BaseSqmToSqlAstConverter.java

public abstract class BaseSqmToSqlAstConverter {
  ...

	@Override
	public ComparisonPredicate visitComparisonPredicate(SqmComparisonPredicate predicate) {
		class TypeResolver implements BiFunction<SqmExpression,Supplier<ExpressableType<?>>,ExpressableType<?>> {
			private final SqmExpression otherSide;

			private TypeResolver(SqmExpression otherSide) {
				this.otherSide = otherSide;
			}

			@Override
			public ExpressableType<?> apply(
					SqmExpression sqmExpression,
					Supplier<ExpressableType<?>> fallbackTypeAccess) {
				return otherSide.getExpressableType() == null ? fallbackTypeAccess.get() : otherSide.getExpressableType();
			}
		}

		final Expression lhs;
		final Expression rhs;

		expressableTypeResolverStack.push( new TypeResolver( predicate.getRightHandExpression() ) );
		try {
			lhs = toExpression( predicate.getLeftHandExpression().accept( this ) );
		}
		finally {
			expressableTypeResolverStack.pop();
		}

		expressableTypeResolverStack.push( new TypeResolver( predicate.getLeftHandExpression() ) );
		try {
			rhs = toExpression( predicate.getRightHandExpression().accept( this ) );
		}
		finally {
			expressableTypeResolverStack.pop();
		}

		return new ComparisonPredicate(
				lhs, interpret( predicate.getOperator() ),
				rhs
		);
	}

  ...

	@Override
	public Expression visitNamedParameterExpression(SqmNamedParameter expression) {
		final AllowableParameterType<?> resolvedType = (AllowableParameterType<?>) expressableTypeResolverStack.getCurrent().apply( expression, () -> parameterFallbackType );
    ...
  }
  
  ...
}