now() not working on bind_params

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Hi, I am trying to implement bind params on my DataFrameClient query.

The following code returns an error:

params = {"start": "1h",
"stop": "now()"}
query = """
SELECT * FROM alerts
WHERE
time >= $start - $end
GROUP BY
time(1m)
"""
data = client.query(query, bind_params=params)

Error is as follows:

influxdb.exceptions.InfluxDBClientError: invalid operation: time and *influxql.BinaryExpr are not compatible

If I replace "1h" and "now()" in params with timestamps then the code compiles fine, like so:

params = {"start": "2020-02-21",
"stop": "2020-02-22"}
query = """
SELECT * FROM alerts
WHERE
time >= $start - $end
GROUP BY
time(1m)
"""
data = client.query(query, bind_params=params)

Start at the DataFrameClient.query entry point and reproduce the reported bind_params query using "1h" and "now()". Trace how those parameters are handled and compare the failing expression with the timestamp-based case; done means the reported query no longer raises the time and BinaryExpr incompatibility error.

Written by the indexing model from the issue text.