first commit

wp-content/plugins/sitepress-multilingual-cms/classes/database-queries/translated-posts.php

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+<?php
+
+namespace WPML\DatabaseQueries;
+
+class TranslatedPosts {
+	/**
+	 * Returns array of translated content IDs that are related to defined secondary languages.
+	 *
+	 * @param array $langs Array of secondary languages codes to get IDs of translated content for them.
+	 *
+	 * @return array
+	 */
+	public static function getIdsForLangs( $langs ) {
+		global $wpdb;
+		$languagesIn = wpml_prepare_in( $langs );
+
+		$contentIdsQuery = "
+		SELECT posts.ID
+		FROM {$wpdb->posts} posts
+		INNER JOIN {$wpdb->prefix}icl_translations translations ON translations.element_id = posts.ID AND translations.element_type = CONCAT('post_', posts.post_type)
+		WHERE translations.language_code IN ({$languagesIn})
+		";
+
+		return $wpdb->get_col( $contentIdsQuery );
+	}
+}