Christian Spitzlay created SOLR-12499:
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Summary: Add reduce operation to merge field values
Key: SOLR-12499
URL: https://issues.apache.org/jira/browse/SOLR-12499
Project: Solr
Issue Type: New Feature
Security Level: Public (Default Security Level. Issues are Public)
Components: streaming expressions
Affects Versions: 7.3.1
Reporter: Christian Spitzlay
It would be nice to have a reduce operation that lets you collect the values of
a field from the group of tuples into an array.
{code:java}
Something that transforms
{
"k1": "1",
"k2": ["a", "b"]
},
{
"k1": "2",
"k2": ["c", "d"]
},
{
"k1": "2",
"k2": ["e", "f"]
}
into
{
"k1": "1",
"k2": ["a", "b"]
},
{
"k1": "2",
"k2": ["c", "d", "e", "f"]
}
{code}
and
{code:java}
{
"k1": "1",
"k2": "a"
},
{
"k1": "2",
"k2": "b"
},
{
"k1": "2",
"k2": "c"
}
into
{
"k1": "1",
"k2": ["a"]
},
{
"k1": "2",
"k2": ["b", "c"]
}
{code}
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