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Deleted observations being included with read_sas7bdat #307

Description

@fr4nkly82

Describe the issue

When trying to read in a SAS data set that has had observations removed from it using proc sql, those observations are still being displayed when I bring the file into Python using read_sas7bdat.

To Reproduce

/* Run the following code in SAS v9.4: */
libname temp "H:/temp/";

/* Creating a file with deleted observations...*/
data temp.file_with_deleted_obs;
set sashelp.cars;
run;

/* ...by using PROC SQL "delete from" */
proc sql;
delete from temp.file_with_deleted_obs where make='BMW';
quit;

proc contents data=temp.file_with_deleted_obs;
run;
Image
import pyreadstat as py

df, _ = py.read_sas7bdat('H:/temp/file_with_deleted_obs.sas7bdat')
display(df.shape)
df.query('MAKE=="BMW"').reset_index(drop=True)
Image

Expected behavior

df.query('MAKE=="BMW"').reset_index(drop=True)

should return 0 rows, instead it's returning 20.

Setup Information:

How did you install pyreadstat? pip
Platform (windows, macOS, linux, 32 or 64 bit) Windows
Python Version 3.13.5
Python Distribution (System, plain python, Anaconda) miniconda
Using Virtualenv or condaenv? condaenv

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