make the fulltext index for search more space-efficient

Alexei Sorokin created 4 years ago

It now uses the data from the messages table instead of having a copy of each
message.

The message UUIDs are no longer part of the index.

Change summary

src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java | 4 
1 file changed, 2 insertions(+), 2 deletions(-)

Detailed changes

src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java

@@ -170,10 +170,10 @@ public class DatabaseBackend extends SQLiteOpenHelper {
     private static final String CREATE_MESSAGE_RELATIVE_FILE_PATH_INDEX = "CREATE INDEX message_file_path_index ON " + Message.TABLENAME + "(" + Message.RELATIVE_FILE_PATH + ")";
     private static final String CREATE_MESSAGE_TYPE_INDEX = "CREATE INDEX message_type_index ON " + Message.TABLENAME + "(" + Message.TYPE + ")";
 
-    private static final String CREATE_MESSAGE_INDEX_TABLE = "CREATE VIRTUAL TABLE messages_index USING fts4 (uuid TEXT PRIMARY KEY, body TEXT, tokenize = 'unicode61')";
+    private static final String CREATE_MESSAGE_INDEX_TABLE = "CREATE VIRTUAL TABLE messages_index USING fts4 (uuid,body,notindexed=\"uuid\",content=\"" + Message.TABLENAME + "\",tokenize='unicode61')";
     private static final String CREATE_MESSAGE_INSERT_TRIGGER = "CREATE TRIGGER after_message_insert AFTER INSERT ON " + Message.TABLENAME + " BEGIN INSERT INTO messages_index (uuid,body) VALUES (new.uuid,new.body); END;";
     private static final String CREATE_MESSAGE_UPDATE_TRIGGER = "CREATE TRIGGER after_message_update UPDATE of uuid,body ON " + Message.TABLENAME + " BEGIN update messages_index set body=new.body,uuid=new.uuid WHERE uuid=old.uuid; END;";
-    private static final String COPY_PREEXISTING_ENTRIES = "INSERT INTO messages_index(uuid,body) SELECT uuid,body FROM " + Message.TABLENAME + ";";
+    private static final String COPY_PREEXISTING_ENTRIES = "INSERT INTO messages_index(messages_index) VALUES('rebuild');";
 
     private DatabaseBackend(Context context) {
         super(context, DATABASE_NAME, null, DATABASE_VERSION);