Exception thrown for merge queries that do not make semantic sense. There are many ways that a merge query could be malformed. They should all

public SelectExtender::preExecute(SelectInterface $query = NULL)

public Condition::conditionGroupFactory($conjunction = 'AND')

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

Flag to indicate if the cleanup function in __destruct() should run. Type: bool File

public SelectExtender::execute() Runs

List of replacement values for use in prefixTables(). Type:

A cache of information about blob columns and sequences of tables. This is collected by

protected Schema::shortenIndex(&$index)

public Connection::getLogger() Gets