docs: add CSV format options for COPY command

docs/reference/sql/copy.md

@@ -21,6 +21,16 @@ The command starts with the keyword `COPY`, followed by the name of the table yo
 `TO` specifies the file path and name to save the exported
 data (`/xxx/xxx/output.parquet` in this case).
 
+For example, to export data to CSV with custom timestamp and date formats:
+
+```sql
+COPY tbl TO '/path/to/file.csv' WITH (
+  FORMAT = 'csv',
+  TIMESTAMP_FORMAT = '%Y/%m/%d %H:%M:%S',
+  DATE_FORMAT = '%Y-%m-%d'
+);
+```
+
 #### `WITH` Option
 
 `WITH` adds options such as the file `FORMAT` which specifies the format of the exported file. In this example, the format is Parquet; it is a columnar storage format used for big data processing. Parquet efficiently compresses and encodes columnar data for big data analytics.
@@ -29,6 +39,9 @@ data (`/xxx/xxx/output.parquet` in this case).
 |---|---|---|
 | `FORMAT` | Target file(s) format, e.g., JSON, CSV, Parquet  | **Required** |
 | `START_TIME`/`END_TIME`| The time range within which data should be exported. `START_TIME` is inclusive and `END_TIME` is exclusive. | Optional |
+| `TIMESTAMP_FORMAT` | Custom format for timestamp columns when exporting to CSV format. Uses [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) format specifiers (e.g., `'%Y-%m-%d %H:%M:%S'`). Only supported for CSV format. | Optional |
+| `DATE_FORMAT` | Custom format for date columns when exporting to CSV format. Uses [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) format specifiers (e.g., `'%Y-%m-%d'`). Only supported for CSV format. | Optional |
+| `TIME_FORMAT` | Custom format for time columns when exporting to CSV format. Uses [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) format specifiers (e.g., `'%H:%M:%S'`). Only supported for CSV format. | Optional |
 
 #### `CONNECTION` Option
 
@@ -145,13 +158,26 @@ COPY (<QUERY>) TO '<PATH>' WITH (FORMAT = { 'CSV' | 'JSON' | 'PARQUET' });
 | `QUERY` | The SQL SELECT statement to execute | **Required** |
 | `PATH` | The file path where the output will be written | **Required** |
 | `FORMAT` | The output file format: 'CSV', 'JSON', or 'PARQUET' | **Required** |
+| `TIMESTAMP_FORMAT` | Custom format for timestamp columns when exporting to CSV format. Uses [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) format specifiers. Only supported for CSV format. | Optional |
+| `DATE_FORMAT` | Custom format for date columns when exporting to CSV format. Uses [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) format specifiers. Only supported for CSV format. | Optional |
+| `TIME_FORMAT` | Custom format for time columns when exporting to CSV format. Uses [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) format specifiers. Only supported for CSV format. | Optional |
 
 For example, the following statement exports query results to a CSV file:
 
 ```sql
 COPY (SELECT * FROM tbl WHERE host = 'host1') TO '/path/to/file.csv' WITH (FORMAT = 'csv');
 ```
 
+You can also specify custom date and time formats when exporting to CSV:
+
+```sql
+COPY (SELECT * FROM tbl WHERE host = 'host1') TO '/path/to/file.csv' WITH (
+  FORMAT = 'csv',
+  TIMESTAMP_FORMAT = '%m-%d-%Y %H:%M:%S',
+  DATE_FORMAT = '%Y/%m/%d'
+);
+```
+
 ## COPY DATABASE
 
 Beside copying specific table to/from some path, `COPY` statement can also be used to copy whole database to/from some path. The syntax for copying databases is:

i18n/zh/docusaurus-plugin-content-docs/current/reference/sql/copy.md

@@ -17,6 +17,16 @@ COPY tbl TO '/xxx/xxx/output.parquet' WITH (FORMAT = 'parquet');
 命令以 `COPY` 关键字开始，后面跟着要导出数据的表名（本例中为 `tbl`）。
 `TO` 指定导出数据的文件路径和名称（本例中为 `/xxx/xxx/output.parquet`）。
 
+例如，可以使用自定义时间戳和日期格式导出数据到 CSV 文件：
+
+```sql
+COPY tbl TO '/path/to/file.csv' WITH (
+  FORMAT = 'csv',
+  TIMESTAMP_FORMAT = '%Y/%m/%d %H:%M:%S',
+  DATE_FORMAT = '%Y-%m-%d'
+);
+```
+
 #### `WITH` 选项
 
 `WITH` 可以添加一些选项，比如文件的 `FORMAT` 用来指定导出文件的格式。本例中的格式为 Parquet，它是一种用于大数据处理的列式存储格式。Parquet 为大数据分析高效地压缩和编码列式数据。
@@ -25,6 +35,9 @@ COPY tbl TO '/xxx/xxx/output.parquet' WITH (FORMAT = 'parquet');
 |---|---|---|
 | `FORMAT` | 目标文件格式，例如 JSON, CSV, Parquet  | **是** |
 | `START_TIME`/`END_TIME`| 需要导出数据的时间范围，时间范围为左闭右开 | 可选 |
+| `TIMESTAMP_FORMAT` | 导出 CSV 格式时自定义时间戳列的格式。使用 [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) 格式说明符（例如 `'%Y-%m-%d %H:%M:%S'`）。仅支持 CSV 格式。 | 可选 |
+| `DATE_FORMAT` | 导出 CSV 格式时自定义日期列的格式。使用 [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) 格式说明符（例如 `'%Y-%m-%d'`）。仅支持 CSV 格式。 | 可选 |
+| `TIME_FORMAT` | 导出 CSV 格式时自定义时间列的格式。使用 [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) 格式说明符（例如 `'%H:%M:%S'`）。仅支持 CSV 格式。 | 可选 |
 
 #### `CONNECTION` 选项
 
@@ -138,13 +151,26 @@ COPY (<QUERY>) TO '<PATH>' WITH (FORMAT = { 'CSV' | 'JSON' | 'PARQUET' });
 | `QUERY` | 要执行的 SQL SELECT 语句 | **是** |
 | `PATH` | 输出文件的路径 | **是** |
 | `FORMAT` | 输出文件格式：'CSV'、'JSON' 或 'PARQUET' | **是** |
+| `TIMESTAMP_FORMAT` | 导出 CSV 格式时自定义时间戳列的格式。使用 [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) 格式说明符。仅支持 CSV 格式。 | 可选 |
+| `DATE_FORMAT` | 导出 CSV 格式时自定义日期列的格式。使用 [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) 格式说明符。仅支持 CSV 格式。 | 可选 |
+| `TIME_FORMAT` | 导出 CSV 格式时自定义时间列的格式。使用 [strftime](https://docs.rs/chrono/latest/chrono/format/strftime/index.html) 格式说明符。仅支持 CSV 格式。 | 可选 |
 
 例如，以下语句将查询结果导出到 CSV 文件中：
 
 ```sql
 COPY (SELECT * FROM tbl WHERE host = 'host1') TO '/path/to/file.csv' WITH (FORMAT = 'csv');
 ```
 
+也可以在导出到 CSV 时指定自定义日期和时间格式：
+
+```sql
+COPY (SELECT * FROM tbl WHERE host = 'host1') TO '/path/to/file.csv' WITH (
+  FORMAT = 'csv',
+  TIMESTAMP_FORMAT = '%m-%d-%Y %H:%M:%S',
+  DATE_FORMAT = '%Y/%m/%d'
+);
+```
+
 ## COPY DATABASE
 
 `COPY` 语句除可以导入/导出表之外，也可以导入/导出指定的数据库，其语法如下：