Change record status: 
Project: 
Introduced in branch: 
11.2.x
Introduced in version: 
11.2.0
Description: 

The StatementPrefetchIterator::fetchColumn() method is a leftover of earlier times when StatementPrefetchIterator was directly extending \PDOStatement, is called nowhere in core, and has no interface definition nor correspondence in StatementWrapperIterator.

The method is now deprecated.

Use StatementPrefetchIterator::fetchField() instead, which is API and working actually the same.

In core, StatementPrefetchIterator is only used by the database driver for SQLite.

Impacts: 
Module developers