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A statement
ALTER TABLE t1 CHANGE COLUMN b x varchar(30)
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used to drop column's statistics in Engine-Independent Table Statistics.
In current 10.0-monty, the EITS entry is not dropped, which causes a failure in mysql-test/t/statistics.test which looks like this:
CURRENT_TEST: main.statistics
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mysqltest: At line 280: query 'LOAD DATA INFILE '$MYSQLTEST_VARDIR/tmp/save_column_stats'
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INTO TABLE mysql.column_stats
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FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n'' failed: 1062: Duplicate entry 'test-t1-b' for key 'PRIMARY'
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I guess, ALTER TABLE code merge went wrong somewhere.
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