# ersatz-table-valued-functions
[](https://pypi.org/project/ersatz-table-valued-functions/)
[](https://github.com/cldellow/ersatz-table-valued-functions/releases)
[](https://github.com/cldellow/ersatz-table-valued-functions/blob/main/LICENSE)
A bad idea.
**ersatz** *(adj.)*: made or used as a substitute, typically an inferior one, for something else.
## Installation
Install this library using `pip`:
pip install ersatz-table-valued-functions
## Usage
This library lets you rewrite queries like:
```sql
SELECT root, square FROM tbl_squares(3)
```
into queries like:
```sql
WITH _ersatz_1 AS (
SELECT
JSON_EXTRACT(value, '$[0]') AS "root",
JSON_EXTRACT(value, '$[1]') AS "square"
FROM JSON_EACH((SELECT tbl_squares(3)))
)
SELECT root, square FROM _ersatz_1
```
That is: it translates a query that _looks_ like it needs a table-valued function
into one that uses a scalar-valued function that returns a JSON 2D array.
To use it:
```python
from ersatz_table_valued_functions import rewrite
rewrite('SELECT root, square FROM tbl_squares(3)', { 'TBL_SQUARES': ['root', 'square'] })
```
## Development
To contribute to this library, first checkout the code. Then create a new virtual environment:
cd ersatz-table-valued-functions
python -m venv venv
source venv/bin/activate
Now install the dependencies and test dependencies:
pip install -e '.[test]'
To run the tests:
pytest
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