public SelectInterface::preExecute(SelectInterface $query

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::execute() Runs

An array whose elements specify a query to UNION, and the UNION type. The 'type' key may be '', 'ALL', or 'DISTINCT' to represent a 'UNION', 'UNION ALL', or 'UNION DISTINCT'

public Select::leftJoin($table, $alias = NULL, $condition = NULL, $arguments

The table to truncate. Type: string File core/lib/D

Exception thrown if an insert query specifies a field twice. It is not allowed to specify a field as default and insert field, this exception

public QueryConditionTrait::conditionGroupFactory($conjunction

The placeholder counter. File core/lib/Drupal/Core/Database/Query/Query.php, line 52

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