Are histograms implemented in the pandas backend?

[argenisleon]

Hi,

I am trying to calculate a column histogram like;

import pandas as pd
a=ibis.pandas.connect({"table": pd.DataFrame({"column_a": [1, 2, 3]})})
table = a.table("table")
table["column_a"].histogram(nbins=10).execute()

but I get
NotImplementedError: Could not find signature for execute_node: <Histogram, Series, int, NoneType, NoneType, NoneType>

I tried with some param combinations without success. Any help?

[ogrisel]

I think the error is pretty explicit: this feature does not exist for this backend (yet).

If you use a recent enough version of ibis, you can use the duckdb backend on your Pandas dataframe via the ibis.memtable function:

import ibis
import pandas as pd
table = ibis.memtable(pd.DataFrame({"a": range(100)}))
table["a"].histogram(nbins=10).execute()