1

Looking at the documentation for QueryConditionInterface::condition(), the default value for $operation is reported to be NULL, while Conditional clauses reports the default value is '='.

What is the default value? Does it change basing on the datatype of $value? For example, when $value is an array, then the default value is 'IN'; when it's a string or an integer, then the default value is '='.

3

QueryConditionInterface is just that, an interface. The actual class used is DatabaseCondition.

In DatabaseCondition:condition(), it does set the default operator:

if (!isset($operator)) {
  if (is_array($value)) {
    $operator = 'IN';
  }
  elseif (!isset($value)) {
    $operator = 'IS NULL';
  }
  else {
    $operator = '=';
  }
}

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