Matt Frantz created TINKERPOP3-675:
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Summary: select(local) applied to Element
Key: TINKERPOP3-675
URL: https://issues.apache.org/jira/browse/TINKERPOP3-675
Project: TinkerPop 3
Issue Type: Improvement
Components: process
Reporter: Matt Frantz
{{select(local)}} currently works on {{Map}}, but it could be interpreted as a
property value selector on {{Element}}. Sounds like [~okram] considered making
{{Element}} a {{Map}} implementation at one point, so it must not be a terrible
idea. This would give it approximately the semantics of {{valueMap}} with a
few exceptions because of {{select}}'s "collections only when necessary"
philosophy.
Scenario: Single property name with single cardinality emits single value.
{noformat}
gremlin> g = TinkerFactory.createModern().traversal()
gremlin> g.V().has('name', 'josh').select(local, 'age')
==>32
{noformat}
Scenario: Single property name with multi cardinality emits value as collection.
{noformat}
gremlin> g = TinkerFactory.createTheCrew().traversal()
gremlin> g.V().has('name', 'marko').select(local, 'location')
==>[san diego, santa cruz, brussels, santa fe]
{noformat}
Scenario: Multiple property names with single cardinality emits Map of single
values.
{noformat}
gremlin> g = TinkerFactory.createModern().traversal()
gremlin> g.V().has('age', gte(30)).select(local, 'name', 'age')
==>[name:josh, age:32]
==>[name:peter, age:35]
{noformat}
Scenario: Multiple property names with mixed cardinality emits Map of mixed
single and collection values.
{noformat}
gremlin> g = TinkerFactory.createTheCrew().traversal()
gremlin> g.V().has('location', gte('d')).select(local, 'name', 'location')
==>[name:marko, location:[san diego, santa cruz, brussels, santa fe]]
==>[name:stephen, location:[centreville, dulles, purcellville]]
==>[name:matthias, location:[bremen, baltimore, oakland, seattle]]
==>[name:daniel, location:[spremberg, kaiserslautern, aachen]]
{noformat}
Scenario: No property names emits a Map with all property values with mixed
single and collection values.
{noformat}
gremlin> g = TinkerFactory.createTheCrew().traversal()
gremlin> g.V().has('location', gte('d')).select(local)
==>[name:marko, location:[san diego, santa cruz, brussels, santa fe]]
==>[name:stephen, location:[centreville, dulles, purcellville]]
==>[name:matthias, location:[bremen, baltimore, oakland, seattle]]
==>[name:daniel, location:[spremberg, kaiserslautern, aachen]]
{noformat}
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