[enhance](hive) Add regression-test cases for hive text ddl and hive text insert and fix reading null string bug #42200 #42272
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…text insert and fix reading null string bug (apache#42200) ## Proposed changes Add regression-test cases for hive text table properties: | **Property** | **Description** | **Example Value** | **Supported in Doris** | |------------------------------|---------------------------------------------------------------------|-------------------|----------------------| | `field.delim` | Defines the delimiter between columns in each row. | `\1` | Yes | | `collection.delim` | Defines the delimiter for items in an array (collection type). | `\2` | Yes | | `mapkey.delim` | Defines the delimiter between keys and values in a map. | `\3` | Yes | | `serialization.null.format` | Defines how `NULL` values are represented in the text file. | `\\N` | Yes | | `escape.delim` | Specifies the escape character used for escaping special characters.| `\\` | Yes | | `line.delim` | Defines the delimiter between rows or lines in the file. | `\n` | Yes | ### Explanation: - **`field.delim`**: This property is used to specify how columns are separated in a row. For example, `\1` indicates the delimiter is a non-printable character. - **`collection.delim`**: Used to define how elements in an array or collection are separated. In this case, `\2` is used as a separator. - **`mapkey.delim`**: This property defines how keys and values in a map are separated. For instance, `\3` is used to separate map keys and values. - **`serialization.null.format`**: This setting specifies the format for `NULL` values in the data. `\\N` is commonly used to represent `NULL`. - **`escape.delim`**: Defines the escape character used in the text file for escaping special characters, such as the delimiter itself. Here, `\\` is used as the escape character. - **`line.delim`**: This property is used to specify the delimiter between lines or rows. Typically, `\n` (newline) is used as the line delimiter. **Note**: Unlike the other delimiters, `line.delim` is not escaped. If the content in the table contains the same character as the line delimiter, it may cause query errors. However, the other delimiters (`field.delim`, `collection.delim`, `mapkey.delim`) are escaped, so they will not cause issues.
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Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
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cherry pick from #42200