SET @crnp_row_map_column_exists := (
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SELECT COUNT(1)
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FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'asr_bas_crnp'
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AND COLUMN_NAME = 'row_map'
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);
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SET @add_crnp_row_map_sql := IF(@crnp_row_map_column_exists = 0,
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'ALTER TABLE `asr_bas_crnp` ADD COLUMN `row_map` varchar(1000) DEFAULT NULL COMMENT ''堆垛机命令排号映射JSON'' AFTER `deep_rows`',
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'SELECT 1'
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);
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PREPARE stmt_add_crnp_row_map FROM @add_crnp_row_map_sql;
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EXECUTE stmt_add_crnp_row_map;
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DEALLOCATE PREPARE stmt_add_crnp_row_map;
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