public Merge::keys(array $fields, array $values = array())

public Merge::expression($field, $expression, array $arguments = NULL)

Returned by execute() if an UPDATE query has been executed. File core/lib/Drupal/Core/Database/Query/Merge

Returned by execute() if an INSERT query has been executed. File core/lib/Drupal/Core/Database/Query/Merge

public Merge::updateFields(array $fields) Adds

The table or subquery to be used for the condition. File core/lib/Drupal/Core/Database/Query/Merge.php

An array of fields that will be updated. Type:

Flag indicating whether an UPDATE is necessary. Type: bool File

An array of values to be inserted. Type: string File

An array of fields on which to insert. Type: