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`v` VARCHAR(10) COLLATE utf8_general_ci DEFAULT NULL,
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`c` VARCHAR(10) COLLATE utf8_general_ci DEFAULT NULL,
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`t` VARCHAR(50) COLLATE utf8_general_ci DEFAULT NULL,
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) ENGINE=MEMORY COLLATE = utf8_general_ci
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create temporary table t1 (v varchar(16383), key(v(10)));