Change record status: 
Project: 
Introduced in branch: 
10.2.x
Introduced in version: 
10.2.0
Description: 

Three new database schema sequence methods are added for PostgreSQL databases.

The next method returns the name for a sequence for a given table name and table column:
$sequence_name = \Drupal::database()->schema()->getSequenceName($table, $column);

The next method return the existance for a given sequence name:
$exists = \Drupal::database()->schema()->sequenceExists($sequence_name);

The next method returns the sequence owner for a given table name a table column.
$owner = \Drupal::database()->schema()->getSequenceOwner($table, $column);

Impacts: 
Module developers