In order to support joins we'll need to build the Streaming
> Expression as we visit the parse tree and pass the expression directly to the
> SolrTable.
> This ticket will only implement existing SQL support using the direct
> compilation approach.
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