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searchenginetracker: Optimize direct/recursive folder lookups
tracker:uri-is-descendant/parent has the unfortunate side effect of rendering the collation mechanisms in the database useless, so those require full table scans to be validated. Performing these as pure string comparisons will perform much better, as those allow the underlying sqlite to rely on its own collation to perform the search, which can be significantly faster with many elements in the database. https://bugzilla.gnome.org/show_bug.cgi?id=758407
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@ -227,7 +227,8 @@ sparql_escape_string (const gchar *literal)
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static void
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sparql_append_string_literal (GString *sparql,
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const gchar *str,
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gboolean glob)
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gboolean glob,
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gboolean is_dir_uri)
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{
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gchar *s;
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@ -236,6 +237,8 @@ sparql_append_string_literal (GString *sparql,
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g_string_append_c (sparql, '"');
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g_string_append (sparql, s);
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if (is_dir_uri)
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g_string_append_c (sparql, '/');
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if (glob)
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g_string_append_c (sparql, '*');
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g_string_append_c (sparql, '"');
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@ -250,7 +253,7 @@ sparql_append_string_literal_lower_case (GString *sparql,
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gchar *s;
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s = g_utf8_strdown (str, -1);
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sparql_append_string_literal (sparql, s, FALSE);
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sparql_append_string_literal (sparql, s, FALSE, FALSE);
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g_free (s);
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}
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@ -347,11 +350,12 @@ gtk_search_engine_tracker_start (GtkSearchEngine *engine)
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"WHERE {"
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" ?urn a nfo:FileDataObject ;"
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" tracker:available true ; ");
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" nfo:belongsToContainer ?parent; ");
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#ifdef FTS_MATCHING
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/* Using FTS: */
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g_string_append (sparql, "fts:match ");
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sparql_append_string_literal (sparql, search_text, TRUE);
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sparql_append_string_literal (sparql, search_text, TRUE, FALSE);
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#endif
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g_string_append (sparql, ". FILTER (BOUND(nie:url(?urn)) && ");
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@ -365,11 +369,16 @@ gtk_search_engine_tracker_start (GtkSearchEngine *engine)
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gchar *location_uri = g_file_get_uri (location);
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g_string_append (sparql, " && ");
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if (recursive)
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g_string_append (sparql, "tracker:uri-is-descendant(");
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{
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g_string_append (sparql, "fn:starts-with(nie:url(?urn),");
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sparql_append_string_literal (sparql, location_uri, FALSE, TRUE);
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g_string_append (sparql, ")");
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}
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else
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g_string_append (sparql, "tracker:uri-is-parent(");
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sparql_append_string_literal (sparql, location_uri, FALSE);
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g_string_append (sparql, ",nie:url(?urn))");
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{
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g_string_append (sparql, "nie:url(?parent) = ");
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sparql_append_string_literal (sparql, location_uri, FALSE, FALSE);
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}
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g_free (location_uri);
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}
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