[BUGS] BUG #14581: invalid cache ID: 41 CONTEXT: parallel worker

The following bug has been logged on the website:

Bug reference:      14581
Logged by:          Stepan Yankevych
Email address:      stepya@ukr.net
PostgreSQL version: 9.6.2
Operating system:   RedHat
Description:

Time to time i have invalid cache ID: 41 while running simple query with
parallelism.
for example 
select count(1) from client_order where date_id =  20170301;
Crashes with (see error log)  

< 2017-03-07 08:57:45.312 EST >ERROR: invalid cache ID: 41 
< 2017-03-07 08:57:45.312 EST >ERROR: invalid cache ID: 41 
< 2017-03-07 08:57:45.312 EST >ERROR: invalid cache ID: 41 
< 2017-03-07 08:57:45.312 EST >ERROR: invalid cache ID: 41 
< 2017-03-07 08:57:45.312 EST >ERROR: invalid cache ID: 41 
< 2017-03-07 08:57:45.312 EST [unknown] SELECT>ERROR: invalid cache ID: 41

< 2017-03-07 08:57:45.312 EST [unknown] SELECT>CONTEXT: parallel worker 
< 2017-03-07 08:57:45.312 EST [unknown] SELECT>STATEMENT: select count(1) 



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