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https://issues.apache.org/jira/browse/SOLR-7377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14503160#comment-14503160
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Dennis Gove edited comment on SOLR-7377 at 4/20/15 4:46 PM:
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Updated the patch based on some additional items I wanted to include in this.
Note that this patch adds a dependency on guava in the solr/solrj/ivy.xml file.
We may want to revisit this additional dependency. Guava is being used for some
basic string checks (to ensure operations only include supported characters)
and this logic could be coded up if we want to avoid added a dependency.
{code}
<dependency org="com.google.guava" name="guava"
rev="${/com.google.guava/guava}" conf="compile"/>
{code}
was (Author: dpgove):
Updated the patch based on some additional items I wanted to include in this.
Note that this patch adds a dependency on guava in the solr/solrj/ivy.xml file.
We may want to revisit this additional dependency. Guava is being used for some
basic string checks (to ensure operations only include supported characters)
and this logic could be coded up if we want to avoid added a dependency.
<dependency org="com.google.guava" name="guava"
rev="${/com.google.guava/guava}" conf="compile"/>
> 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
>
>
> 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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