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                "content": "```json\n{\n  \"table_name\": \"national_brand_sales\",\n  \"description\": \"全国品牌系统外销售数据\",\n  \"columns\": [\n    {\n      \"original_name\": \"品牌\",\n      \"standard_name\": \"brand\",\n      \"data_type\": \"string\",\n      \"db_type\": \"varchar(50)\",\n      \"java_type\": \"string\",\n      \"nullable\": true,\n      \"distinct_count_sample\": 5,\n      \"null_ratio_sample\": 0.4,\n      \"is_enum_candidate\": false,\n      \"description\": \"品牌名称\",\n      \"date_format\": null\n    },\n    {\n      \"original_name\": \"产品价类\",\n      \"standard_name\": \"price_category\",\n      \"data_type\": \"string\",\n      \"db_type\": \"varchar(10)\",\n      \"java_type\": \"string\",\n      \"nullable\": false,\n      \"distinct_count_sample\": 3,\n      \"null_ratio_sample\": 0.0,\n      \"is_enum_candidate\": true,\n      \"description\": \"产品价格分类（一类/二类/三类）\",\n      \"date_format\": null\n    },\n    {\n      \"original_name\": \"是否重点品牌"
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                    "content": "```json\n{\n  \"table_name\": \"national_brand_sales\",\n  \"description\": \"全国品牌系统外销售数据\",\n  \"columns\": [\n    {\n      \"original_name\": \"品牌\",\n      \"standard_name\": \"brand\",\n      \"data_type\": \"string\",\n      \"db_type\": \"varchar(50)\",\n      \"java_type\": \"string\",\n      \"nullable\": true,\n      \"distinct_count_sample\": 5,\n      \"null_ratio_sample\": 0.4,\n      \"is_enum_candidate\": false,\n      \"description\": \"品牌名称\",\n      \"date_format\": null\n    },\n    {\n      \"original_name\": \"产品价类\",\n      \"standard_name\": \"price_category\",\n      \"data_type\": \"string\",\n      \"db_type\": \"varchar(10)\",\n      \"java_type\": \"string\",\n      \"nullable\": false,\n      \"distinct_count_sample\": 3,\n      \"null_ratio_sample\": 0.0,\n      \"is_enum_candidate\": true,\n      \"description\": \"产品价格分类（一类/二类/三类）\",\n      \"date_format\": null\n    },\n    {\n      \"original_name\": \"是否重点品牌"
                },
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