tdf#92538 pgsql-sdbc make a reasonable sorting of types

Change-Id: I74283234834b5057857620ed2466068e88628585

connectivity/source/drivers/postgresql/pq_databasemetadata.cxx

@@ -2142,12 +2142,85 @@ struct TypeInfoByDataTypeSorter
             OUString nameB;
             a[0 /*TYPE_NAME*/] >>= nameA;
             b[0 /*TYPE_NAME*/] >>= nameB;
-            if( nameA.startsWith( "int4" ) )
+            OUString nsA, tnA, nsB, tnB;
+
+            // parse typename into schema and typename
+            sal_Int32 nIndex=0;
+            nsA = nameA.getToken(0, '.', nIndex);
+            if (nIndex<0)
+            {
+                tnA = nsA;
+                nsA.clear();
+            }
+            else
+            {
+                tnA = nameA.getToken(0, '.', nIndex);
+                assert(nIndex < 0);
+            }
+
+            nIndex=0;
+            nsB = nameB.getToken(0, '.', nIndex);
+            if (nIndex<0)
+            {
+                tnB = nsB;
+                nsB.clear();
+            }
+            else
+            {
+                tnB = nameB.getToken(0, '.', nIndex);
+                assert(nIndex < 0);
+            }
+
+            // sort no schema first, then "public", then normal schemas, then internal schemas
+            if(nsA == nsB)
+            {
+                if(nsA.isEmpty())
+                {
+                    assert(nsB.isEmpty());
+                    // within each type category, sort privileged choice first
+                    if( tnA == "int4" || tnA == "varchar" || tnA == "char" || tnA == "text")
                         return true;
-            if( nameB.startsWith( "int4" ) )
+                    if( tnB == "int4" || tnB == "varchar" || tnB == "char" || tnB == "text")
                         return false;
+                }
                 return nameA.compareTo( nameB ) < 0;
             }
+            else if (nsA.isEmpty())
+            {
+                assert(!nsB.isEmpty());
+                return true;
+            }
+            else if (nsB.isEmpty())
+            {
+                assert(!nsA.isEmpty());
+                return false;
+            }
+            else if(nsA == "public")
+            {
+                assert(nsB != "public");
+                return true;
+            }
+            else if(nsB == "public")
+            {
+                assert(nsA != "public");
+                return false;
+            }
+            else if(nsA.startsWith("pg_"))
+            {
+                if(nsB.startsWith("pg_"))
+                    return nsA.compareTo(nsB) < 0;
+                else
+                    return false;
+            }
+            else if(nsB.startsWith("pg_"))
+            {
+                return true;
+            }
+            else
+            {
+                return nsA.compareTo(nsB) < 0;
+            }
+        }
 
         return valueA.toInt32() < valueB.toInt32();
 //         sal_Int32 valueA;