Add prototype for rdf_fdw_table_clone function

This adds a prototype for the function rdf_fdw_table_clone, which
enables users to harvest all data (or a subset) from rdf_fdw foreign
tables. This function offers the possibility to extract data in small
chuncks to avoid large result sets from the target triplestore.

This patch also slightly changes the regression tests to a change in
the level of a FOREIGN TABLE logging option NOTICE > INFO.

expected/blazegraph-wikidata.out

@@ -37,7 +37,7 @@ SERVER wikidata OPTIONS (
 SELECT atmid, bankname, atmwkt
 FROM atms_munich
 WHERE bankname = 'BBBank';
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
   PREFIX lgdo: <http://linkedgeodata.org/ontology/>
@@ -98,7 +98,7 @@ SELECT wikidata_id, label, wkt
 FROM places_below_sea_level
 WHERE wikidata_id = 'http://www.wikidata.org/entity/Q61308849'
 FETCH FIRST 5 ROWS ONLY;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT (STR(?place) AS ?placeid) (UCASE(?label) AS ?labelc) ?location 
@@ -177,7 +177,7 @@ WHERE
   base_url = 'http://www.wikidata.org/entity/' AND
   ctlang = 'http://www.wikidata.org/entity/Q32LUXEMBURG'
 ORDER by language;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?label (STRLEN(?nativename) AS ?1len2) (LANG(?nativename) AS ?language) (STRBEFORE(STR(?country),"Q") AS ?b4se) (STRAFTER(STR(?country),"entity/") AS ?q1d) (CONCAT(STR(?country),UCASE(?nativename)) AS ?ct) ("2002-03-08"^^xsd:date AS ?det) ("2002-03-08T14:33:42"^^xsd:dateTime AS ?ts) (STRSTARTS(STR(?country),"http") AS ?but) (STRENDS(STR(?country),"http") AS ?buf) 
@@ -222,7 +222,7 @@ WHERE
   bf IS NOT true AND
   bt IS true AND
   bt IS NOT false;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename (STRSTARTS(STR(?country),"http") AS ?but) (STRENDS(STR(?country),"http") AS ?buf) 
@@ -250,7 +250,7 @@ WHERE
   NOT bf IS true AND
   bt IS true AND
   NOT bt IS false;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename (STRSTARTS(STR(?country),"http") AS ?but) (STRENDS(STR(?country),"http") AS ?buf) 
@@ -281,7 +281,7 @@ WHERE
   bf != true AND
   bt = true AND
   bt != false;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename (STRSTARTS(STR(?country),"http") AS ?but) (STRENDS(STR(?country),"http") AS ?buf) 
@@ -305,7 +305,7 @@ BEGIN
   ORDER BY nativename
   OFFSET 0 LIMIT 5;  
 END; $$;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename 
@@ -353,7 +353,7 @@ BEGIN
   END LOOP;
 
 END; $$;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename 
@@ -365,7 +365,7 @@ SELECT ?country ?nativename
 ORDER BY  ASC (?country)
 LIMIT 5
 
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename 
@@ -377,7 +377,7 @@ SELECT ?country ?nativename
 ORDER BY  ASC (?country)
 LIMIT 10
 
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename 
@@ -398,7 +398,7 @@ SELECT uri, nativename
   LIMIT 15
 )
 SELECT * FROM local EXCEPT SELECT * FROM j;
-NOTICE:  SPARQL query sent to 'https://query.wikidata.org/sparql':
+INFO:  SPARQL query sent to 'https://query.wikidata.org/sparql':
 
 
 SELECT ?country ?nativename 

expected/graphdb-getty.out

@@ -36,7 +36,7 @@ SELECT DISTINCT name, lon, lat
 FROM getty_places 
 ORDER BY lat
 LIMIT 10;
-NOTICE:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
+INFO:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
 
  PREFIX ontogeo: <http://www.ontotext.com/owlim/geo#>
  PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
@@ -74,7 +74,7 @@ SELECT uri, lon, lat
 FROM getty_places
 WHERE name = 'West Flanders, Flanders, Belgium, Europe, World'
 ORDER BY lon;
-NOTICE:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
+INFO:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
 
  PREFIX ontogeo: <http://www.ontotext.com/owlim/geo#>
  PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
@@ -178,7 +178,7 @@ SELECT * FROM (
   FROM getty_places
   WHERE lat BETWEEN 52.5 AND 53.0) j
 ORDER BY lat;
-NOTICE:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
+INFO:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
 
  PREFIX ontogeo: <http://www.ontotext.com/owlim/geo#>
  PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
@@ -258,7 +258,7 @@ FROM getty_non_italians
 WHERE bio ~~* '%artist%'
 ORDER BY birth 
 LIMIT 10;
-NOTICE:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
+INFO:  SPARQL query sent to 'http://vocab.getty.edu/sparql.xml':
 
 
   PREFIX ontogeo: <http://www.ontotext.com/owlim/geo#>