Dennis Gove created SOLR-7377:
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Summary: 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
It would be beneficial to add an expression-based interface to Streaming API
described in SOLR-6526. 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"),
over="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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