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--disable_warnings
let $ENGINE=`select variable_value from performance_schema.global_variables where variable_name='DEFAULT_STORAGE_ENGINE'`;
--enable_warnings
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
SET NAMES cp932;
--character_set cp932
CREATE TABLE t1 (c1 INTEGER COMMENT '', c12 INTEGER, c13 DATETIME, c14 CHAR(10), PRIMARY KEY(c1), INDEX(c12,c13)) COMMENT='ACEGIJLNPRACEGIJLNPRACEGIJLNPRACEGIJLNPRACEGIJLNPRACEGIJLNPR';
SELECT table_comment,char_length(table_comment) FROM information_schema.tables WHERE table_name='t1';
SELECT column_comment,char_length(column_comment) FROM information_schema.columns WHERE table_name='t1' order by column_comment;
--replace_result $ENGINE ENGINE
SHOW CREATE TABLE t1;
ALTER TABLE t1 ADD COLUMN c2 INTEGER COMMENT 'A';
ALTER TABLE t1 ADD COLUMN c3 INTEGER COMMENT 'C';
ALTER TABLE t1 ADD COLUMN c4 INTEGER COMMENT 'E';
ALTER TABLE t1 ADD COLUMN c5 INTEGER COMMENT 'G';
SELECT table_comment,char_length(table_comment) FROM information_schema.tables WHERE table_name='t1';
SELECT column_comment,char_length(column_comment) FROM information_schema.columns WHERE table_name='t1' order by column_comment;
--replace_result $ENGINE ENGINE
SHOW CREATE TABLE t1;
ALTER TABLE t1 MODIFY COLUMN c3 CHAR(10);
SELECT table_comment,char_length(table_comment) FROM information_schema.tables WHERE table_name='t1';
SELECT column_comment,char_length(column_comment) FROM information_schema.columns WHERE table_name='t1' order by column_comment;
--replace_result $ENGINE ENGINE
SHOW CREATE TABLE t1;
ALTER TABLE t1 CHANGE COLUMN c4 c4_1 INTEGER COMMENT 'Ă';
SELECT table_comment,char_length(table_comment) FROM information_schema.tables WHERE table_name='t1';
SELECT column_comment,char_length(column_comment) FROM information_schema.columns WHERE table_name='t1' order by column_comment;
--replace_result $ENGINE ENGINE
SHOW CREATE TABLE t1;
ALTER TABLE t1 DROP COLUMN c2;
SELECT table_comment,char_length(table_comment) FROM information_schema.tables WHERE table_name='t1';
SELECT column_comment,char_length(column_comment) FROM information_schema.columns WHERE table_name='t1' order by column_comment;
--replace_result $ENGINE ENGINE
SHOW CREATE TABLE t1;
DROP TABLE t1;
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