6 methods override HandlerBase::query() in Drupal 8

ArgumentPluginBase::query in core/modules/views/src/Plugin/views/argument/ArgumentPluginBase.php

Set up the query for this argument.

FieldPluginBase::query in core/modules/views/src/Plugin/views/field/FieldPluginBase.php

Called to add the field to a query.

FilterPluginBase::query in core/modules/views/src/Plugin/views/filter/FilterPluginBase.php

Add this filter to the query.

RelationshipPluginBase::query in core/modules/views/src/Plugin/views/relationship/RelationshipPluginBase.php

Add anything to the query that we might need to.

Result::query in core/modules/views/src/Plugin/views/area/Result.php

Add anything to the query that we might need to.

SortPluginBase::query in core/modules/views/src/Plugin/views/sort/SortPluginBase.php

Called to add the sort to a query.