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https://issues.apache.org/jira/browse/SOLR-7377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dennis Gove updated SOLR-7377:
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Attachment: SOLR-7377.patch
Updated patch with a few changes.
FieldComparator and StreamComparator have been collapsed into a single class
StreamComparator. There was no need for a separate abstract class.
Added null checks in StreamComparator. For now if both are null then they will
evaluate to equal. We can add a later enhancement under a new ticket to make
that configurable.
Interfaces ExpressibleStream and ExpressibleComparator have been collapsed into
interface Expressible. They defined the same interface and there's no reason to
have separate interfaces for them.
Passes precommit checks.
> SOLR Streaming Expressions
> --------------------------
>
> Key: SOLR-7377
> URL: https://issues.apache.org/jira/browse/SOLR-7377
> Project: Solr
> Issue Type: Improvement
> Components: clients - java
> Reporter: Dennis Gove
> Priority: Minor
> Fix For: Trunk
>
> Attachments: SOLR-7377.patch, SOLR-7377.patch, SOLR-7377.patch,
> SOLR-7377.patch, SOLR-7377.patch, SOLR-7377.patch, SOLR-7377.patch,
> SOLR-7377.patch, SOLR-7377.patch, SOLR-7377.patch, SOLR-7377.patch
>
>
> It would be beneficial to add an expression-based interface to Streaming API
> described in SOLR-7082. Right now that API requires streaming requests to
> come in from clients as serialized bytecode of the streaming classes. The
> suggestion here is to support string expressions which describe the streaming
> operations the client wishes to perform.
> {code:java}
> search(collection1, q=*:*, fl="id,fieldA,fieldB", sort="fieldA asc")
> {code}
> With this syntax in mind, one can now express arbitrarily complex stream
> queries with a single string.
> {code:java}
> // merge two distinct searches together on common fields
> merge(
> search(collection1, q="id:(0 3 4)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> search(collection2, q="id:(1 2)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> on="a_f asc, a_s asc")
> // find top 20 unique records of a search
> top(
> n=20,
> unique(
> search(collection1, q=*:*, fl="id,a_s,a_i,a_f", sort="a_f desc"),
> over="a_f desc"),
> sort="a_f desc")
> {code}
> The syntax would support
> 1. Configurable expression names (eg. via solrconfig.xml one can map "unique"
> to a class implementing a Unique stream class) This allows users to build
> their own streams and use as they wish.
> 2. Named parameters (of both simple and expression types)
> 3. Unnamed, type-matched parameters (to support requiring N streams as
> arguments to another stream)
> 4. Positional parameters
> The main goal here is to make streaming as accessible as possible and define
> a syntax for running complex queries across large distributed systems.
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