JackieTien97 opened a new pull request, #15977:
URL: https://github.com/apache/iotdb/pull/15977
This pull request introduces a new built-in scalar function, `to_base64`, to
the IoTDB query engine. The function allows encoding `STRING`, `TEXT`, and
`BLOB` data types to Base64 format. Key changes include the implementation of
the function, integration into the query engine, and comprehensive testing.
### Implementation of `to_base64`:
* **Function logic and transformation**:
- Added the `ToBase64ColumnTransformer` class to handle Base64 encoding
for supported data types (`STRING`, `TEXT`, `BLOB`) in unary column
transformations.
* **Integration into the query engine**:
- Updated `ColumnTransformerBuilder` to include logic for processing the
`to_base64` function and returning the appropriate column transformer.
- Modified `TableMetadataImpl` to validate the input arguments for
`to_base64` and ensure only one argument of a supported type is accepted.
- Added `TO_BASE64` to the `TableBuiltinScalarFunction` enumeration to
register the function.
### Testing and validation:
* **Unit tests for `ToBase64ColumnTransformer`**:
- Added extensive tests in `ToBase64ColumnTransformerTest` to verify
functionality for supported data types (`STRING`, `TEXT`, `BLOB`), handling of
null values, multi-row transformations, and selective evaluation.
* **Integration tests**:
- Created `IoTDBToBase64FunctionTableIT` to test the `to_base64` function
in query scenarios, including successful transformations and error handling for
unsupported types.
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