[Fdo-trac] [fdo-trac] #973: PostgreSQL provider won't work on PostgresSQL >= 12.0

[FDO]

#973: PostgreSQL provider won't work on PostgresSQL >= 12.0
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   Reporter:  jng                  |      Owner:  jng
       Type:  defect               |     Status:  assigned
   Priority:  major                |  Milestone:  4.1.0
  Component:  PostgreSQL Provider  |    Version:
   Severity:  3                    |   Keywords:
External ID:                       |
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 The PostgreSQL provider makes reference to the column `pg_attrdef.adsrc`
 [https://trac.osgeo.org/fdo/browser/branches/4.1/Providers/GenericRdbms/Src/PostGis/SchemaMgr/Ph/Rd/ColumnReader.cpp#L205
 here].

 This column has been removed in PostgreSQL 12.0, rendering the provider
 un-usable for this version of PostgreSQL.

 The use of `d.adsrc` can be replaced with `pg_get_expr(d.adbin,
 d.adrelid)`.  For even more safety, do a PG version check to see whether
 we can use `adsrc` or its replacement.

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Ticket URL: <https://trac.osgeo.org/fdo/ticket/973>
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