[TomHAnderson]

A ComputedField may give an expression, the DQL of its value. The field then has filters, sort and sortPriority among them, applied to the expression as a field's are applied to its column.

• Every alias in an expression is a {placeholder}, renamed on each use, so two filters, or a filter and a sort, on one field do not collide. {entity} is the root entity. {:name} is the argument name, bound from the filter's args, else its default, else null.
• A sort selects the expression AS HIDDEN and orders by it. The batch id-pair query keeps the hidden selects when it replaces the select; the batch count query applies no sorts (Filter\QueryBuilder::apply() takes $sort).
• Each expression is parsed with Query::getAST(), without a database, after the metadata.build event. Invalid DQL, an alias without a placeholder, an unknown {:name}, an expression on a list or an entity type, and excluded filters without an expression throw Exception\Metadata.
• DQL takes a subquery only for comparisons, so between is applied as two comparisons, and the in, notin, isnull and LIKE filters DQL rejects for an expression are added to its excludeFilters in the metadata.
• excludeFilters and includeFilters on ComputedField limit its filters. The expression and excludeFilters keys are left out of the metadata of a field without them, so Metadata::FORMAT_VERSION is unchanged.

[codecov]

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Additional details and impacted files

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