[FEATURE-REQUEST] Vaex All Columns Dynamic Access Support

Description I wish to aggregate all columns to a single column in vaex.

Something like :

df["combined"] = ",".join(df[reduced_cols])

Is your feature request related to a problem? Please describe. There is no simple way to do this in vaex.

Additional context Can be done in pandas using axis of apply, something like

df["combined"] = df[reduced_cols].apply(
    lambda row: ",".join(row.values.astype(str)), axis=1
)

[JovanVeljanoski]

Hey,

Vaex in general does not support the axis argument i believe… so most if not all operations are column oriented (with exception of joins of course).

But there are relatively easy ways to accomplish what you are after. For example, first thing that comes to mind is:

import vaex

df = vaex.example()

# Get all the columns
columns = df.get_column_names()

# Build an expression in a loop
expr = df[columns[0]].astype('string')
for col in columns[1:]:
    expr += df[col].astype('string')

# Assign the expression to the dataframe
df['everything'] = expr

print(df)

[JovanVeljanoski]

Will close due to inactivity. Please reopen if needed