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# # Inserts some rules, tests them and then inserts another one. # use test; CREATE TABLE t1 ( c1 VARCHAR(10), c2 VARCHAR(10) ); INSERT INTO t1 VALUES ( 'abc', 'def' ), ( 'ghi', 'klm' ), ( 'nop', 'qrs' ); CREATE TABLE t2 ( c1 VARCHAR(10) ); INSERT INTO t2 VALUES ( 'abc' ), ( 'klm' ); Warnings: Warning 1681 'RESET QUERY CACHE' is deprecated and will be removed in a future release. Warnings: Warning 1681 'RESET QUERY CACHE' is deprecated and will be removed in a future release. # Query rewrite plugin was installed. INSERT INTO query_rewrite.rewrite_rules ( pattern, replacement ) VALUES ( 'SELECT * FROM test.t1 WHERE ( c1 = ? AND TRUE ) OR c2 = ?', 'SELECT c1 FROM test.t1 WHERE c1 = ?' ), ( 'SELECT * FROM test.t2', 'SELECT * FROM test.t1 JOIN test.t2 ON test.t1.c1 = t2.c1' ); CALL query_rewrite.flush_rewrite_rules(); Warnings: Warning 1681 'RESET QUERY CACHE' is deprecated and will be removed in a future release. SHOW STATUS LIKE 'Rewriter_number_loaded_rules'; Variable_name Value Rewriter_number_loaded_rules 2 SHOW STATUS LIKE 'Rewriter_number_reloads'; Variable_name Value Rewriter_number_reloads 2 SELECT c2 FROM test.t1; c2 def klm qrs # Check that a rewrite works. SELECT * FROM test.t2; c1 c2 c1 abc def abc Warnings: Note 1105 Query 'SELECT * FROM test.t2' rewritten to 'SELECT * FROM test.t1 JOIN test.t2 ON test.t1.c1 = t2.c1' by a query rewrite plugin INSERT INTO query_rewrite.rewrite_rules ( pattern, replacement ) VALUES ( 'SELECT c2 FROM test.t1', 'SELECT * FROM test.t1' ); CALL query_rewrite.flush_rewrite_rules(); SHOW STATUS LIKE 'Rewriter_number_loaded_rules'; Variable_name Value Rewriter_number_loaded_rules 3 SHOW STATUS LIKE 'Rewriter_number_reloads'; Variable_name Value Rewriter_number_reloads 3 SET @@global.rewriter_verbose = 2; # Check that the new rule works. SELECT c2 FROM test.t1; c1 c2 abc def ghi klm nop qrs Warnings: Note 1105 Query 'SELECT c2 FROM test.t1' rewritten to 'SELECT * FROM test.t1' by a query rewrite plugin # Check that the old rewrites still work. SELECT * FROM test.t2; c1 c2 c1 abc def abc Warnings: Note 1105 Query 'SELECT * FROM test.t2' rewritten to 'SELECT * FROM test.t1 JOIN test.t2 ON test.t1.c1 = t2.c1' by a query rewrite plugin DROP TABLE t1, t2; Warnings: Warning 1620 Plugin is busy and will be uninstalled on shutdown # Query rewrite plugin was queued for uninstalling.