PDOException when filtering on user's language with entity_translation enabled

Problem

PDOException: Integrity constraint violation: 1052 Column 'changed' in field list is ambiguous.

To reproduce:

Content translation
• enable Content translation (translation) module
• enable entity_translation module
• create a Relevant Content Block with
• Display Options -> Order on -> select 'Any date option' OR with Filter Options -> Date Filter -> select 'Yes'
• Filter Options -> Translation -> "Filter on user's language" selected
• view the block

SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'changed' in field list is ambiguous: 

SELECT node.nid AS entity_id, node.vid AS revision_id, node.type AS bundle, node.language AS language, 
	et.language AS et_language, et.status AS et_status, et.translate AS et_translate, :entity_type AS entity_type, 		
CASE node.type WHEN 'page' THEN changed 
			WHEN 'restricted_page' THEN created 
			WHEN 'webform' THEN created 
			WHEN 'building' THEN created 
			WHEN 'channel_event' THEN created 
			WHEN 'channel_news' THEN created 
			WHEN 'mprofile' THEN created 
			WHEN 'media_gallery' THEN created 
			WHEN 'campus' THEN created 
			ELSE '' END 
		AS sort_date
	FROM {node} node 
	LEFT OUTER JOIN {entity_translation} et ON et.entity_type = :base_table 
			AND et.entity_id = node.nid 
			AND et.language = :language 
	WHERE (node.nid <> :db_condition_placeholder_0) 
		AND (node.status = :db_condition_placeholder_1) 
		AND (node.type IN (:db_condition_placeholder_2))
		AND( (node.language = :db_condition_placeholder_3) OR (node.language = :db_condition_placeholder_4) O( (et.language = :db_condition_placeholder_5) 
		AND (et.status = :db_condition_placeholder_6) )) 
	ORDER BY sort_date ASC 
	LIMIT 10 OFFSET 0; 
in EntityFieldQuery->execute() (line 1216 of /srv/wpslabs/drupal7/includes/entity.inc).

This error occurs because both the node and the entity_translation tables have a 'changed' column.

Proposed resolution

Add table name to select fields to avoid ambiguity.