[Maria-developers] MATCH returns -1

Hello Sergei, This script: DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a VARCHAR(30), b DOUBLE); INSERT INTO t1 values('aaaa bbbb cccc dddd', MATCH (a) AGAINST('bbbb' IN BOOLEAN MODE)); SELECT * FROM t1; returns: +---------------------+------+ | a | b | +---------------------+------+ | aaaa bbbb cccc dddd | -1 | +---------------------+------+ What does this -1 mean? Is this a bug? Thanks!