[SOLR-9442] Add json.nl=arrnvp (array of NamedValuePair) style in JSONResponseWriter

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 6.4, 7.0
• Component/s: Response Writers
• Assignee: Christine Poerschke
• Reporter: Jonny Marks
• Created: 26/Aug/16 13:12
• Updated: 08/May/17 16:10
• Resolved: 02/Nov/16 13:24

Description

The JSONResponseWriter class currently supports several styles of NamedList output format, documented on the wiki at http://wiki.apache.org/solr/SolJSON and in the code at https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/response/JSONResponseWriter.java#L71-L76.

For example the 'arrmap' style:

NamedList("a"=1,"b"=2,null=3) => [{"a":1},{"b":2},3]
NamedList("a"=1,"bar”=“foo",null=3.4f) => [{"a":1},{"bar”:”foo"},{3.4}]

This patch creates a new style ‘arrnvp’ which is an array of named value pairs. For example:

NamedList("a"=1,"b"=2,null=3) => [{"name":"a","int":1},{"name":"b","int":2},{"int":3}]
NamedList("a"=1,"bar”=“foo",null=3.4f) => [{"name":"a","int":1},{"name":"b","str":"foo"},{"float":3.4}]

This style maintains the type information of the values, similar to the xml format:

<lst name=“someField”>
      <int name=“a”>1</int>
      <str name=“bar”>foo</str>
      <float>3.4</float>
</lst>

Issue Links

• is related to: SOLR-10635 json "arrntv" format can sometime produce invalid json
• is related to: SOLR-9538 Relocate {JSON,Smile}WriterTest and TestBinaryResponseWriter to org.apache.solr.response
• is related to: SOLR-9551 Add constructor to JSONWriter which takes wrapperFunction and namedListStyle
• relates to: SOLR-9972 SpellCheckComponent to return collations and suggestions as a JSON object rather than a list
• relates to: SOLR-9787 Replace json.nl=arrnvp with json.nl=arrntv (array of Name Type Value) style in JSONResponseWriter

Sub-Tasks

• move http://wiki.apache.org/solr/SolJSON ('JSON specific parameters' +) to Solr Ref Guide: Resolved
• expand json.nl test+docs coverage w.r.t. NamedList(null=null): Resolved