[Geocoding] [OpenStreetMap] #4867: Searching with a postcode returns no results.

[OpenStreetMap]

#4867: Searching with a postcode returns no results.
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 Reporter:  stevie_    |      Owner:  geocoding@…
     Type:  defect     |     Status:  new
 Priority:  major      |  Milestone:
Component:  nominatim  |    Version:
 Keywords:  postcode   |
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 For example, querying the following Northern Irish address returns a
 single accurate result: "220 Ravenhill Avenue, Belfast".

 However, if I append the correct postcode to the query (either the full
 postcode or the first segment), no results are returned: "220 Ravenhill
 Avenue, Belfast, BT6 8LL" or "220 Ravenhill Avenue, Belfast, BT6"

 I have encountered similar behaviour for a number of NI addresses but have
 noted that this isn't always the case when searching, for example,
 addresses in London.

 After further digging, this appears to be due to there being no postal
 code information for NI.

 I believe the current behaviour to be incorrect. If the post code isn't
 one which is known, at very least, it should be omitted and results should
 be returned for the query sans post code.

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Ticket URL: <https://trac.openstreetmap.org/ticket/4867>
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