Package defining support for HQL, including JPQL as a subset of HQL.

Concerns handled by subpackages include:

• query language transformation via ANTLR, and
• query execution via an instance of org.hibernate.query.Query.

Translation of HQL to SQL involves the following steps:

• First, the ANTLR-generated tokenizer and parser work in series to parse the text of the query and produce an AST.
• Next, org.hibernate.query.hql.internal.SemanticQueryBuilder translates the AST into an instance of the SQM (Semantic Query Model) defined in org.hibernate.query.sqm.
• Next, org.hibernate.query.sqm.sql.internal.StandardSqmTranslator transforms the SQM tree and produces a SQL AST, an instance of the syntax tree defined by org.hibernate.sql.ast.tree.
• Finally, a SQL dialect-specific implementation of org.hibernate.sql.ast.SqlAstTranslator produces an executable SQL statement.