Core class used to implement meta queries for the Meta API.

Constructor.

Identify an existing table alias that is compatible with the current query clause.

Return the appropriate alias for the given meta type if applicable.

Get a flattened list of sanitized meta clauses.

Generates SQL clauses to be appended to a main query.

Generate SQL clauses to be appended to a main query.

Generate SQL JOIN and WHERE clauses for a first-order query clause.

Generate SQL clauses for a single query array.

Checks whether the current query has any OR relations.