[BUG-REPORT] `BinnerTime` object has not attribute `combine_expressions`

[thisismeleaving]

Description After upgrading from vaex v4.7.0 This call:

import vaex
from numpy import datetime64

vx = vaex.from_dict({
    'dt' : [
        datetime64('2016-12-01T10:00:00'),
        datetime64('2016-12-01T11:00:00')
    ],
    'tmp_idx': [
        '111_223.5',
        '111_223.5'
    ]
})
grouped = vx.groupby(by=[vaex.BinnerTime.per_day(vx.dt), vx.tmp_idx])

Now throws the following error:

AttributeError: 'BinnerTime' object has not attribute 'combine_expressions'

Software information

• Vaex version (import vaex; vaex.__version__): 4.9.1
• Vaex was installed via: pip
• OS: Ubuntu

[thisismeleaving]

This is still an issue in v4.9.2

[thisismeleaving]

still an issue as of v4.11.1

[fllara]

I'm experiencing this issue with 4.12

[nelmondo]

I'm experiencing this issue with 4.14

[JovanVeljanoski]

We've look at this in some detail.. unfortunately it clashes with other features and it might not be fixable (at least not in the short term). @maartenbreddels can explain this better.

As a work-around, i would suggest casting the datatime column to string in the required format, and then do the groupby. Does this make sense? I know it is annoying..

[nelmondo]

We've look at this in some detail.. unfortunately it clashes with other features and it might not be fixable (at least not in the short term). @maartenbreddels can explain this better.

As a work-around, i would suggest casting the datatime column to string in the required format, and then do the groupby. Does this make sense? I know it is annoying..

I change the format from datetime to string, but I can't solve this issue??? please check this... (I'm using with 4.16.0)

[nelmondo]

When does it fix???