Generalizer: Do not run ANALYZE in append mode

Running ANALYZE excessively can lead to the autovacuum daemon canceling
vacuum runs. If we don't run ANALYZE all the time, the autovacuum daemon
will do it for us when needed.

Author: joto

src/gen/gen-discrete-isolation.cpp

@@ -143,7 +143,9 @@ FROM {src} WHERE {importance_column} > 0
     connection().exec("COMMIT");
     timer(m_timer_write).stop();
 
-    dbexec("ANALYZE {src}");
+    if (!append_mode()) {
+        dbexec("ANALYZE {src}");
+    }
 
     log_gen("Done.");
 }

src/gen/gen-rivers.cpp

@@ -197,7 +197,11 @@ void gen_rivers_t::process()
     dbexec(R"(UPDATE {qualified_src_areas} SET width =)"
            R"( (ST_MaximumInscribedCircle("{geom_column}")).radius * 2)"
            R"( WHERE width IS NULL)");
-    dbexec("ANALYZE {qualified_src_areas}");
+
+    if (!append_mode()) {
+        dbexec("ANALYZE {qualified_src_areas}");
+    }
+
     timer(m_timer_area).stop();
 
     log_gen("Get 'width' from areas onto lines...");
@@ -343,7 +347,9 @@ SELECT "{id_column}", "{width_column}", "{name_column}", "{geom_column}"
     connection().exec("COMMIT");
     timer(m_timer_write).stop();
 
-    dbexec("ANALYZE {dest}");
+    if (!append_mode()) {
+        dbexec("ANALYZE {dest}");
+    }
 
     log_gen("Done.");
 }

src/gen/gen-tile-builtup.cpp

@@ -279,5 +279,8 @@ void gen_tile_builtup_t::post()
             }
         }
     }
-    dbexec("ANALYZE {dest}");
+
+    if (!append_mode()) {
+        dbexec("ANALYZE {dest}");
+    }
 }

src/gen/gen-tile-raster.cpp

@@ -256,5 +256,8 @@ void gen_tile_raster_union_t::post()
                 fmt::format("{}_{}", m_image_table, variant));
         }
     }
-    dbexec("ANALYZE {dest}");
+
+    if (!append_mode()) {
+        dbexec("ANALYZE {dest}");
+    }
 }

src/gen/gen-tile-vector.cpp

@@ -96,4 +96,9 @@ void gen_tile_vector_union_t::process(tile_t const &tile)
     log_gen("Inserted {} generalized polygons", result.affected_rows());
 }
 
-void gen_tile_vector_union_t::post() { dbexec("ANALYZE {dest}"); }
+void gen_tile_vector_union_t::post()
+{
+    if (!append_mode()) {
+        dbexec("ANALYZE {dest}");
+    }
+}